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Solve a Rubik's cube (view source)

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Uses brute-force (width/highscore-first) Fridrich-steps (ie cross,f2l,oll,pll).<br>
Not the fastest (see THRESHOLD) or shortest results (see thistlethwaite) but the code is pretty easy to follow.<br>
The final stage (pll) would probably benefit the most from being replaced with standard algorithms.<br>
While technically this works under pwa/p2js, you should expect a blank screen for nearly 3 minutes.
<lang Phix>--
<!--<lang Phix>(phixonline)-->
-- demo\rosetta\rubik_cfop.exw
<span style="color: #000080;font-style:italic;">--
--
-- demo\rosetta\rubik_cfop.exw
-- Each stage uses a workspace of moves tried so far, ranked by score.
--
-- We repeatedly take the best scoring so far and try more moves, storing
-- thoseEach resultsstage inuses a second/new workspace. Theof THRESHOLDmoves valuetried belowso far, ranked by score.
-- We repeatedly take the best scoring so far and try more moves, storing
-- determines the minimum number we should examine before discarding a
-- those results in a second/new workspace. The THRESHOLD value below
-- workspace and switching to the new (one move longer) one. We only ever
-- determines the minimum number we should examine before discarding a
-- switch on change of score, and obviously the first workspace is empty,
-- workspace and switching to the new (one move longer) one. We only ever
-- and the next new workspace has a maximum of 12 entries (+/-90 by 6),
-- switch on change of score, and obviously the first workspace is empty,
-- both of which will force earlier switches.
-- and the next new workspace has a maximum of 12 entries (+/-90 by 6),
--
-- both of which will force earlier switches.
constant THRESHOLD = 100000 -- 100000 -- very slow (100s), best results
--</span>
-- 10000 -- slow (10s), reasonable results
<span style="color: #008080;">with</span> <span style="color: #008080;">javascript_semantics</span>
-- 1000 -- fast (1s), fairly poor results
<span style="color: #008080;">constant</span> <span style="color: #000000;">THRESHOLD</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">100000</span> <span style="color: #000080;font-style:italic;">-- 100000 -- very slow (100s), best results
-- 100 -- (counter-productive/slower)
-- 10000 -- 10000 -- slow (10s), reasonable results
 
-- 1000 -- fast (1s), fairly poor results
string init ="""
-- 100 -- (counter-productive/slower)</span>
_____________---YYY--------
---YYY--------
<span style="color: #004080;">string</span> <span style="color: #000000;">init</span> <span style="color: #0000FF;">=</span><span style="color: #008000;">"""
---YYY--------
---YYY--------
BBBRRRGGGOOO--
---YYY--------
BBBRRRGGGOOO--
---YYY--------
BBBRRRGGGOOO--
BBBRRRGGGOOO--
------WWW-----
BBBRRRGGGOOO--
------WWW-----
BBBRRRGGGOOO--
------WWW-----
------WWW-----
------WWW-----
"""
------WWW-----
-- numbering:
-- 1..15: ---456--------\n
"""</span>
-- 16..30: ---901--------\n -- U
<span style="color: #000080;font-style:italic;">-- numbering:
-- 31..45: ---456--------\n
-- 461..6015: 678901234567 ---456--------\n
-- 6116..7530: 123456789012---901--------\n -- LFRBU
-- 7631..9045: 678901234567---456--------\n
-- 9146..10560: ------789--- 678901234567--\n
-- 10661..12075:------234--- 123456789012--\n -- DLFRB
-- 12176..13690: 678901234567------789-----\n\n
-- 91..105: ------789-----\n
 
-- 106..120:------234-----\n -- D
if length(init)!=136 then ?9/0 end if
-- 121..136:------789-----\n\n</span>
 
--
<span style="color: #008080;">if</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">init</span><span style="color: #0000FF;">)!=</span><span style="color: #000000;">136</span> <span style="color: #008080;">then</span> <span style="color: #0000FF;">?</span><span style="color: #000000;">9</span><span style="color: #0000FF;">/</span><span style="color: #000000;">0</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
-- TIP: Wrap a cube with blank paper, and write
-- the numbers on it, to derive these sets.
<span style="color: #000080;font-style:italic;">--
--
-- TIP: Wrap a cube with blank paper, and write
constant centres = {20,62,65,68,71,113}
-- the numbers on it, to derive these sets.
 
--</span>
constant edges = {{ 4, 5, 6,57,56,55}, -- ie YYY/OOO
<span style="color: #008080;">constant</span> <span style="color: #000000;">centres</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">20</span><span style="color: #0000FF;">,</span><span style="color: #000000;">62</span><span style="color: #0000FF;">,</span><span style="color: #000000;">65</span><span style="color: #0000FF;">,</span><span style="color: #000000;">68</span><span style="color: #0000FF;">,</span><span style="color: #000000;">71</span><span style="color: #0000FF;">,</span><span style="color: #000000;">113</span><span style="color: #0000FF;">}</span>
{ 6, 21, 36,54,53,52}, -- YYY/GGG
{ 34, 35, 36,49,50,51}, -- YYY/RRR
<span style="color: #008080;">constant</span> <span style="color: #000000;">edges</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{{</span> <span style="color: #000000;">4</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">5</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">6</span><span style="color: #0000FF;">,</span><span style="color: #000000;">57</span><span style="color: #0000FF;">,</span><span style="color: #000000;">56</span><span style="color: #0000FF;">,</span><span style="color: #000000;">55</span><span style="color: #0000FF;">},</span> <span style="color: #000080;font-style:italic;">-- ie YYY/OOO</span>
{ 4, 19, 34,46,47,48}, -- YYY/BBB
<span style="color: #0000FF;">{</span> <span style="color: #000000;">6</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">21</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">36</span><span style="color: #0000FF;">,</span><span style="color: #000000;">54</span><span style="color: #0000FF;">,</span><span style="color: #000000;">53</span><span style="color: #0000FF;">,</span><span style="color: #000000;">52</span><span style="color: #0000FF;">},</span> <span style="color: #000080;font-style:italic;">-- YYY/GGG</span>
{ 51, 66, 81,52,67,82}, -- RRR/GGG
<span style="color: #0000FF;">{</span> <span style="color: #000000;">34</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">35</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">36</span><span style="color: #0000FF;">,</span><span style="color: #000000;">49</span><span style="color: #0000FF;">,</span><span style="color: #000000;">50</span><span style="color: #0000FF;">,</span><span style="color: #000000;">51</span><span style="color: #0000FF;">},</span> <span style="color: #000080;font-style:italic;">-- YYY/RRR</span>
{ 54, 69, 84,55,70,85}, -- GGG/OOO
<span style="color: #0000FF;">{</span> <span style="color: #000000;">4</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">19</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">34</span><span style="color: #0000FF;">,</span><span style="color: #000000;">46</span><span style="color: #0000FF;">,</span><span style="color: #000000;">47</span><span style="color: #0000FF;">,</span><span style="color: #000000;">48</span><span style="color: #0000FF;">},</span> <span style="color: #000080;font-style:italic;">-- YYY/BBB</span>
{ 57, 72, 87,46,61,76}, -- OOO/BBB
<span style="color: #0000FF;">{</span> <span style="color: #000000;">51</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">66</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">81</span><span style="color: #0000FF;">,</span><span style="color: #000000;">52</span><span style="color: #0000FF;">,</span><span style="color: #000000;">67</span><span style="color: #0000FF;">,</span><span style="color: #000000;">82</span><span style="color: #0000FF;">},</span> <span style="color: #000080;font-style:italic;">-- RRR/GGG</span>
{ 48, 63, 78,49,64,79}, -- BBB/RRR
<span style="color: #0000FF;">{</span> <span style="color: #000000;">54</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">69</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">84</span><span style="color: #0000FF;">,</span><span style="color: #000000;">55</span><span style="color: #0000FF;">,</span><span style="color: #000000;">70</span><span style="color: #0000FF;">,</span><span style="color: #000000;">85</span><span style="color: #0000FF;">},</span> <span style="color: #000080;font-style:italic;">-- GGG/OOO</span>
{ 97, 98, 99,82,83,84}, -- WWW/GGG
<span style="color: #0000FF;">{</span> <span style="color: #000000;">57</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">72</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">87</span><span style="color: #0000FF;">,</span><span style="color: #000000;">46</span><span style="color: #0000FF;">,</span><span style="color: #000000;">61</span><span style="color: #0000FF;">,</span><span style="color: #000000;">76</span><span style="color: #0000FF;">},</span> <span style="color: #000080;font-style:italic;">-- OOO/BBB</span>
{ 99,114,129,85,86,87}, -- WWW/OOO
<span style="color: #0000FF;">{</span> <span style="color: #000000;">48</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">63</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">78</span><span style="color: #0000FF;">,</span><span style="color: #000000;">49</span><span style="color: #0000FF;">,</span><span style="color: #000000;">64</span><span style="color: #0000FF;">,</span><span style="color: #000000;">79</span><span style="color: #0000FF;">},</span> <span style="color: #000080;font-style:italic;">-- BBB/RRR</span>
{127,128,129,78,77,76}, -- WWW/BBB
<span style="color: #0000FF;">{</span> <span style="color: #000000;">97</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">98</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">99</span><span style="color: #0000FF;">,</span><span style="color: #000000;">82</span><span style="color: #0000FF;">,</span><span style="color: #000000;">83</span><span style="color: #0000FF;">,</span><span style="color: #000000;">84</span><span style="color: #0000FF;">},</span> <span style="color: #000080;font-style:italic;">-- WWW/GGG</span>
{ 97,112,127,81,80,79}} -- WWW/RRR
<span style="color: #0000FF;">{</span> <span style="color: #000000;">99</span><span style="color: #0000FF;">,</span><span style="color: #000000;">114</span><span style="color: #0000FF;">,</span><span style="color: #000000;">129</span><span style="color: #0000FF;">,</span><span style="color: #000000;">85</span><span style="color: #0000FF;">,</span><span style="color: #000000;">86</span><span style="color: #0000FF;">,</span><span style="color: #000000;">87</span><span style="color: #0000FF;">},</span> <span style="color: #000080;font-style:italic;">-- WWW/OOO</span>
 
<span style="color: #0000FF;">{</span><span style="color: #000000;">127</span><span style="color: #0000FF;">,</span><span style="color: #000000;">128</span><span style="color: #0000FF;">,</span><span style="color: #000000;">129</span><span style="color: #0000FF;">,</span><span style="color: #000000;">78</span><span style="color: #0000FF;">,</span><span style="color: #000000;">77</span><span style="color: #0000FF;">,</span><span style="color: #000000;">76</span><span style="color: #0000FF;">},</span> <span style="color: #000080;font-style:italic;">-- WWW/BBB</span>
constant corners = {{ 4, 57,46},{34,48, 49},{36,51,52},{ 6,54,55},
<span style="color: #0000FF;">{</span> <span style="color: #000000;">97</span><span style="color: #0000FF;">,</span><span style="color: #000000;">112</span><span style="color: #0000FF;">,</span><span style="color: #000000;">127</span><span style="color: #0000FF;">,</span><span style="color: #000000;">81</span><span style="color: #0000FF;">,</span><span style="color: #000000;">80</span><span style="color: #0000FF;">,</span><span style="color: #000000;">79</span><span style="color: #0000FF;">}}</span> <span style="color: #000080;font-style:italic;">-- WWW/RRR</span>
-- YOB/UBL YBR/UFL YRG/UFR YGO/UBL
{76,129,87},{78,79,127},{81,82,97},{84,85,99}}
<span style="color: #008080;">constant</span> <span style="color: #000000;">corners</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{{</span> <span style="color: #000000;">4</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">57</span><span style="color: #0000FF;">,</span><span style="color: #000000;">46</span><span style="color: #0000FF;">},{</span><span style="color: #000000;">34</span><span style="color: #0000FF;">,</span><span style="color: #000000;">48</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">49</span><span style="color: #0000FF;">},{</span><span style="color: #000000;">36</span><span style="color: #0000FF;">,</span><span style="color: #000000;">51</span><span style="color: #0000FF;">,</span><span style="color: #000000;">52</span><span style="color: #0000FF;">},{</span> <span style="color: #000000;">6</span><span style="color: #0000FF;">,</span><span style="color: #000000;">54</span><span style="color: #0000FF;">,</span><span style="color: #000000;">55</span><span style="color: #0000FF;">},</span>
-- BWO/DBL BRW/DFL RGW/DFR GOW/DFL
<span style="color: #000080;font-style:italic;">-- YOB/UBL YBR/UFL YRG/UFR YGO/UBL</span>
 
<span style="color: #0000FF;">{</span><span style="color: #000000;">76</span><span style="color: #0000FF;">,</span><span style="color: #000000;">129</span><span style="color: #0000FF;">,</span><span style="color: #000000;">87</span><span style="color: #0000FF;">},{</span><span style="color: #000000;">78</span><span style="color: #0000FF;">,</span><span style="color: #000000;">79</span><span style="color: #0000FF;">,</span><span style="color: #000000;">127</span><span style="color: #0000FF;">},{</span><span style="color: #000000;">81</span><span style="color: #0000FF;">,</span><span style="color: #000000;">82</span><span style="color: #0000FF;">,</span><span style="color: #000000;">97</span><span style="color: #0000FF;">},{</span><span style="color: #000000;">84</span><span style="color: #0000FF;">,</span><span style="color: #000000;">85</span><span style="color: #0000FF;">,</span><span style="color: #000000;">99</span><span style="color: #0000FF;">}}</span>
constant facing_corners = {-16,-14,16,14}, -- (nb not 14,16)
<span style="color: #000080;font-style:italic;">-- BWO/DBL BRW/DFL RGW/DFR GOW/DFL</span>
facing_edges = {-15, 1,15,-1},
fce = facing_corners&facing_edges,
<span style="color: #008080;">constant</span> <span style="color: #000000;">facing_corners</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{-</span><span style="color: #000000;">16</span><span style="color: #0000FF;">,-</span><span style="color: #000000;">14</span><span style="color: #0000FF;">,</span><span style="color: #000000;">16</span><span style="color: #0000FF;">,</span><span style="color: #000000;">14</span><span style="color: #0000FF;">},</span> <span style="color: #000080;font-style:italic;">-- (nb not 14,16)</span>
rotations = {
<span style="color: #000000;">facing_edges</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{-</span><span style="color: #000000;">15</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #000000;">15</span><span style="color: #0000FF;">,-</span><span style="color: #000000;">1</span><span style="color: #0000FF;">},</span>
-- up (clockwise):
<span style="color: #000000;">fce</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">facing_corners</span><span style="color: #0000FF;">&</span><span style="color: #000000;">facing_edges</span><span style="color: #0000FF;">,</span>
{{57,54,51,48}, -- clockwise corners
<span style="color: #000000;">rotations</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span>
{46,55,52,49}, -- anticlockwise corners
{47,56,53,50}},<span style="color: #000080;font-style:italic;">-- middleup edges(clockwise):</span>
<span style="color: #0000FF;">{{</span><span style="color: #000000;">57</span><span style="color: #0000FF;">,</span><span style="color: #000000;">54</span><span style="color: #0000FF;">,</span><span style="color: #000000;">51</span><span style="color: #0000FF;">,</span><span style="color: #000000;">48</span><span style="color: #0000FF;">},</span> <span style="color: #000080;font-style:italic;">-- clockwise corners</span>
-- left
<span style="color: #0000FF;">{</span><span style="color: #000000;">46</span><span style="color: #0000FF;">,</span><span style="color: #000000;">55</span><span style="color: #0000FF;">,</span><span style="color: #000000;">52</span><span style="color: #0000FF;">,</span><span style="color: #000000;">49</span><span style="color: #0000FF;">},</span> <span style="color: #000080;font-style:italic;">-- anticlockwise corners</span>
{{ 4,49,127, 87},
<span style="color: #0000FF;">{</span><span style="color: #000000;">47</span><span style="color: #0000FF;">,</span><span style="color: #000000;">56</span><span style="color: #0000FF;">,</span><span style="color: #000000;">53</span><span style="color: #0000FF;">,</span><span style="color: #000000;">50</span><span style="color: #0000FF;">}},</span> <span style="color: #000080;font-style:italic;">-- middle edges
{57,34, 79,129},
{19,64,128,-- 72}},left</span>
<span style="color: #0000FF;">{{</span> <span style="color: #000000;">4</span><span style="color: #0000FF;">,</span><span style="color: #000000;">49</span><span style="color: #0000FF;">,</span><span style="color: #000000;">127</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">87</span><span style="color: #0000FF;">},</span>
-- front
<span style="color: #0000FF;">{</span><span style="color: #000000;">57</span><span style="color: #0000FF;">,</span><span style="color: #000000;">34</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">79</span><span style="color: #0000FF;">,</span><span style="color: #000000;">129</span><span style="color: #0000FF;">},</span>
{{34,52, 97, 78},
<span style="color: #0000FF;">{</span><span style="color: #000000;">19</span><span style="color: #0000FF;">,</span><span style="color: #000000;">64</span><span style="color: #0000FF;">,</span><span style="color: #000000;">128</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">72</span><span style="color: #0000FF;">}},</span>
{48,36, 82,127},
{35,67,112,<span 63}},style="color: #000080;font-style:italic;">-- front</span>
<span style="color: #0000FF;">{{</span><span style="color: #000000;">34</span><span style="color: #0000FF;">,</span><span style="color: #000000;">52</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">97</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">78</span><span style="color: #0000FF;">},</span>
-- right
<span style="color: #0000FF;">{</span><span style="color: #000000;">48</span><span style="color: #0000FF;">,</span><span style="color: #000000;">36</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">82</span><span style="color: #0000FF;">,</span><span style="color: #000000;">127</span><span style="color: #0000FF;">},</span>
{{36,55,99,81},
<span style="color: #0000FF;">{</span><span style="color: #000000;">35</span><span style="color: #0000FF;">,</span><span style="color: #000000;">67</span><span style="color: #0000FF;">,</span><span style="color: #000000;">112</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">63</span><span style="color: #0000FF;">}},</span>
{51, 6,85,97},
{21,70,98,66}},<span style="color: #000080;font-style:italic;">-- right</span>
<span style="color: #0000FF;">{{</span><span style="color: #000000;">36</span><span style="color: #0000FF;">,</span><span style="color: #000000;">55</span><span style="color: #0000FF;">,</span><span style="color: #000000;">99</span><span style="color: #0000FF;">,</span><span style="color: #000000;">81</span><span style="color: #0000FF;">},</span>
-- back
<span style="color: #0000FF;">{</span><span style="color: #000000;">51</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">6</span><span style="color: #0000FF;">,</span><span style="color: #000000;">85</span><span style="color: #0000FF;">,</span><span style="color: #000000;">97</span><span style="color: #0000FF;">},</span>
{{ 6,46,129,84},
<span style="color: #0000FF;">{</span><span style="color: #000000;">21</span><span style="color: #0000FF;">,</span><span style="color: #000000;">70</span><span style="color: #0000FF;">,</span><span style="color: #000000;">98</span><span style="color: #0000FF;">,</span><span style="color: #000000;">66</span><span style="color: #0000FF;">}},</span>
{54, 4, 76,99},
{<span 5,61,114,69}},style="color: #000080;font-style:italic;">-- back</span>
<span style="color: #0000FF;">{{</span> <span style="color: #000000;">6</span><span style="color: #0000FF;">,</span><span style="color: #000000;">46</span><span style="color: #0000FF;">,</span><span style="color: #000000;">129</span><span style="color: #0000FF;">,</span><span style="color: #000000;">84</span><span style="color: #0000FF;">},</span>
-- down
<span style="color: #0000FF;">{</span><span style="color: #000000;">54</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">4</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">76</span><span style="color: #0000FF;">,</span><span style="color: #000000;">99</span><span style="color: #0000FF;">},</span>
{{82,85,76,79},
<span style="color: #0000FF;">{</span> <span style="color: #000000;">5</span><span style="color: #0000FF;">,</span><span style="color: #000000;">61</span><span style="color: #0000FF;">,</span><span style="color: #000000;">114</span><span style="color: #0000FF;">,</span><span style="color: #000000;">69</span><span style="color: #0000FF;">}},</span>
{81,84,87,78},
{83,86,77,80}}}<span style="color: #000080;font-style:italic;">-- down</span>
<span style="color: #0000FF;">{{</span><span style="color: #000000;">82</span><span style="color: #0000FF;">,</span><span style="color: #000000;">85</span><span style="color: #0000FF;">,</span><span style="color: #000000;">76</span><span style="color: #0000FF;">,</span><span style="color: #000000;">79</span><span style="color: #0000FF;">},</span>
 
<span style="color: #0000FF;">{</span><span style="color: #000000;">81</span><span style="color: #0000FF;">,</span><span style="color: #000000;">84</span><span style="color: #0000FF;">,</span><span style="color: #000000;">87</span><span style="color: #0000FF;">,</span><span style="color: #000000;">78</span><span style="color: #0000FF;">},</span>
--Up/Left/Front/Right/Back/Down
<span style="color: #0000FF;">{</span><span style="color: #000000;">83</span><span style="color: #0000FF;">,</span><span style="color: #000000;">86</span><span style="color: #0000FF;">,</span><span style="color: #000000;">77</span><span style="color: #0000FF;">,</span><span style="color: #000000;">80</span><span style="color: #0000FF;">}}}</span>
enum U=1,L=2,F=3,/*R=4,*/B=5,D=6,Dbl=#08,Shift=#10
constant U2 = U+Dbl, F2 = F+Dbl, /*R2 = R+Dbl, B2 = B+Dbl,*/ D2 = D+Dbl,
<span style="color: #000080;font-style:italic;">--Up/Left/Front/Right/Back/Down</span>
Us = U+Shift, Fs = F+Shift, Bs = B+Shift, Rs = R+Shift, Ds = D+Shift
<span style="color: #008080;">enum</span> <span style="color: #000000;">U</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #000000;">L</span><span style="color: #0000FF;">=</span><span style="color: #000000;">2</span><span style="color: #0000FF;">,</span><span style="color: #000000;">F</span><span style="color: #0000FF;">=</span><span style="color: #000000;">3</span><span style="color: #0000FF;">,</span><span style="color: #000000;">R</span><span style="color: #0000FF;">=</span><span style="color: #000000;">4</span><span style="color: #0000FF;">,</span><span style="color: #000000;">B</span><span style="color: #0000FF;">=</span><span style="color: #000000;">5</span><span style="color: #0000FF;">,</span><span style="color: #000000;">D</span><span style="color: #0000FF;">=</span><span style="color: #000000;">6</span><span style="color: #0000FF;">,</span><span style="color: #000000;">Dbl</span><span style="color: #0000FF;">=</span><span style="color: #000000;">#08</span><span style="color: #0000FF;">,</span><span style="color: #000000;">Shift</span><span style="color: #0000FF;">=</span><span style="color: #000000;">#10</span>
 
<span style="color: #008080;">constant</span> <span style="color: #000000;">U2</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">U</span><span style="color: #0000FF;">+</span><span style="color: #000000;">Dbl</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">F2</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">F</span><span style="color: #0000FF;">+</span><span style="color: #000000;">Dbl</span><span style="color: #0000FF;">,</span> <span style="color: #000080;font-style:italic;">/*R2 = R+Dbl, B2 = B+Dbl,*/</span> <span style="color: #000000;">D2</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">D</span><span style="color: #0000FF;">+</span><span style="color: #000000;">Dbl</span><span style="color: #0000FF;">,</span>
enum CROSS,F2L,OLL,PLL
<span style="color: #000000;">Us</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">U</span><span style="color: #0000FF;">+</span><span style="color: #000000;">Shift</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">Fs</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">F</span><span style="color: #0000FF;">+</span><span style="color: #000000;">Shift</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">Bs</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">B</span><span style="color: #0000FF;">+</span><span style="color: #000000;">Shift</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">Rs</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">R</span><span style="color: #0000FF;">+</span><span style="color: #000000;">Shift</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">Ds</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">D</span><span style="color: #0000FF;">+</span><span style="color: #000000;">Shift</span>
 
integer f2l = 0 -- (28==done)
<span style="color: #008080;">enum</span> <span style="color: #000000;">CROSS</span><span style="color: #0000FF;">,</span><span style="color: #000000;">F2L</span><span style="color: #0000FF;">,</span><span style="color: #000000;">OLL</span><span style="color: #0000FF;">,</span><span style="color: #000000;">PLL</span>
integer edge_score = 0 -- (0..12 for f2l [as U cleared],
-- 0..24 for oll and pll stages)
<span style="color: #004080;">integer</span> <span style="color: #000000;">f2l</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">0</span> <span style="color: #000080;font-style:italic;">-- (28==done)</span>
 
<span style="color: #004080;">integer</span> <span style="color: #000000;">edge_score</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">0</span> <span style="color: #000080;font-style:italic;">-- (0..12 for f2l [as U cleared],
function score(string cube, integer stage)
-- 0..24 for oll and pll stages)</span>
integer res = 0, c, cc, k
f2l = 0
<span style="color: #008080;">function</span> <span style="color: #000000;">score</span><span style="color: #0000FF;">(</span><span style="color: #004080;">string</span> <span style="color: #000000;">cube</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">integer</span> <span style="color: #000000;">stage</span><span style="color: #0000FF;">)</span>
for i=1 to length(centres) do
<span style="color: #004080;">integer</span> <span style="color: #000000;">res</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">0</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">c</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">cc</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">k</span>
c = centres[i]
<span style="color: #000000;">f2l</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">0</span>
cc = cube[c]
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">centres</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">do</span>
for j=1 to length(fce) do -- (the 8 next to c)
<span style="color: #000000;">c</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">centres</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]</span>
k = c+fce[j]
<span style="color: #000000;">cc</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">c</span><span style="color: #0000FF;">]</span>
if cube[k]=cc then
<span style="color: #008080;">for</span> <span style="color: #000000;">j</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">fce</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">do</span> <span style="color: #000080;font-style:italic;">-- (the 8 next to c)</span>
res += 1
<span style="color: #000000;">k</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">c</span><span style="color: #0000FF;">+</span><span style="color: #000000;">fce</span><span style="color: #0000FF;">[</span><span style="color: #000000;">j</span><span style="color: #0000FF;">]</span>
f2l += (stage>CROSS and k>=61)
<span style="color: #008080;">if</span> <span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">k</span><span style="color: #0000FF;">]=</span><span style="color: #000000;">cc</span> <span style="color: #008080;">then</span>
end if
<span style="color: #000000;">res</span> <span style="color: #0000FF;">+=</span> <span style="color: #000000;">1</span>
end for
<span style="color: #000000;">f2l</span> <span style="color: #0000FF;">+=</span> <span style="color: #0000FF;">(</span><span style="color: #000000;">stage</span><span style="color: #0000FF;">></span><span style="color: #000000;">CROSS</span> <span style="color: #008080;">and</span> <span style="color: #000000;">k</span><span style="color: #0000FF;">>=</span><span style="color: #000000;">61</span><span style="color: #0000FF;">)</span>
end for
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
-- give extra credit for edges paired with corners
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
edge_score = 0 -- += (0|1|2) for the 12 edges:
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
if stage>CROSS then
<span style="color: #000080;font-style:italic;">-- give extra credit for edges paired with corners</span>
for i=1 to length(edges) do
<span style="color: #000000;">edge_score</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">0</span> <span style="color: #000080;font-style:italic;">-- += (0|1|2) for the 12 edges:</span>
sequence ei = edges[i] -- as 123
<span style="color: #008080;">if</span> <span style="color: #000000;">stage</span><span style="color: #0000FF;">></span><span style="color: #000000;">CROSS</span> <span style="color: #008080;">then</span>
-- -- 456
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">edges</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">do</span>
-- then if {1,4}=={2,5} then edge_score += 1,
<span style="color: #004080;">sequence</span> <span style="color: #000000;">ei</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">edges</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]</span> <span style="color: #000080;font-style:italic;">-- as 123
-- plus if {2,5}=={3,6} then edge_score += 1.
-- -- 456
edge_score += (cube[ei[1]]=cube[ei[2]] and
-- then if {1,4}=={2,5} then edge_score += 1, cube[ei[4]]=cube[ei[5]]) +
-- plus if {2,5}=={3,6} then edge_score (cube[ei[2]]+=cube[ei[3]] and1.</span>
<span style="color: #000000;">edge_score</span> <span style="color: #0000FF;">+=</span> <span style="color: #0000FF;">(</span><span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">ei</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]]=</span><span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">ei</span><span style="color: #0000FF;">[</span><span style="color: #000000;">2</span><span style="color: #0000FF;">]]</span> <span style="color: #008080;">and</span>
cube[ei[5]]=cube[ei[6]])
<span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">ei</span><span style="color: #0000FF;">[</span><span style="color: #000000;">4</span><span style="color: #0000FF;">]]=</span><span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">ei</span><span style="color: #0000FF;">[</span><span style="color: #000000;">5</span><span style="color: #0000FF;">]])</span> <span style="color: #0000FF;">+</span>
end for
<span style="color: #0000FF;">(</span><span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">ei</span><span style="color: #0000FF;">[</span><span style="color: #000000;">2</span><span style="color: #0000FF;">]]=</span><span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">ei</span><span style="color: #0000FF;">[</span><span style="color: #000000;">3</span><span style="color: #0000FF;">]]</span> <span style="color: #008080;">and</span>
end if
<span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">ei</span><span style="color: #0000FF;">[</span><span style="color: #000000;">5</span><span style="color: #0000FF;">]]=</span><span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">ei</span><span style="color: #0000FF;">[</span><span style="color: #000000;">6</span><span style="color: #0000FF;">]])</span>
return res
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
end function
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
 
<span style="color: #008080;">return</span> <span style="color: #000000;">res</span>
function oll_score(string cube)
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
-- (should only be invoked if f2l==28)
integer res = 0 -- (true if res=8)
<span style="color: #008080;">function</span> <span style="color: #000000;">oll_score</span><span style="color: #0000FF;">(</span><span style="color: #004080;">string</span> <span style="color: #000000;">cube</span><span style="color: #0000FF;">)</span>
integer cu = centres[U]
<span style="color: #000080;font-style:italic;">-- (should only be invoked if f2l==28)</span>
if cube[cu]!='Y' then ?9/0 end if
<span style="color: #004080;">integer</span> <span style="color: #000000;">res</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">0</span> <span style="color: #000080;font-style:italic;">-- (true if res=8)</span>
for i=1 to length(fce) do
<span style="color: #004080;">integer</span> <span style="color: #000000;">cu</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">centres</span><span style="color: #0000FF;">[</span><span style="color: #000000;">U</span><span style="color: #0000FF;">]</span>
integer fcei = fce[i]
<span style="color: #008080;">if</span> <span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">cu</span><span style="color: #0000FF;">]!=</span><span style="color: #008000;">'Y'</span> <span style="color: #008080;">then</span> <span style="color: #0000FF;">?</span><span style="color: #000000;">9</span><span style="color: #0000FF;">/</span><span style="color: #000000;">0</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
res += (cube[cu+fcei]='Y')
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">fce</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">do</span>
end for
<span style="color: #004080;">integer</span> <span style="color: #000000;">fcei</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">fce</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]</span>
return res
<span style="color: #000000;">res</span> <span style="color: #0000FF;">+=</span> <span style="color: #0000FF;">(</span><span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">cu</span><span style="color: #0000FF;">+</span><span style="color: #000000;">fcei</span><span style="color: #0000FF;">]=</span><span style="color: #008000;">'Y'</span><span style="color: #0000FF;">)</span>
end function
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
 
<span style="color: #008080;">return</span> <span style="color: #000000;">res</span>
function rotate_face(string cube, integer face)
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
--
-- face is 1..6 for clockwise (ULFRBD),
<span style="color: #008080;">function</span> <span style="color: #000000;">rotate_face</span><span style="color: #0000FF;">(</span><span style="color: #004080;">string</span> <span style="color: #000000;">cube</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">integer</span> <span style="color: #000000;">face</span><span style="color: #0000FF;">)</span>
-- plus #08(Dbl) for a 180 (clockwise),
<span style="color: #000080;font-style:italic;">--
-- plus #10(Shift) for anti-clockwise.
-- face is 1..6 for clockwise (ULFRBD),
--
-- plus #08(Dbl) for a 180 (clockwise),
integer dbl = 1+(and_bits(face,Dbl)=Dbl)
-- plus #10(Shift) for anti-clockwise.
bool cw = 1-floor(face/Shift)
--</span>
face = remainder(face,Dbl)
<span style="color: #004080;">integer</span> <span style="color: #000000;">dbl</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">1</span><span style="color: #0000FF;">+(</span><span style="color: #7060A8;">and_bits</span><span style="color: #0000FF;">(</span><span style="color: #000000;">face</span><span style="color: #0000FF;">,</span><span style="color: #000000;">Dbl</span><span style="color: #0000FF;">)=</span><span style="color: #000000;">Dbl</span><span style="color: #0000FF;">)</span>
integer cf = centres[face]
<span style="color: #004080;">bool</span> <span style="color: #000000;">cw</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">1</span><span style="color: #0000FF;">-</span><span style="color: #7060A8;">floor</span><span style="color: #0000FF;">(</span><span style="color: #000000;">face</span><span style="color: #0000FF;">/</span><span style="color: #000000;">Shift</span><span style="color: #0000FF;">)</span>
sequence rf = {sq_add(facing_corners,cf),
<span style="color: #000000;">face</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">remainder</span><span style="color: #0000FF;">(</span><span style="color: #000000;">face</span><span style="color: #0000FF;">,</span><span style="color: #000000;">Dbl</span><span style="color: #0000FF;">)</span>
sq_add(facing_edges,cf)}
<span style="color: #004080;">integer</span> <span style="color: #000000;">cf</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">centres</span><span style="color: #0000FF;">[</span><span style="color: #000000;">face</span><span style="color: #0000FF;">]</span>
&rotations[face]
<span style="color: #004080;">sequence</span> <span style="color: #000000;">rf</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span><span style="color: #7060A8;">sq_add</span><span style="color: #0000FF;">(</span><span style="color: #000000;">facing_corners</span><span style="color: #0000FF;">,</span><span style="color: #000000;">cf</span><span style="color: #0000FF;">),</span>
for d=1 to dbl do
<span style="color: #7060A8;">sq_add</span><span style="color: #0000FF;">(</span><span style="color: #000000;">facing_edges</span><span style="color: #0000FF;">,</span><span style="color: #000000;">cf</span><span style="color: #0000FF;">)}</span>
for i=1 to length(rf) do
<span style="color: #0000FF;">&</span><span style="color: #000000;">rotations</span><span style="color: #0000FF;">[</span><span style="color: #000000;">face</span><span style="color: #0000FF;">]</span>
sequence rfi = rf[i]
<span style="color: #008080;">for</span> <span style="color: #000000;">d</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #000000;">dbl</span> <span style="color: #008080;">do</span>
if cw then rfi = reverse(rfi) end if
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">rf</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">do</span>
integer rfi1 = cube[rfi[1]]
<span style="color: #004080;">sequence</span> <span style="color: #000000;">rfi</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">rf</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]</span>
for j=1 to 3 do
<span style="color: #008080;">if</span> <span style="color: #000000;">cw</span> <span style="color: #008080;">then</span> <span style="color: #000000;">rfi</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">reverse</span><span style="color: #0000FF;">(</span><span style="color: #000000;">rfi</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
cube[rfi[j]] = cube[rfi[j+1]]
<span style="color: #004080;">integer</span> <span style="color: #000000;">rfi1</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">rfi</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]]</span>
end for
<span style="color: #008080;">for</span> <span style="color: #000000;">j</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #000000;">3</span> <span style="color: #008080;">do</span>
cube[rfi[4]] = rfi1
<span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">rfi</span><span style="color: #0000FF;">[</span><span style="color: #000000;">j</span><span style="color: #0000FF;">]]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">rfi</span><span style="color: #0000FF;">[</span><span style="color: #000000;">j</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]]</span>
end for
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
end for
<span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">rfi</span><span style="color: #0000FF;">[</span><span style="color: #000000;">4</span><span style="color: #0000FF;">]]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">rfi1</span>
return cube
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
end function
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
 
<span style="color: #008080;">return</span> <span style="color: #000000;">cube</span>
function apply_moves(string cube, sequence moves)
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
for i=1 to length(moves) do
cube = rotate_face(cube,moves[i])
<span style="color: #008080;">function</span> <span style="color: #000000;">apply_moves</span><span style="color: #0000FF;">(</span><span style="color: #004080;">string</span> <span style="color: #000000;">cube</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">sequence</span> <span style="color: #000000;">moves</span><span style="color: #0000FF;">)</span>
end for
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">moves</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">do</span>
return cube
<span style="color: #000000;">cube</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">rotate_face</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cube</span><span style="color: #0000FF;">,</span><span style="color: #000000;">moves</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">])</span>
end function
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
 
<span style="color: #008080;">return</span> <span style="color: #000000;">cube</span>
constant ULFRBD = "ULFRBD"
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
 
function moves_to_string(sequence moves)
<span style="color: #008080;">constant</span> <span style="color: #000000;">ULFRBD</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">"ULFRBD"</span>
-- convert eg {1,20,11} to "UR'F2"
string res = ""
<span style="color: #008080;">function</span> <span style="color: #000000;">moves_to_string</span><span style="color: #0000FF;">(</span><span style="color: #004080;">sequence</span> <span style="color: #000000;">moves</span><span style="color: #0000FF;">)</span>
integer l = length(moves)
<span style="color: #000080;font-style:italic;">-- convert eg {1,20,11} to "UR'F2"</span>
for i=1 to l do
<span style="color: #004080;">string</span> <span style="color: #000000;">res</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">""</span>
integer face = moves[i]
<span style="color: #004080;">integer</span> <span style="color: #000000;">l</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">moves</span><span style="color: #0000FF;">)</span>
integer dbl = and_bits(face,Dbl)=Dbl
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #000000;">l</span> <span style="color: #008080;">do</span>
bool anticw = floor(face/Shift)
<span style="color: #004080;">integer</span> <span style="color: #000000;">face</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">moves</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]</span>
face = remainder(face,Dbl)
<span style="color: #004080;">integer</span> <span style="color: #000000;">dbl</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">and_bits</span><span style="color: #0000FF;">(</span><span style="color: #000000;">face</span><span style="color: #0000FF;">,</span><span style="color: #000000;">Dbl</span><span style="color: #0000FF;">)=</span><span style="color: #000000;">Dbl</span>
res &= ULFRBD[face]
<span style="color: #004080;">bool</span> <span style="color: #000000;">anticw</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">floor</span><span style="color: #0000FF;">(</span><span style="color: #000000;">face</span><span style="color: #0000FF;">/</span><span style="color: #000000;">Shift</span><span style="color: #0000FF;">)</span>
if dbl then
<span style="color: #000000;">face</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">remainder</span><span style="color: #0000FF;">(</span><span style="color: #000000;">face</span><span style="color: #0000FF;">,</span><span style="color: #000000;">Dbl</span><span style="color: #0000FF;">)</span>
res &= '2'
<span style="color: #000000;">res</span> <span style="color: #0000FF;">&=</span> <span style="color: #000000;">ULFRBD</span><span style="color: #0000FF;">[</span><span style="color: #000000;">face</span><span style="color: #0000FF;">]</span>
elsif anticw then
<span style="color: #008080;">if</span> <span style="color: #000000;">dbl</span> <span style="color: #008080;">then</span>
res &= '\''
<span style="color: #000000;">res</span> <span style="color: #0000FF;">&=</span> <span style="color: #008000;">'2'</span>
end if
<span style="color: #008080;">elsif</span> <span style="color: #000000;">anticw</span> <span style="color: #008080;">then</span>
end for
<span style="color: #000000;">res</span> <span style="color: #0000FF;">&=</span> <span style="color: #008000;"><nowiki>'\''</nowiki></span>
res &=sprintf(" (%d move%s) ",{l,iff(l=1?"":"s")})
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
return res
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
end function
<span style="color: #000000;">res</span> <span style="color: #0000FF;">&=</span><span style="color: #7060A8;">sprintf</span><span style="color: #0000FF;">(</span><span style="color: #008000;">" (%d move%s) "</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">l</span><span style="color: #0000FF;">,</span><span style="color: #008080;">iff</span><span style="color: #0000FF;">(</span><span style="color: #000000;">l</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span><span style="color: #0000FF;">?</span><span style="color: #008000;">""</span><span style="color: #0000FF;">:</span><span style="color: #008000;">"s"</span><span style="color: #0000FF;">)})</span>
<span style="color: #008080;">return</span> <span style="color: #000000;">res</span>
--
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
-- The seen dictionary.
-- Without this, since it uses a breadth/highscore-first
<span style="color: #000080;font-style:italic;">--
-- algorithm, after f2l (for instance) it would probably
-- The seen dictionary.
-- just do U and U' as the new high scores, forever.
-- Without this, since it uses a breadth/highscore-first
-- (The THRESHOLD constant mitigates that to some extent)
-- algorithm, after f2l (for instance) it would probably
--
-- just do U and U' as the new high scores, forever.
integer seen = new_dict()
-- (The THRESHOLD constant mitigates that to some extent)
 
--</span>
function solve_stage(string cube, integer stage)
<span style="color: #004080;">integer</span> <span style="color: #000000;">seen</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">new_dict</span><span style="color: #0000FF;">()</span>
atom t1 = time()+1
string moves = "", moves2
<span style="color: #008080;">function</span> <span style="color: #000000;">solve_stage</span><span style="color: #0000FF;">(</span><span style="color: #004080;">string</span> <span style="color: #000000;">cube</span><span style="color: #0000FF;">,</span> <span style="color: #004080;">integer</span> <span style="color: #000000;">stage</span><span style="color: #0000FF;">)</span>
sequence workspace, w2,
<span style="color: #004080;">atom</span> <span style="color: #000000;">t1</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">time</span><span style="color: #0000FF;">()+</span><span style="color: #000000;">1</span>
init
<span style="color: #004080;">string</span> <span style="color: #000000;">moves</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">""</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">moves2</span>
integer wslen, high = 1,
<span style="color: #004080;">sequence</span> <span style="color: #000000;">workspace</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">w2</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">init</span>
s, c2c = 0, o = 0
<span style="color: #004080;">integer</span> <span style="color: #000000;">wslen</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">high</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">1</span><span style="color: #0000FF;">,</span>
bool done
<span style="color: #000000;">s</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">c2c</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">0</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">o</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">0</span>
 
<span style="color: #004080;">bool</span> <span style="color: #000000;">done</span>
if stage=CROSS then
--
<span style="color: #008080;">if</span> <span style="color: #000000;">stage</span><span style="color: #0000FF;">=</span><span style="color: #000000;">CROSS</span> <span style="color: #008080;">then</span>
-- first, blank out all corners, and
<span style="color: #000080;font-style:italic;">--
-- all edges without a white on them.
-- first, blank out all corners, and
-- all edges without a white on them.
for i=1 to length(rotations) do
for j=1 to 2 do -- (just corners)</span>
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">rotations</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">do</span>
for k=1 to 4 do
<span style="color: #008080;">for</span> <span style="color: #000000;">j</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #000000;">2</span> <span style="color: #008080;">do</span> <span style="color: #000080;font-style:italic;">-- (just corners)</span>
cube[rotations[i][j][k]]='-'
<span style="color: #008080;">for</span> <span style="color: #000000;">k</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #000000;">4</span> <span style="color: #008080;">do</span>
end for
<span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">rotations</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">][</span><span style="color: #000000;">j</span><span style="color: #0000FF;">][</span><span style="color: #000000;">k</span><span style="color: #0000FF;">]]=</span><span style="color: #008000;">'-'</span>
end for
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
end for
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
for i=1 to length(edges) do
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
integer {?,m1,?,?,m2,?} = edges[i]
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">edges</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">do</span>
if cube[m1]!='W'
<span style="color: #004080;">integer</span> <span style="color: #0000FF;">{?,</span><span style="color: #000000;">m1</span><span style="color: #0000FF;">,?,?,</span><span style="color: #000000;">m2</span><span style="color: #0000FF;">,?}</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">edges</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]</span>
and cube[m2]!='W' then
<span style="color: #008080;">if</span> <span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">m1</span><span style="color: #0000FF;">]!=</span><span style="color: #008000;">'W'</span>
cube[m1] = '-'
<span style="color: #008080;">and</span> <span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">m2</span><span style="color: #0000FF;">]!=</span><span style="color: #008000;">'W'</span> <span style="color: #008080;">then</span>
cube[m2] = '-'
<span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">m1</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">'-'</span>
end if
<span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">m2</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">'-'</span>
end for
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
wslen = 8
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
s = score(cube,CROSS)
<span style="color: #000000;">wslen</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">8</span>
done = (s=8)
<span style="color: #000000;">s</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">score</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cube</span><span style="color: #0000FF;">,</span><span style="color: #000000;">CROSS</span><span style="color: #0000FF;">)</span>
elsif stage=F2L then
<span style="color: #000000;">done</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">(</span><span style="color: #000000;">s</span><span style="color: #0000FF;">=</span><span style="color: #000000;">8</span><span style="color: #0000FF;">)</span>
--
<span style="color: #008080;">elsif</span> <span style="color: #000000;">stage</span><span style="color: #0000FF;">=</span><span style="color: #000000;">F2L</span> <span style="color: #008080;">then</span>
-- first, blank out all pieces with a yellow
<span style="color: #000080;font-style:italic;">--
--
-- first, blank out all pieces with a yellow
for i=1 to length(corners) do
integer {c1,c2,c3} = corners[i]--</span>
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">corners</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">do</span>
if cube[c1]='Y'
<span style="color: #004080;">integer</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">c1</span><span style="color: #0000FF;">,</span><span style="color: #000000;">c2</span><span style="color: #0000FF;">,</span><span style="color: #000000;">c3</span><span style="color: #0000FF;">}</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">corners</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]</span>
or cube[c2]='Y'
<span style="color: #008080;">if</span> <span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">c1</span><span style="color: #0000FF;">]=</span><span style="color: #008000;">'Y'</span>
or cube[c3]='Y' then
<span style="color: #008080;">or</span> <span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">c2</span><span style="color: #0000FF;">]=</span><span style="color: #008000;">'Y'</span>
cube[c1] = '-'
<span style="color: #008080;">or</span> <span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">c3</span><span style="color: #0000FF;">]=</span><span style="color: #008000;">'Y'</span> <span style="color: #008080;">then</span>
cube[c2] = '-'
<span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">c1</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">'-'</span>
cube[c3] = '-'
<span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">c2</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">'-'</span>
end if
<span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">c3</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">'-'</span>
end for
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
for i=1 to length(edges) do
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
integer {?,m1,?,?,m2,?} = edges[i]
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">edges</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">do</span>
if cube[m1]='Y'
<span style="color: #004080;">integer</span> <span style="color: #0000FF;">{?,</span><span style="color: #000000;">m1</span><span style="color: #0000FF;">,?,?,</span><span style="color: #000000;">m2</span><span style="color: #0000FF;">,?}</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">edges</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]</span>
and cube[m2]='Y' then
<span style="color: #008080;">if</span> <span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">m1</span><span style="color: #0000FF;">]=</span><span style="color: #008000;">'Y'</span>
cube[m1] = '-'
<span style="color: #008080;">and</span> <span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">m2</span><span style="color: #0000FF;">]=</span><span style="color: #008000;">'Y'</span> <span style="color: #008080;">then</span>
cube[m2] = '-'
<span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">m1</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">'-'</span>
end if
<span style="color: #000000;">cube</span><span style="color: #0000FF;">[</span><span style="color: #000000;">m2</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">'-'</span>
end for
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
wslen = 57+12
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
s = score(cube,F2L)
<span style="color: #000000;">wslen</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">57</span><span style="color: #0000FF;">+</span><span style="color: #000000;">12</span>
done = (f2l=28)
<span style="color: #000000;">s</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">score</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cube</span><span style="color: #0000FF;">,</span><span style="color: #000000;">F2L</span><span style="color: #0000FF;">)</span>
else
<span style="color: #000000;">done</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">(</span><span style="color: #000000;">f2l</span><span style="color: #0000FF;">=</span><span style="color: #000000;">28</span><span style="color: #0000FF;">)</span>
wslen = 77+24
<span style="color: #008080;">else</span>
s = score(cube,stage)
<span style="color: #000000;">wslen</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">77</span><span style="color: #0000FF;">+</span><span style="color: #000000;">24</span>
if f2l!=28 then ?9/0 end if
<span style="color: #000000;">s</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">score</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cube</span><span style="color: #0000FF;">,</span><span style="color: #000000;">stage</span><span style="color: #0000FF;">)</span>
if stage=OLL then
<span style="color: #008080;">if</span> <span style="color: #000000;">f2l</span><span style="color: #0000FF;">!=</span><span style="color: #000000;">28</span> <span style="color: #008080;">then</span> <span style="color: #0000FF;">?</span><span style="color: #000000;">9</span><span style="color: #0000FF;">/</span><span style="color: #000000;">0</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
done = (oll_score(cube)=8)
<span style="color: #008080;">if</span> <span style="color: #000000;">stage</span><span style="color: #0000FF;">=</span><span style="color: #000000;">OLL</span> <span style="color: #008080;">then</span>
else -- (stage=PLL)
<span style="color: #000000;">done</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">(</span><span style="color: #000000;">oll_score</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cube</span><span style="color: #0000FF;">)=</span><span style="color: #000000;">8</span><span style="color: #0000FF;">)</span>
done = (s=48)
<span style="color: #008080;">else</span> <span style="color: #000080;font-style:italic;">-- (stage=PLL)</span>
end if
<span style="color: #000000;">done</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">(</span><span style="color: #000000;">s</span><span style="color: #0000FF;">=</span><span style="color: #000000;">48</span><span style="color: #0000FF;">)</span>
end if
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
if not done then
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
workspace = repeat({},wslen)
<span style="color: #008080;">if</span> <span style="color: #008080;">not</span> <span style="color: #000000;">done</span> <span style="color: #008080;">then</span>
w2 = workspace
<span style="color: #000000;">workspace</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">repeat</span><span style="color: #0000FF;">({},</span><span style="color: #000000;">wslen</span><span style="color: #0000FF;">)</span>
init = cube
<span style="color: #000000;">w2</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">deep_copy</span><span style="color: #0000FF;">(</span><span style="color: #000000;">workspace</span><span style="color: #0000FF;">)</span>
workspace[high] = {""}
<span style="color: #000000;">init</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">cube</span>
destroy_dict(seen,justclear:=1)
<span style="color: #000000;">workspace</span><span style="color: #0000FF;">[</span><span style="color: #000000;">high</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span><span style="color: #008000;">""</span><span style="color: #0000FF;">}</span>
integer move_count = 1
<span style="color: #7060A8;">destroy_dict</span><span style="color: #0000FF;">(</span><span style="color: #000000;">seen</span><span style="color: #0000FF;">,</span><span style="color: #000000;">justclear</span><span style="color: #0000FF;">:=</span><span style="color: #000000;">1</span><span style="color: #0000FF;">)</span>
while 1 do
<span style="color: #004080;">integer</span> <span style="color: #000000;">move_count</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">1</span>
if workspace[high]={} then
<span style="color: #008080;">while</span> <span style="color: #000000;">1</span> <span style="color: #008080;">do</span>
while high and workspace[high]={} do high -= 1 end while
<span style="color: #008080;">if</span> <span style="color: #000000;">workspace</span><span style="color: #0000FF;">[</span><span style="color: #000000;">high</span><span style="color: #0000FF;">]={}</span> <span style="color: #008080;">then</span>
if high=0 or (stage!=CROSS and c2c>THRESHOLD) then
<span style="color: #008080;">while</span> <span style="color: #000000;">high</span> <span style="color: #008080;">and</span> <span style="color: #000000;">workspace</span><span style="color: #0000FF;">[</span><span style="color: #000000;">high</span><span style="color: #0000FF;">]={}</span> <span style="color: #008080;">do</span> <span style="color: #000000;">high</span> <span style="color: #0000FF;">-=</span> <span style="color: #000000;">1</span> <span style="color: #008080;">end</span> <span style="color: #008080;">while</span>
move_count += 1
<span style="color: #008080;">if</span> <span style="color: #000000;">high</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span> <span style="color: #008080;">or</span> <span style="color: #0000FF;">(</span><span style="color: #000000;">stage</span><span style="color: #0000FF;">!=</span><span style="color: #000000;">CROSS</span> <span style="color: #008080;">and</span> <span style="color: #000000;">c2c</span><span style="color: #0000FF;">></span><span style="color: #000000;">THRESHOLD</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">then</span>
workspace = w2
<span style="color: #000000;">move_count</span> <span style="color: #0000FF;">+=</span> <span style="color: #000000;">1</span>
w2 = repeat({},wslen)
<span style="color: #000000;">workspace</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">w2</span>
c2c = 0
<span style="color: #000000;">w2</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">repeat</span><span style="color: #0000FF;">({},</span><span style="color: #000000;">wslen</span><span style="color: #0000FF;">)</span>
high = wslen
<span style="color: #000000;">c2c</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">0</span>
while workspace[high]={} do high -= 1 end while
<span style="color: #000000;">high</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">wslen</span>
end if
<span style="color: #008080;">while</span> <span style="color: #000000;">workspace</span><span style="color: #0000FF;">[</span><span style="color: #000000;">high</span><span style="color: #0000FF;">]={}</span> <span style="color: #008080;">do</span> <span style="color: #000000;">high</span> <span style="color: #0000FF;">-=</span> <span style="color: #000000;">1</span> <span style="color: #008080;">end</span> <span style="color: #008080;">while</span>
end if
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
moves = workspace[high][1]
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
workspace[high] = workspace[high][2..$]
<span style="color: #000000;">moves</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">workspace</span><span style="color: #0000FF;">[</span><span style="color: #000000;">high</span><span style="color: #0000FF;">][</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span>
cube = apply_moves(init,moves)
<span style="color: #000000;">workspace</span><span style="color: #0000FF;">[</span><span style="color: #000000;">high</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">workspace</span><span style="color: #0000FF;">[</span><span style="color: #000000;">high</span><span style="color: #0000FF;">][</span><span style="color: #000000;">2</span><span style="color: #0000FF;">..$]</span>
for face=U to D do
<span style="color: #000000;">cube</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">apply_moves</span><span style="color: #0000FF;">(</span><span style="color: #000000;">init</span><span style="color: #0000FF;">,</span><span style="color: #000000;">moves</span><span style="color: #0000FF;">)</span>
-- (originally this loop did 180s as well, but that
<span style="color: #008080;">for</span> <span style="color: #000000;">face</span><span style="color: #0000FF;">=</span><span style="color: #000000;">U</span> <span style="color: #008080;">to</span> <span style="color: #000000;">D</span> <span style="color: #008080;">do</span>
-- gave them far too much dominance, esp during pll.
<span style="color: #000080;font-style:italic;">-- (originally insteadthis weloop nowdid coalese180s thoseas thatwell, survivebut a 90.)that
for m=0-- to Shiftgave bythem Shiftfar dotoo much dominance, esp during pll.
-- instead integerwe minow =coalese face+mthose that survive a 90.)</span>
<span style="color: #008080;">for</span> <span style="color: #000000;">m</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span> <span style="color: #008080;">to</span> <span style="color: #000000;">Shift</span> <span style="color: #008080;">by</span> <span style="color: #000000;">Shift</span> <span style="color: #008080;">do</span>
sequence cube2 = rotate_face(cube,mi)
<span style="color: #004080;">integer</span> <span style="color: #000000;">mi</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">face</span><span style="color: #0000FF;">+</span><span style="color: #000000;">m</span>
if getd_index(cube2,seen)=0 then
<span style="color: #004080;">sequence</span> <span style="color: #000000;">cube2</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">rotate_face</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cube</span><span style="color: #0000FF;">,</span><span style="color: #000000;">mi</span><span style="color: #0000FF;">)</span>
putd(cube2,0,seen)
<span style="color: #008080;">if</span> <span style="color: #7060A8;">getd_index</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cube2</span><span style="color: #0000FF;">,</span><span style="color: #000000;">seen</span><span style="color: #0000FF;">)=</span><span style="color: #000000;">0</span> <span style="color: #008080;">then</span>
s = score(cube2,stage)
<span style="color: #7060A8;">putd</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cube2</span><span style="color: #0000FF;">,</span><span style="color: #000000;">0</span><span style="color: #0000FF;">,</span><span style="color: #000000;">seen</span><span style="color: #0000FF;">)</span>
if stage=CROSS then
<span style="color: #000000;">s</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">score</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cube2</span><span style="color: #0000FF;">,</span><span style="color: #000000;">stage</span><span style="color: #0000FF;">)</span>
done = (s=8)
<span style="color: #008080;">if</span> <span style="color: #000000;">stage</span><span style="color: #0000FF;">=</span><span style="color: #000000;">CROSS</span> <span style="color: #008080;">then</span>
elsif stage=F2L then
<span style="color: #000000;">done</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">(</span><span style="color: #000000;">s</span><span style="color: #0000FF;">=</span><span style="color: #000000;">8</span><span style="color: #0000FF;">)</span>
done = (f2l=28)
<span style="color: #008080;">elsif</span> <span style="color: #000000;">stage</span><span style="color: #0000FF;">=</span><span style="color: #000000;">F2L</span> <span style="color: #008080;">then</span>
else
<span style="color: #000000;">done</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">(</span><span style="color: #000000;">f2l</span><span style="color: #0000FF;">=</span><span style="color: #000000;">28</span><span style="color: #0000FF;">)</span>
if f2l=28 then
<span o style="color: oll_score(cube2)#008080;">else</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">f2l</span><span style="color: #0000FF;">=</span><span style="color: #000000;">28</span> <span style="color: #008080;">then</span>
else
<span style="color: #000000;">o</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">oll_score</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cube2</span><span style="color: #0000FF;">)</span>
o = 0
end if<span style="color: #008080;">else</span>
if stage <span style="color: #000000;">o</span> <span style="color: #0000FF;">=</span> <span style=OLL"color: then#000000;">0</span>
<span style="color: #008080;">end</span> done<span style="color: (o=8)#008080;">if</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">stage</span><span style="color: #0000FF;">=</span><span style="color: #000000;">OLL</span> <span style="color: #008080;">then</span>
else
<span style="color: #000000;">done</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">(</span><span style="color: #000000;">o</span><span style="color: #0000FF;">=</span><span style="color: #000000;">8</span><span style="color: #0000FF;">)</span>
done = (s=48)
end if<span style="color: #008080;">else</span>
<span style="color: #000000;">done</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">(</span><span style="color: #000000;">s</span><span style="color: #0000FF;">=</span><span style="color: #000000;">48</span><span style="color: #0000FF;">)</span>
end if
moves2 <span style="color: #008080;">end</span> <span style="color: moves#008080;">if</span>
if length(moves2)<span andstyle="color: moves2[$]#008080;">end</span> <span style=mi"color: then#008080;">if</span>
<span style="color: #000000;">moves2[$]</span> <span style="color: #0000FF;">=</span> <span style="color: face+Dbl#000000;">moves</span>
<span style="color: #008080;">if</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">moves2</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">and</span> <span style="color: #000000;">moves2</span><span style="color: #0000FF;">[$]=</span><span style="color: #000000;">mi</span> <span style="color: #008080;">then</span>
else
<span style="color: #000000;">moves2</span><span style="color: #0000FF;">[$]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">face</span><span style="color: #0000FF;">+</span><span style="color: #000000;">Dbl</span>
moves2 &= mi
end if<span style="color: #008080;">else</span>
<span style="color: #000000;">moves2</span> <span style="color: #0000FF;">&=</span> <span style="color: #000000;">mi</span>
if done then
<span style="color: #008080;">end</span> destroy_dict(seen,justclear:<span style=1)"color: #008080;">if</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">done</span> <span style="color: #008080;">then</span>
return moves2
<span style="color: #7060A8;">destroy_dict</span><span style="color: #0000FF;">(</span><span style="color: #000000;">seen</span><span style="color: #0000FF;">,</span><span style="color: #000000;">justclear</span><span style="color: #0000FF;">:=</span><span style="color: #000000;">1</span><span style="color: #0000FF;">)</span>
end if
s + <span style="color: #008080;">return</span> <span style="color: 1+edge_score*2+o#000000;">moves2</span>
w2[s] <span style="color: #008080;">end</span> <span style="color: append(w2[s],moves2)#008080;">if</span>
<span style="color: #000000;">s</span> <span style="color: #0000FF;">+=</span> <span style="color: #000000;">1</span><span style="color: #0000FF;">+</span><span style="color: #000000;">edge_score</span><span style="color: #0000FF;">*</span><span style="color: #000000;">2</span><span style="color: #0000FF;">+</span><span style="color: #000000;">o</span>
c2c += 1
<span style="color: #000000;">w2</span><span style="color: #0000FF;">[</span><span style="color: #000000;">s</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">append</span><span style="color: #0000FF;">(</span><span style="color: #000000;">w2</span><span style="color: #0000FF;">[</span><span style="color: #000000;">s</span><span style="color: #0000FF;">],</span><span style="color: #000000;">moves2</span><span style="color: #0000FF;">)</span>
end if
<span style="color: #000000;">c2c</span> <span style="color: #0000FF;">+=</span> <span style="color: #000000;">1</span>
end for
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
end for
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
if time()>t1 then
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
printf(1,"working... %d moves, %d positions\r",{move_count,dict_size(seen)})
<span style="color: #008080;">if</span> <span style="color: #7060A8;">time</span><span style="color: #0000FF;">()></span><span style="color: #000000;">t1</span> <span style="color: #008080;">and</span> <span style="color: #7060A8;">platform</span><span style="color: #0000FF;">()!=</span><span style="color: #004600;">JS</span> <span style="color: #008080;">then</span>
t1 = time()+1
<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"working... %d moves, %d positions\r"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">move_count</span><span style="color: #0000FF;">,</span><span style="color: #7060A8;">dict_size</span><span style="color: #0000FF;">(</span><span style="color: #000000;">seen</span><span style="color: #0000FF;">)})</span>
if get_key()=#1B then exit end if
<span style="color: #000000;">t1</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">time</span><span style="color: #0000FF;">()+</span><span style="color: #000000;">1</span>
end if
<span style="color: #008080;">if</span> <span style="color: #7060A8;">get_key</span><span style="color: #0000FF;">()=</span><span style="color: #000000;">#1B</span> <span style="color: #008080;">then</span> <span style="color: #008080;">exit</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
end while
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
end if
<span style="color: #008080;">end</span> <span style="color: #008080;">while</span>
return "" -- (already solved case)
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
end function
<span style="color: #008080;">return</span> <span style="color: #008000;">""</span> <span style="color: #000080;font-style:italic;">-- (already solved case)</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
constant stage_desc = { "make cross",
"solve first two layers",
<span style="color: #008080;">constant</span> <span style="color: #000000;">stage_desc</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span> <span style="color: #008000;">"make cross"</span><span style="color: #0000FF;">,</span>
"orientate last layer",
<span style="permutecolor: last#008000;">"solve layerfirst two layers"</span><span }style="color: #0000FF;">,</span>
<span style="color: #008000;">"orientate last layer"</span><span style="color: #0000FF;">,</span>
 
<span style="color: #008000;">"permute last layer"</span> <span style="color: #0000FF;">}</span>
procedure main()
string cube
<span style="color: #008080;">procedure</span> <span style="color: #000000;">main</span><span style="color: #0000FF;">()</span>
sequence moves
<span style="color: #004080;">string</span> <span style="color: #000000;">cube</span>
integer total_moves = 0
<span style="color: #004080;">sequence</span> <span style="color: #000000;">moves</span>
atom t0 = time()
<span style="color: #004080;">integer</span> <span style="color: #000000;">total_moves</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">0</span>
 
<span style="color: #004080;">atom</span> <span style="color: #000000;">t0</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">time</span><span style="color: #0000FF;">()</span>
-- "hardest case" from http://www.cube20.org
moves = {F, Us, F2, Ds, B, U, Rs, Fs, L, Ds,
<span style="color: #000080;font-style:italic;">-- "hardest case" from http://www.cube20.org</span>
Rs, Us, L, U, Bs, D2, Rs, F, U2, D2}
<span style="color: #000000;">moves</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">F</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">Us</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">F2</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">Ds</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">B</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">U</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">Rs</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">Fs</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">L</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">Ds</span><span style="color: #0000FF;">,</span>
cube = apply_moves(init,moves)
<span style="color: #000000;">Rs</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">Us</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">L</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">U</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">Bs</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">D2</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">Rs</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">F</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">U2</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">D2</span><span style="color: #0000FF;">}</span>
if length(moves)<=20 then
<span style="color: #000000;">cube</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">apply_moves</span><span style="color: #0000FF;">(</span><span style="color: #000000;">init</span><span style="color: #0000FF;">,</span><span style="color: #000000;">moves</span><span style="color: #0000FF;">)</span>
printf(1,"scramble: %s\n",{moves_to_string(moves)})
<span style="color: #008080;">if</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">moves</span><span style="color: #0000FF;">)<=</span><span style="color: #000000;">20</span> <span style="color: #008080;">then</span>
end if
<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"scramble: %s\n"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">moves_to_string</span><span style="color: #0000FF;">(</span><span style="color: #000000;">moves</span><span style="color: #0000FF;">)})</span>
 
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
puts(1,substitute(cube,"-"," "))
 
<span style="color: #7060A8;">puts</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #7060A8;">substitute</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cube</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"-"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">" "</span><span style="color: #0000FF;">))</span>
for stage=CROSS to PLL do
moves = solve_stage(cube, stage)
<span style="color: #008080;">for</span> <span style="color: #000000;">stage</span><span style="color: #0000FF;">=</span><span style="color: #000000;">CROSS</span> <span style="color: #008080;">to</span> <span style="color: #000000;">PLL</span> <span style="color: #008080;">do</span>
total_moves += length(moves)
<span style="color: #000000;">moves</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">solve_stage</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cube</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">stage</span><span style="color: #0000FF;">)</span>
cube = apply_moves(cube,moves)
<span style="color: #000000;">total_moves</span> <span style="color: #0000FF;">+=</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">moves</span><span style="color: #0000FF;">)</span>
printf(1,"%s: %s\n",{stage_desc[stage],moves_to_string(moves)})
<span style="color: #000000;">cube</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">apply_moves</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cube</span><span style="color: #0000FF;">,</span><span style="color: #000000;">moves</span><span style="color: #0000FF;">)</span>
if length(moves) then
<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"%s: %s\n"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">stage_desc</span><span style="color: #0000FF;">[</span><span style="color: #000000;">stage</span><span style="color: #0000FF;">],</span><span style="color: #000000;">moves_to_string</span><span style="color: #0000FF;">(</span><span style="color: #000000;">moves</span><span style="color: #0000FF;">)})</span>
puts(1,substitute(cube,"-"," "))
<span style="color: #008080;">if</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">moves</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">then</span>
end if
<span style="color: #7060A8;">puts</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #7060A8;">substitute</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cube</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"-"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">" "</span><span style="color: #0000FF;">))</span>
end for
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
printf(1,"\nsolution of %d total moves found in %3.2fs\n",{total_moves,time()-t0})
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
end procedure
<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"\nsolution of %d total moves found in %3.2fs\n"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">total_moves</span><span style="color: #0000FF;">,</span><span style="color: #7060A8;">time</span><span style="color: #0000FF;">()-</span><span style="color: #000000;">t0</span><span style="color: #0000FF;">})</span>
main()</lang>
<span style="color: #008080;">end</span> <span style="color: #008080;">procedure</span>
<span style="color: #000000;">main</span><span style="color: #0000FF;">()</span>
<!--</lang>-->
{{Out}}
The "hardest case" from http://www.cube20.org with a high threshold. You can try this manually.
Line 1,771 ⟶ 1,774:
Translation/de-golf(hrumph) of Tomas Sirgedas' winning entry from http://tomas.rokicki.com/cubecontest as held in 2004.<br>
Faster and shorter solutions (in most cases) than cfop, however probably nigh on impossible to debug/enhance...
<!--<lang Phix>(phixonline)-->
<span style="color: #000080;font-style:italic;">--
-- demo\rosetta\rubik_tomas.exw
-- demo\rosetta\rubik_tomas.exw
--
--</span>
function xor_string(string s)
<span style="color: #008080;">with</span> <span style="color: #008080;">javascript_semantics</span>
return xor_bits(s[1],xor_bits(s[2],iff(length(s)=3?s[3]:'!')))
<span style="color: #008080;">function</span> <span style="color: #000000;">xor_string</span><span style="color: #0000FF;">(</span><span style="color: #004080;">string</span> <span style="color: #000000;">s</span><span style="color: #0000FF;">)</span>
end function
<span style="color: #008080;">return</span> <span style="color: #7060A8;">xor_bits</span><span style="color: #0000FF;">(</span><span style="color: #000000;">s</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">],</span><span style="color: #7060A8;">xor_bits</span><span style="color: #0000FF;">(</span><span style="color: #000000;">s</span><span style="color: #0000FF;">[</span><span style="color: #000000;">2</span><span style="color: #0000FF;">],</span><span style="color: #008080;">iff</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">s</span><span style="color: #0000FF;">)=</span><span style="color: #000000;">3</span><span style="color: #0000FF;">?</span><span style="color: #000000;">s</span><span style="color: #0000FF;">[</span><span style="color: #000000;">3</span><span style="color: #0000FF;">]:</span><span style="color: #008000;">'!'</span><span style="color: #0000FF;">)))</span>
 
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
function xor_all(sequence s)
for i=1 to length(s) do
<span style="color: #008080;">function</span> <span style="color: #000000;">xor_all</span><span style="color: #0000FF;">(</span><span style="color: #004080;">sequence</span> <span style="color: #000000;">s</span><span style="color: #0000FF;">)</span>
s[i] = xor_string(s[i])
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">s</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">do</span>
end for
<span style="color: #000000;">s</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">xor_string</span><span style="color: #0000FF;">(</span><span style="color: #000000;">s</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">])</span>
return s
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
end function
<span style="color: #008080;">return</span> <span style="color: #000000;">s</span>
 
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
constant d1 = xor_all(split("UF DF UB DB UR DR UL DL FR FL BR BL UFR DBR UBL DFL DLB ULF DRF URB"))
-- This is Mike Reid's notation, 12 sides then 8 corners, which may be rotated - hence we xor the
<span style="color: #008080;">constant</span> <span style="color: #000000;">d1</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">xor_all</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">split</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"UF DF UB DB UR DR UL DL FR FL BR BL UFR DBR UBL DFL DLB ULF DRF URB"</span><span style="color: #0000FF;">))</span>
-- characters for fast lookup. The above string represents a cube in the solved state.
<span style="color: #000080;font-style:italic;">-- This is Mike Reid's notation, 12 sides then 8 corners, which may be rotated - hence we xor the
 
-- characters for fast lookup. The above string represents a cube in the solved state.</span>
constant d2 = {18,12,17,15,0, 9,1,8,16,14,19,13,2,10,3,11,12,18,13,19,4,8,5,10,
14,16,15,17,6,11,7,9,17,12,19,14,6, 0,4, 2,18,15,16,13,1,7,3, 5}
<span style="color: #008080;">constant</span> <span style="color: #000000;">d2</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">18</span><span style="color: #0000FF;">,</span><span style="color: #000000;">12</span><span style="color: #0000FF;">,</span><span style="color: #000000;">17</span><span style="color: #0000FF;">,</span><span style="color: #000000;">15</span><span style="color: #0000FF;">,</span><span style="color: #000000;">0</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">9</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #000000;">8</span><span style="color: #0000FF;">,</span><span style="color: #000000;">16</span><span style="color: #0000FF;">,</span><span style="color: #000000;">14</span><span style="color: #0000FF;">,</span><span style="color: #000000;">19</span><span style="color: #0000FF;">,</span><span style="color: #000000;">13</span><span style="color: #0000FF;">,</span><span style="color: #000000;">2</span><span style="color: #0000FF;">,</span><span style="color: #000000;">10</span><span style="color: #0000FF;">,</span><span style="color: #000000;">3</span><span style="color: #0000FF;">,</span><span style="color: #000000;">11</span><span style="color: #0000FF;">,</span><span style="color: #000000;">12</span><span style="color: #0000FF;">,</span><span style="color: #000000;">18</span><span style="color: #0000FF;">,</span><span style="color: #000000;">13</span><span style="color: #0000FF;">,</span><span style="color: #000000;">19</span><span style="color: #0000FF;">,</span><span style="color: #000000;">4</span><span style="color: #0000FF;">,</span><span style="color: #000000;">8</span><span style="color: #0000FF;">,</span><span style="color: #000000;">5</span><span style="color: #0000FF;">,</span><span style="color: #000000;">10</span><span style="color: #0000FF;">,</span>
--?sort(d2): (0..11 appear twice, 12..19 appear thrice - edges/corners is pretty much all I can say)
<span style="color: #000000;">14</span><span style="color: #0000FF;">,</span><span style="color: #000000;">16</span><span style="color: #0000FF;">,</span><span style="color: #000000;">15</span><span style="color: #0000FF;">,</span><span style="color: #000000;">17</span><span style="color: #0000FF;">,</span><span style="color: #000000;">6</span><span style="color: #0000FF;">,</span><span style="color: #000000;">11</span><span style="color: #0000FF;">,</span><span style="color: #000000;">7</span><span style="color: #0000FF;">,</span><span style="color: #000000;">9</span><span style="color: #0000FF;">,</span><span style="color: #000000;">17</span><span style="color: #0000FF;">,</span><span style="color: #000000;">12</span><span style="color: #0000FF;">,</span><span style="color: #000000;">19</span><span style="color: #0000FF;">,</span><span style="color: #000000;">14</span><span style="color: #0000FF;">,</span><span style="color: #000000;">6</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">0</span><span style="color: #0000FF;">,</span><span style="color: #000000;">4</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">2</span><span style="color: #0000FF;">,</span><span style="color: #000000;">18</span><span style="color: #0000FF;">,</span><span style="color: #000000;">15</span><span style="color: #0000FF;">,</span><span style="color: #000000;">16</span><span style="color: #0000FF;">,</span><span style="color: #000000;">13</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #000000;">7</span><span style="color: #0000FF;">,</span><span style="color: #000000;">3</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">5</span><span style="color: #0000FF;">}</span>
 
<span style="color: #000080;font-style:italic;">--?sort(d2): (0..11 appear twice, 12..19 appear thrice - edges/corners is pretty much all I can say)</span>
constant d3 = {13,16,15,1,3,
19,18,17,4,6}
<span style="color: #008080;">constant</span> <span style="color: #000000;">d3</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">13</span><span style="color: #0000FF;">,</span><span style="color: #000000;">16</span><span style="color: #0000FF;">,</span><span style="color: #000000;">15</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #000000;">3</span><span style="color: #0000FF;">,</span>
-- these apppear to be swapped during initialisation, dunno why...
<span style="color: #000000;">19</span><span style="color: #0000FF;">,</span><span style="color: #000000;">18</span><span style="color: #0000FF;">,</span><span style="color: #000000;">17</span><span style="color: #0000FF;">,</span><span style="color: #000000;">4</span><span style="color: #0000FF;">,</span><span style="color: #000000;">6</span><span style="color: #0000FF;">}</span>
 
<span style="color: #000080;font-style:italic;">-- these apppear to be swapped during initialisation, dunno why...</span>
integer cur_phase, search_mode, history_idx
sequence history_mov = repeat(0,48),
<span style="color: #004080;">integer</span> <span style="color: #000000;">cur_phase</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">search_mode</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">history_idx</span>
history_rpt = repeat(0,48),
<span style="color: #004080;">sequence</span> <span style="color: #000000;">history_mov</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">repeat</span><span style="color: #0000FF;">(</span><span style="color: #000000;">0</span><span style="color: #0000FF;">,</span><span style="color: #000000;">48</span><span style="color: #0000FF;">),</span>
depth_to_go,
<span style="color: #000000;">history_rpt</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">repeat</span><span style="color: #0000FF;">(</span><span style="color: #000000;">0</span><span style="color: #0000FF;">,</span><span style="color: #000000;">48</span><span style="color: #0000FF;">),</span>
hash_table = repeat(repeat(6,6912),48)
<span style="color: #000000;">depth_to_go</span><span style="color: #0000FF;">,</span>
-- (hash_table can/should be preserved for different problems)
<span style="color: #000000;">hash_table</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">repeat</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">repeat</span><span style="color: #0000FF;">(</span><span style="color: #000000;">6</span><span style="color: #0000FF;">,</span><span style="color: #000000;">6912</span><span style="color: #0000FF;">),</span><span style="color: #000000;">48</span><span style="color: #0000FF;">)</span>
 
<span style="color: #000080;font-style:italic;">-- (hash_table can/should be preserved for different problems)</span>
sequence cubelet_pos = repeat(0,48),
cubelet_twi = repeat(0,48)
<span style="color: #004080;">sequence</span> <span style="color: #000000;">cubelet_pos</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">repeat</span><span style="color: #0000FF;">(</span><span style="color: #000000;">0</span><span style="color: #0000FF;">,</span><span style="color: #000000;">48</span><span style="color: #0000FF;">),</span>
 
<span style="color: #000000;">cubelet_twi</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">repeat</span><span style="color: #0000FF;">(</span><span style="color: #000000;">0</span><span style="color: #0000FF;">,</span><span style="color: #000000;">48</span><span style="color: #0000FF;">)</span>
procedure rot(integer cur_phase)
if cur_phase<4 then
<span style="color: #008080;">procedure</span> <span style="color: #000000;">rot</span><span style="color: #0000FF;">(</span><span style="color: #004080;">integer</span> <span style="color: #000000;">cur_phase</span><span style="color: #0000FF;">)</span>
for i=0 to 3 do
<span style="color: #008080;">if</span> <span style="color: #000000;">cur_phase</span><span style="color: #0000FF;"><</span><span style="color: #000000;">4</span> <span style="color: #008080;">then</span>
integer di = cur_phase*8+i+1,
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span> <span style="color: #008080;">to</span> <span style="color: #000000;">3</span> <span style="color: #008080;">do</span>
j = d2[di]+1,
<span style="color: #004080;">integer</span> <span style="color: #000000;">di</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">cur_phase</span><span style="color: #0000FF;">*</span><span style="color: #000000;">8</span><span style="color: #0000FF;">+</span><span style="color: #000000;">i</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span>
k = d2[di+4]+1
<span style="color: #000000;">j</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">d2</span><span style="color: #0000FF;">[</span><span style="color: #000000;">di</span><span style="color: #0000FF;">]+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span>
cubelet_twi[j] = mod(cubelet_twi[j]+2-mod(i,2),3)
<span style="color: #000000;">k</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">d2</span><span style="color: #0000FF;">[</span><span style="color: #000000;">di</span><span style="color: #0000FF;">+</span><span style="color: #000000;">4</span><span style="color: #0000FF;">]+</span><span style="color: #000000;">1</span>
cubelet_twi[k] = xor_bits(cubelet_twi[k],cur_phase<2)
<span style="color: #000000;">cubelet_twi</span><span style="color: #0000FF;">[</span><span style="color: #000000;">j</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">mod</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cubelet_twi</span><span style="color: #0000FF;">[</span><span style="color: #000000;">j</span><span style="color: #0000FF;">]+</span><span style="color: #000000;">2</span><span style="color: #0000FF;">-</span><span style="color: #7060A8;">mod</span><span style="color: #0000FF;">(</span><span style="color: #000000;">i</span><span style="color: #0000FF;">,</span><span style="color: #000000;">2</span><span style="color: #0000FF;">),</span><span style="color: #000000;">3</span><span style="color: #0000FF;">)</span>
end for
<span style="color: #000000;">cubelet_twi</span><span style="color: #0000FF;">[</span><span style="color: #000000;">k</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">xor_bits</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cubelet_twi</span><span style="color: #0000FF;">[</span><span style="color: #000000;">k</span><span style="color: #0000FF;">],</span><span style="color: #000000;">cur_phase</span><span style="color: #0000FF;"><</span><span style="color: #000000;">2</span><span style="color: #0000FF;">)</span>
end if
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
for i=0 to 6 do
integer di = cur_phase*8+i+1,
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span> <span style="color: #008080;">to</span> <span style="color: #000000;">6</span> <span style="color: #008080;">do</span>
j = d2[di+(i!=3)]+1,
<span style="color: #004080;">integer</span> <span style="color: #000000;">di</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">cur_phase</span><span style="color: #0000FF;">*</span><span style="color: #000000;">8</span><span style="color: #0000FF;">+</span><span style="color: #000000;">i</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span>
k = d2[di]+1
<span style="color: #000000;">j</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">d2</span><span style="color: #0000FF;">[</span><span style="color: #000000;">di</span><span style="color: #0000FF;">+(</span><span style="color: #000000;">i</span><span style="color: #0000FF;">!=</span><span style="color: #000000;">3</span><span style="color: #0000FF;">)]+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span>
-- swap(cubelet[j]], cubelet[k]);
<span style="color: #000000;">k</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">d2</span><span style="color: #0000FF;">[</span><span style="color: #000000;">di</span><span style="color: #0000FF;">]+</span><span style="color: #000000;">1</span>
{cubelet_pos[j],cubelet_pos[k]} = {cubelet_pos[k],cubelet_pos[j]}
<span style="color: #000080;font-style:italic;">-- swap(cubelet[j]], cubelet[k]);</span>
{cubelet_twi[j],cubelet_twi[k]} = {cubelet_twi[k],cubelet_twi[j]}
<span style="color: #0000FF;">{</span><span style="color: #000000;">cubelet_pos</span><span style="color: #0000FF;">[</span><span style="color: #000000;">j</span><span style="color: #0000FF;">],</span><span style="color: #000000;">cubelet_pos</span><span style="color: #0000FF;">[</span><span style="color: #000000;">k</span><span style="color: #0000FF;">]}</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">cubelet_pos</span><span style="color: #0000FF;">[</span><span style="color: #000000;">k</span><span style="color: #0000FF;">],</span><span style="color: #000000;">cubelet_pos</span><span style="color: #0000FF;">[</span><span style="color: #000000;">j</span><span style="color: #0000FF;">]}</span>
end for
<span style="color: #0000FF;">{</span><span style="color: #000000;">cubelet_twi</span><span style="color: #0000FF;">[</span><span style="color: #000000;">j</span><span style="color: #0000FF;">],</span><span style="color: #000000;">cubelet_twi</span><span style="color: #0000FF;">[</span><span style="color: #000000;">k</span><span style="color: #0000FF;">]}</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">cubelet_twi</span><span style="color: #0000FF;">[</span><span style="color: #000000;">k</span><span style="color: #0000FF;">],</span><span style="color: #000000;">cubelet_twi</span><span style="color: #0000FF;">[</span><span style="color: #000000;">j</span><span style="color: #0000FF;">]}</span>
end procedure
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
 
<span style="color: #008080;">end</span> <span style="color: #008080;">procedure</span>
function hashf()
int ret = 0;
<span style="color: #008080;">function</span> <span style="color: #000000;">hashf</span><span style="color: #0000FF;">()</span>
switch cur_phase do
<span style="color: #004080;">int</span> <span style="color: #000000;">ret</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">0</span><span style="color: #0000FF;">;</span>
case 0:
<span style="color: #008080;">switch</span> <span style="color: #000000;">cur_phase</span> <span style="color: #008080;">do</span>
for i=0 to 10 do
<span style="color: #008080;">case</span> <span style="color: #000000;">0</span><span style="color: #0000FF;">:</span>
ret += ret + cubelet_twi[i+1]
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span> <span style="color: #008080;">to</span> <span style="color: #000000;">10</span> <span style="color: #008080;">do</span>
end for
<span style="color: #000000;">ret</span> <span style="color: #0000FF;">+=</span> <span style="color: #000000;">ret</span> <span style="color: #0000FF;">+</span> <span style="color: #000000;">cubelet_twi</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span>
return ret;
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
case 1:
<span style="color: #008080;">return</span> <span style="color: #000000;">ret</span><span style="color: #0000FF;">;</span>
for i=0 to 6 do
<span style="color: #008080;">case</span> <span style="color: #000000;">1</span><span style="color: #0000FF;">:</span>
ret = ret*3 + cubelet_twi[i+12+1]
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span> <span style="color: #008080;">to</span> <span style="color: #000000;">6</span> <span style="color: #008080;">do</span>
end for
<span style="color: #000000;">ret</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">ret</span><span style="color: #0000FF;">*</span><span style="color: #000000;">3</span> <span style="color: #0000FF;">+</span> <span style="color: #000000;">cubelet_twi</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">+</span><span style="color: #000000;">12</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span>
for i=0 to 10 do
<span style="color: #008080;">end</span> ret<span +style="color: ret + (cubelet_pos[i+1]#008080;">for</span>7)
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span> <span style="color: #008080;">to</span> <span style="color: #000000;">10</span> <span style="color: #008080;">do</span>
end for
<span style="color: #000000;">ret</span> <span style="color: #0000FF;">+=</span> <span style="color: #000000;">ret</span> <span style="color: #0000FF;">+</span> <span style="color: #0000FF;">(</span><span style="color: #000000;">cubelet_pos</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]></span><span style="color: #000000;">7</span><span style="color: #0000FF;">)</span>
return ret-7;
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
case 2:
<span style="color: #008080;">return</span> <span style="color: #000000;">ret</span><span style="color: #0000FF;">-</span><span style="color: #000000;">7</span><span style="color: #0000FF;">;</span>
sequence inva = repeat(0,48),
<span style="color: #008080;">case</span> <span style="color: #000000;">2</span><span style="color: #0000FF;">:</span>
b = repeat(0,48)
<span style="color: #004080;">sequence</span> <span style="color: #000000;">inva</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">repeat</span><span style="color: #0000FF;">(</span><span style="color: #000000;">0</span><span style="color: #0000FF;">,</span><span style="color: #000000;">48</span><span style="color: #0000FF;">),</span>
for i=0 to 7 do
<span style="color: #000000;">b</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">repeat</span><span style="color: #0000FF;">(</span><span style="color: #000000;">0</span><span style="color: #0000FF;">,</span><span style="color: #000000;">48</span><span style="color: #0000FF;">)</span>
integer ci12p = cubelet_pos[i+12+1],
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span> <span style="color: #008080;">to</span> <span style="color: #000000;">7</span> <span style="color: #008080;">do</span>
ci12p3 = and_bits(ci12p,3)
<span style="color: #004080;">integer</span> <span style="color: #000000;">ci12p</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">cubelet_pos</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">+</span><span style="color: #000000;">12</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">],</span>
if ci12p<16 then
<span style="color: #000000;">ci12p3</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">and_bits</span><span style="color: #0000FF;">(</span><span style="color: #000000;">ci12p</span><span style="color: #0000FF;">,</span><span style="color: #000000;">3</span><span style="color: #0000FF;">)</span>
inva[ci12p3+1] = ret
<span style="color: #008080;">if</span> <span style="color: #000000;">ci12p</span><span style="color: #0000FF;"><</span><span style="color: #000000;">16</span> <span style="color: #008080;">then</span>
ret += 1
<span style="color: #000000;">inva</span><span style="color: #0000FF;">[</span><span style="color: #000000;">ci12p3</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">ret</span>
else
b[i- <span style="color: #000000;">ret+1]</span> <span style="color: ci12p3#0000FF;">+=</span> <span style="color: #000000;">1</span>
end if<span style="color: #008080;">else</span>
<span style="color: #000000;">b</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">-</span><span style="color: #000000;">ret</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">ci12p3</span>
end for
for i <span style=0"color: to#008080;">end</span> 6<span style="color: do#008080;">if</span>
<span style="color: #008080;">end</span> ret<span +style="color: ret + (cubelet_pos[i+1]>3)#008080;">for</span>
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span> <span style="color: #008080;">to</span> <span style="color: #000000;">6</span> <span style="color: #008080;">do</span>
end for
<span style="color: #000000;">ret</span> <span style="color: #0000FF;">+=</span> <span style="color: #000000;">ret</span> <span style="color: #0000FF;">+</span> <span style="color: #0000FF;">(</span><span style="color: #000000;">cubelet_pos</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]></span><span style="color: #000000;">3</span><span style="color: #0000FF;">);</span>
for i=0 to 6 do
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
ret += ret + (cubelet_pos[i+12+1]>15);
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span> <span style="color: #008080;">to</span> <span style="color: #000000;">6</span> <span style="color: #008080;">do</span>
end for
<span style="color: #000000;">ret</span> <span style="color: #0000FF;">+=</span> <span style="color: #000000;">ret</span> <span style="color: #0000FF;">+</span> <span style="color: #0000FF;">(</span><span style="color: #000000;">cubelet_pos</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">+</span><span style="color: #000000;">12</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]></span><span style="color: #000000;">15</span><span style="color: #0000FF;">);</span>
integer ib2 = xor_bits(inva[b[1]+1],inva[b[2]+1])*2,
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
ib3 = xor_bits(inva[b[1]+1],inva[b[3]+1]),
<span style="color: #004080;">integer</span> <span style="color: #000000;">ib2</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">xor_bits</span><span style="color: #0000FF;">(</span><span style="color: #000000;">inva</span><span style="color: #0000FF;">[</span><span style="color: #000000;">b</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">],</span><span style="color: #000000;">inva</span><span style="color: #0000FF;">[</span><span style="color: #000000;">b</span><span style="color: #0000FF;">[</span><span style="color: #000000;">2</span><span style="color: #0000FF;">]+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">])*</span><span style="color: #000000;">2</span><span style="color: #0000FF;">,</span>
ib4 = xor_bits(inva[b[1]+1],inva[b[4]+1])
<span style="color: #000000;">ib3</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">xor_bits</span><span style="color: #0000FF;">(</span><span style="color: #000000;">inva</span><span style="color: #0000FF;">[</span><span style="color: #000000;">b</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">],</span><span style="color: #000000;">inva</span><span style="color: #0000FF;">[</span><span style="color: #000000;">b</span><span style="color: #0000FF;">[</span><span style="color: #000000;">3</span><span style="color: #0000FF;">]+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]),</span>
return ret*54 + ib2 + (ib3 > ib4) - 3587708
<span style="color: #000000;">ib4</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">xor_bits</span><span style="color: #0000FF;">(</span><span style="color: #000000;">inva</span><span style="color: #0000FF;">[</span><span style="color: #000000;">b</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">],</span><span style="color: #000000;">inva</span><span style="color: #0000FF;">[</span><span style="color: #000000;">b</span><span style="color: #0000FF;">[</span><span style="color: #000000;">4</span><span style="color: #0000FF;">]+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">])</span>
end switch
<span style="color: #008080;">return</span> <span style="color: #000000;">ret</span><span style="color: #0000FF;">*</span><span style="color: #000000;">54</span> <span style="color: #0000FF;">+</span> <span style="color: #000000;">ib2</span> <span style="color: #0000FF;">+</span> <span style="color: #0000FF;">(</span><span style="color: #000000;">ib3</span> <span style="color: #0000FF;">></span> <span style="color: #000000;">ib4</span><span style="color: #0000FF;">)</span> <span style="color: #0000FF;">-</span> <span style="color: #000000;">3587708</span>
for i=0 to 4 do
<span style="color: #008080;">end</span> <span style="color: #008080;">switch</span>
ret *= 24;
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span> <span style="color: #008080;">to</span> <span style="color: #000000;">4</span> <span style="color: #008080;">do</span>
for cp=0 to 3 do
<span style="color: #000000;">ret</span> <span style="color: #0000FF;">*=</span> <span style="color: #000000;">24</span><span style="color: #0000FF;">;</span>
for k=0 to cp-1 do
<span style="color: #008080;">for</span> <span style="color: #000000;">cp</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span> <span style="color: #008080;">to</span> <span style="color: #000000;">3</span> <span style="color: #008080;">do</span>
if cubelet_pos[i*4+cp+1] < cubelet_pos[i*4+k+1] then
<span style="color: #008080;">for</span> <span style="color: #000000;">k</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span> <span style="color: #008080;">to</span> <span style="color: #000000;">cp</span><span style="color: #0000FF;">-</span><span style="color: #000000;">1</span> <span style="color: #008080;">do</span>
ret += cp + iff(cp=3?cp:0)
<span style="color: #008080;">if</span> <span style="color: #000000;">cubelet_pos</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">*</span><span style="color: #000000;">4</span><span style="color: #0000FF;">+</span><span style="color: #000000;">cp</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;"><</span> <span style="color: #000000;">cubelet_pos</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">*</span><span style="color: #000000;">4</span><span style="color: #0000FF;">+</span><span style="color: #000000;">k</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span> <span style="color: #008080;">then</span>
end if
<span style="color: #000000;">ret</span> <span style="color: #0000FF;">+=</span> <span style="color: #000000;">cp</span> <span style="color: #0000FF;">+</span> <span style="color: #008080;">iff</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cp</span><span style="color: #0000FF;">=</span><span style="color: #000000;">3</span><span style="color: #0000FF;">?</span><span style="color: #000000;">cp</span><span style="color: #0000FF;">:</span><span style="color: #000000;">0</span><span style="color: #0000FF;">)</span>
end for
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
end for
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
end for
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
return floor(ret/2)
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
end function
<span style="color: #008080;">return</span> <span style="color: #7060A8;">floor</span><span style="color: #0000FF;">(</span><span style="color: #000000;">ret</span><span style="color: #0000FF;">/</span><span style="color: #000000;">2</span><span style="color: #0000FF;">)</span>
 
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
function do_search(integer dpt)
integer h = hashf(),
<span style="color: #008080;">function</span> <span style="color: #000000;">do_search</span><span style="color: #0000FF;">(</span><span style="color: #004080;">integer</span> <span style="color: #000000;">dpt</span><span style="color: #0000FF;">)</span>
q = (floor(cur_phase/2)*19+8)*power(2,7),
<span style="color: #004080;">integer</span> <span style="color: #000000;">h</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">hashf</span><span style="color: #0000FF;">(),</span>
hmq = mod(h,q)+1,
<span style="color: #000000;">q</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">(</span><span style="color: #7060A8;">floor</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cur_phase</span><span style="color: #0000FF;">/</span><span style="color: #000000;">2</span><span style="color: #0000FF;">)*</span><span style="color: #000000;">19</span><span style="color: #0000FF;">+</span><span style="color: #000000;">8</span><span style="color: #0000FF;">)*</span><span style="color: #7060A8;">power</span><span style="color: #0000FF;">(</span><span style="color: #000000;">2</span><span style="color: #0000FF;">,</span><span style="color: #000000;">7</span><span style="color: #0000FF;">),</span>
hfq = floor(h/q)+1,
<span style="color: #000000;">hmq</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">mod</span><span style="color: #0000FF;">(</span><span style="color: #000000;">h</span><span style="color: #0000FF;">,</span><span style="color: #000000;">q</span><span style="color: #0000FF;">)+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span>
d = (dpt < hash_table[cur_phase+1][hmq] or
<span style="color: #000000;">hfq</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">floor</span><span style="color: #0000FF;">(</span><span style="color: #000000;">h</span><span style="color: #0000FF;">/</span><span style="color: #000000;">q</span><span style="color: #0000FF;">)+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span>
dpt < hash_table[cur_phase+4+1][hfq])
<span style="color: #000000;">d</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">(</span><span style="color: #000000;">dpt</span> <span style="color: #0000FF;"><</span> <span style="color: #000000;">hash_table</span><span style="color: #0000FF;">[</span><span style="color: #000000;">cur_phase</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">][</span><span style="color: #000000;">hmq</span><span style="color: #0000FF;">]</span> <span style="color: #008080;">or</span>
 
<span style="color: #000000;">dpt</span> <span style="color: #0000FF;"><</span> <span style="color: #000000;">hash_table</span><span style="color: #0000FF;">[</span><span style="color: #000000;">cur_phase</span><span style="color: #0000FF;">+</span><span style="color: #000000;">4</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">][</span><span style="color: #000000;">hfq</span><span style="color: #0000FF;">])</span>
if d xor search_mode then
if search_mode then
<span style="color: #008080;">if</span> <span style="color: #000000;">d</span> <span style="color: #008080;">xor</span> <span style="color: #000000;">search_mode</span> <span style="color: #008080;">then</span>
if dpt <= depth_to_go[h+1] then
<span style="color: #008080;">if</span> <span style="color: #000000;">search_mode</span> <span style="color: #008080;">then</span>
return not h;
<span style="color: #008080;">if</span> <span style="color: #000000;">dpt</span> <span style="color: #0000FF;"><=</span> <span style="color: #000000;">depth_to_go</span><span style="color: #0000FF;">[</span><span style="color: #000000;">h</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span> <span style="color: #008080;">then</span>
else
<span style="color: #008080;">return</span> <span style="color: #008080;">not</span> <span style="color: #000000;">h</span><span style="color: #0000FF;">;</span>
depth_to_go[h+1] = dpt;
end if<span style="color: #008080;">else</span>
<span style="color: #000000;">depth_to_go</span><span style="color: #0000FF;">[</span><span style="color: #000000;">h</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">dpt</span><span style="color: #0000FF;">;</span>
end if
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
 
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
hash_table[cur_phase+1][hmq] = min(hash_table[cur_phase+1][hmq],dpt);
hash_table[cur_phase+5][hfq] = min(hash_table[cur_phase+5][hfq],dpt);
<span style="color: #000000;">hash_table</span><span style="color: #0000FF;">[</span><span style="color: #000000;">cur_phase</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">][</span><span style="color: #000000;">hmq</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">min</span><span style="color: #0000FF;">(</span><span style="color: #000000;">hash_table</span><span style="color: #0000FF;">[</span><span style="color: #000000;">cur_phase</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">][</span><span style="color: #000000;">hmq</span><span style="color: #0000FF;">],</span><span style="color: #000000;">dpt</span><span style="color: #0000FF;">);</span>
<span style="color: #000000;">hash_table</span><span style="color: #0000FF;">[</span><span style="color: #000000;">cur_phase</span><span style="color: #0000FF;">+</span><span style="color: #000000;">5</span><span style="color: #0000FF;">][</span><span style="color: #000000;">hfq</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">min</span><span style="color: #0000FF;">(</span><span style="color: #000000;">hash_table</span><span style="color: #0000FF;">[</span><span style="color: #000000;">cur_phase</span><span style="color: #0000FF;">+</span><span style="color: #000000;">5</span><span style="color: #0000FF;">][</span><span style="color: #000000;">hfq</span><span style="color: #0000FF;">],</span><span style="color: #000000;">dpt</span><span style="color: #0000FF;">);</span>
for k=0 to 5 do
for i=0 to 3 do
<span style="color: #008080;">for</span> <span style="color: #000000;">k</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span> <span style="color: #008080;">to</span> <span style="color: #000000;">5</span> <span style="color: #008080;">do</span>
rot(k)
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span> <span style="color: #008080;">to</span> <span style="color: #000000;">3</span> <span style="color: #008080;">do</span>
if (k>=cur_phase*2 or i=1) and i<=2 then
<span style="color: #000000;">rot</span><span style="color: #0000FF;">(</span><span style="color: #000000;">k</span><span style="color: #0000FF;">)</span>
history_idx += 1
<span style="color: #008080;">if</span> <span style="color: #0000FF;">(</span><span style="color: #000000;">k</span><span style="color: #0000FF;">>=</span><span style="color: #000000;">cur_phase</span><span style="color: #0000FF;">*</span><span style="color: #000000;">2</span> <span style="color: #008080;">or</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">and</span> <span style="color: #000000;">i</span><span style="color: #0000FF;"><=</span><span style="color: #000000;">2</span> <span style="color: #008080;">then</span>
history_mov[history_idx] = k
history_rpt[ <span style="color: #000000;">history_idx]</span> <span style="color: #0000FF;">+=</span> <span style="color: i#000000;">1</span>
<span style="color: #000000;">history_mov</span><span style="color: #0000FF;">[</span><span style="color: #000000;">history_idx</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">k</span>
if do_search(dpt-search_mode*2+1) then return 1 end if
<span style="color: #000000;">history_rpt</span><span style="color: #0000FF;">[</span><span style="color: #000000;">history_idx</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">i</span>
history_idx -= 1
<span style="color: #008080;">if</span> <span style="color: #000000;">do_search</span><span style="color: #0000FF;">(</span><span style="color: #000000;">dpt</span><span style="color: #0000FF;">-</span><span style="color: #000000;">search_mode</span><span style="color: #0000FF;">*</span><span style="color: #000000;">2</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">then</span> <span style="color: #008080;">return</span> <span style="color: #000000;">1</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
end if
<span style="color: #000000;">history_idx</span> <span style="color: #0000FF;">-=</span> <span style="color: #000000;">1</span>
end for
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
end for
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
end if
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
return 0
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
end function
<span style="color: #008080;">return</span> <span style="color: #000000;">0</span>
 
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
function pack_moves()
string moves = ""
<span style="color: #008080;">function</span> <span style="color: #000000;">pack_moves</span><span style="color: #0000FF;">()</span>
integer n = 0, this, last, last_rpt
<span style="color: #004080;">string</span> <span style="color: #000000;">moves</span> <span style="color: #0000FF;">=</span> <span style="color: #008000;">""</span>
if history_idx!=0 then
<span style="color: #004080;">integer</span> <span style="color: #000000;">n</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">0</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">curr</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">last</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">last_rpt</span>
-- add a dummy move to trigger the last move print:
<span style="color: #008080;">if</span> <span style="color: #000000;">history_idx</span><span style="color: #0000FF;">!=</span><span style="color: #000000;">0</span> <span style="color: #008080;">then</span>
last = xor_bits(history_mov[history_idx],1) -- F<->B, etc
<span style="color: #000080;font-style:italic;">-- add a dummy move to trigger the last move print:</span>
history_idx += 1
<span style="color: #000000;">last</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">xor_bits</span><span style="color: #0000FF;">(</span><span style="color: #000000;">history_mov</span><span style="color: #0000FF;">[</span><span style="color: #000000;">history_idx</span><span style="color: #0000FF;">],</span><span style="color: #000000;">1</span><span style="color: #0000FF;">)</span> <span style="color: #000080;font-style:italic;">-- F&lt;-&gt;B, etc</span>
history_mov[history_idx] = last
<span style="color: #000000;">history_idx</span> <span style="color: #0000FF;">+=</span> <span style="color: #000000;">1</span>
history_rpt[history_idx] = 0
<span style="color: #000000;">history_mov</span><span style="color: #0000FF;">[</span><span style="color: #000000;">history_idx</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">last</span>
last = history_mov[1]
<span style="color: #000000;">history_rpt</span><span style="color: #0000FF;">[</span><span style="color: #000000;">history_idx</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">0</span>
last_rpt = 0
<span style="color: #000000;">last</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">history_mov</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span>
for i=1 to history_idx do
<span style="color: #000000;">last_rpt</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">0</span>
this = history_mov[i]
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #000000;">history_idx</span> <span style="color: #008080;">do</span>
if this!=last then
<span style="color: #000000;">curr</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">history_mov</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]</span>
-- coalesce eg F1F2 to F' (unless you wanna fix do_search()!)
<span style="color: #008080;">if</span> <span style="color: #000000;">curr</span><span style="color: #0000FF;">!=</span><span style="color: #000000;">last</span> <span style="color: #008080;">then</span>
if last_rpt then
<span style="color: #000080;font-style:italic;">-- coalesce eg F1F2 to F' (unless you wanna fix do_search()!)</span>
moves &= "FBRLUD"[last+1] & {"","2","'"}[last_rpt]
<span style="color: #008080;">if</span> <span style="color: #000000;">last_rpt</span> <span style="color: #008080;">then</span>
n += 1
<span style="color: #000000;">moves</span> <span style="color: #0000FF;">&=</span> <span style="color: #008000;">"FBRLUD"</span><span style="color: #0000FF;">[</span><span style="color: #000000;">last</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">&</span> <span style="color: #0000FF;">{</span><span style="color: #008000;">""</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"2"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"'"</span><span style="color: #0000FF;">}[</span><span style="color: #000000;">last_rpt</span><span style="color: #0000FF;">]</span>
end if
<span style="color: #000000;">n</span> <span style="color: #0000FF;">+=</span> <span style="color: #000000;">1</span>
last = this
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
last_rpt = history_rpt[i]+1
<span style="color: #000000;">last</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">curr</span>
else
<span style="color: #000000;">last_rpt</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">history_rpt</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]+</span><span style="color: #000000;">1</span>
last_rpt = mod(last_rpt+history_rpt[i]+1,4)
end if<span style="color: #008080;">else</span>
<span style="color: #000000;">last_rpt</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">mod</span><span style="color: #0000FF;">(</span><span style="color: #000000;">last_rpt</span><span style="color: #0000FF;">+</span><span style="color: #000000;">history_rpt</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #000000;">4</span><span style="color: #0000FF;">)</span>
end for
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
end if
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
return {moves,n,iff(n=1?"":"s")}
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
end function
<span style="color: #008080;">return</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">moves</span><span style="color: #0000FF;">,</span><span style="color: #000000;">n</span><span style="color: #0000FF;">,</span><span style="color: #008080;">iff</span><span style="color: #0000FF;">(</span><span style="color: #000000;">n</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span><span style="color: #0000FF;">?</span><span style="color: #008000;">""</span><span style="color: #0000FF;">:</span><span style="color: #008000;">"s"</span><span style="color: #0000FF;">)}</span>
 
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
function tomas(sequence args)
search_mode = 0
<span style="color: #008080;">function</span> <span style="color: #000000;">tomas</span><span style="color: #0000FF;">(</span><span style="color: #004080;">sequence</span> <span style="color: #000000;">args</span><span style="color: #0000FF;">)</span>
history_idx = 0
<span style="color: #000000;">search_mode</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">0</span>
depth_to_go = repeat(0,5*power(2,20))
<span style="color: #000000;">history_idx</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">0</span>
 
<span style="color: #000000;">depth_to_go</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">repeat</span><span style="color: #0000FF;">(</span><span style="color: #000000;">0</span><span style="color: #0000FF;">,</span><span style="color: #000000;">5</span><span style="color: #0000FF;">*</span><span style="color: #7060A8;">power</span><span style="color: #0000FF;">(</span><span style="color: #000000;">2</span><span style="color: #0000FF;">,</span><span style="color: #000000;">20</span><span style="color: #0000FF;">))</span>
for i=0 to 19 do
cubelet_pos[i+1] = i
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span> <span style="color: #008080;">to</span> <span style="color: #000000;">19</span> <span style="color: #008080;">do</span>
end for
<span style="color: #000000;">cubelet_pos</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">i</span>
for i=0 to 3 do
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
cur_phase = i
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span> <span style="color: #008080;">to</span> <span style="color: #000000;">3</span> <span style="color: #008080;">do</span>
{} = do_search(0)
<span style="color: #000000;">cur_phase</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">i</span>
end for
<span style="color: #0000FF;">{}</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">do_search</span><span style="color: #0000FF;">(</span><span style="color: #000000;">0</span><span style="color: #0000FF;">)</span>
args = split(args)
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
for i=0 to 19 do
<span style="color: #000000;">args</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">split</span><span style="color: #0000FF;">(</span><span style="color: #000000;">args</span><span style="color: #0000FF;">)</span>
string s = args[i+1] -- (may be rotated, eg RU or UR)
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span> <span style="color: #008080;">to</span> <span style="color: #000000;">19</span> <span style="color: #008080;">do</span>
integer p = find(xor_string(s),d1)
<span style="color: #004080;">string</span> <span style="color: #000000;">s</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">args</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span> <span style="color: #000080;font-style:italic;">-- (may be rotated, eg RU or UR)</span>
if p=0 then ?9/0 end if -- sensible message(bad args)?
<span style="color: #004080;">integer</span> <span style="color: #000000;">p</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">find</span><span style="color: #0000FF;">(</span><span style="color: #000000;">xor_string</span><span style="color: #0000FF;">(</span><span style="color: #000000;">s</span><span style="color: #0000FF;">),</span><span style="color: #000000;">d1</span><span style="color: #0000FF;">)</span>
cubelet_pos[i+1] = p-1
<span style="color: #008080;">if</span> <span style="color: #000000;">p</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span> <span style="color: #008080;">then</span> <span style="color: #0000FF;">?</span><span style="color: #000000;">9</span><span style="color: #0000FF;">/</span><span style="color: #000000;">0</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span> <span style="color: #000080;font-style:italic;">-- sensible message(bad args)?</span>
int x = max(find('U',s), find('D',s));
<span style="color: #000000;">cubelet_pos</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">p</span><span style="color: #0000FF;">-</span><span style="color: #000000;">1</span>
cubelet_twi[i+1] = iff(x!=0 ? x-1 : s[1]>'F')
<span style="color: #004080;">int</span> <span style="color: #000000;">x</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">max</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">find</span><span style="color: #0000FF;">(</span><span style="color: #008000;">'U'</span><span style="color: #0000FF;">,</span><span style="color: #000000;">s</span><span style="color: #0000FF;">),</span> <span style="color: #7060A8;">find</span><span style="color: #0000FF;">(</span><span style="color: #008000;">'D'</span><span style="color: #0000FF;">,</span><span style="color: #000000;">s</span><span style="color: #0000FF;">));</span>
end for
<span style="color: #000000;">cubelet_twi</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #008080;">iff</span><span style="color: #0000FF;">(</span><span style="color: #000000;">x</span><span style="color: #0000FF;">!=</span><span style="color: #000000;">0</span> <span style="color: #0000FF;">?</span> <span style="color: #000000;">x</span><span style="color: #0000FF;">-</span><span style="color: #000000;">1</span> <span style="color: #0000FF;">:</span> <span style="color: #000000;">s</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]></span><span style="color: #008000;">'F'</span><span style="color: #0000FF;">)</span>
for i=0 to 4 do
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
integer j = d3[i+1]+1,
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span> <span style="color: #008080;">to</span> <span style="color: #000000;">4</span> <span style="color: #008080;">do</span>
k = d3[i+6]+1
<span style="color: #004080;">integer</span> <span style="color: #000000;">j</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">d3</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]+</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span>
-- swap(cubelet[j], cubelet[k]);
<span style="color: #000000;">k</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">d3</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">+</span><span style="color: #000000;">6</span><span style="color: #0000FF;">]+</span><span style="color: #000000;">1</span>
{cubelet_pos[j],cubelet_pos[k]} = {cubelet_pos[k],cubelet_pos[j]}
<span style="color: #000080;font-style:italic;">-- swap(cubelet[j], cubelet[k]); </span>
{cubelet_twi[j],cubelet_twi[k]} = {cubelet_twi[k],cubelet_twi[j]}
<span style="color: #0000FF;">{</span><span style="color: #000000;">cubelet_pos</span><span style="color: #0000FF;">[</span><span style="color: #000000;">j</span><span style="color: #0000FF;">],</span><span style="color: #000000;">cubelet_pos</span><span style="color: #0000FF;">[</span><span style="color: #000000;">k</span><span style="color: #0000FF;">]}</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">cubelet_pos</span><span style="color: #0000FF;">[</span><span style="color: #000000;">k</span><span style="color: #0000FF;">],</span><span style="color: #000000;">cubelet_pos</span><span style="color: #0000FF;">[</span><span style="color: #000000;">j</span><span style="color: #0000FF;">]}</span>
end for
<span style="color: #0000FF;">{</span><span style="color: #000000;">cubelet_twi</span><span style="color: #0000FF;">[</span><span style="color: #000000;">j</span><span style="color: #0000FF;">],</span><span style="color: #000000;">cubelet_twi</span><span style="color: #0000FF;">[</span><span style="color: #000000;">k</span><span style="color: #0000FF;">]}</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">cubelet_twi</span><span style="color: #0000FF;">[</span><span style="color: #000000;">k</span><span style="color: #0000FF;">],</span><span style="color: #000000;">cubelet_twi</span><span style="color: #0000FF;">[</span><span style="color: #000000;">j</span><span style="color: #0000FF;">]}</span>
search_mode = 1;
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
for cp=0 to 3 do
<span style="color: #000000;">search_mode</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">1</span><span style="color: #0000FF;">;</span>
cur_phase = cp
<span style="color: #008080;">for</span> <span style="color: #000000;">cp</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span> <span style="color: #008080;">to</span> <span style="color: #000000;">3</span> <span style="color: #008080;">do</span>
for i=0 to 19 do
<span style="color: #000000;">cur_phase</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">cp</span>
if do_search(i) then exit end if
<span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">0</span> <span style="color: #008080;">to</span> <span style="color: #000000;">19</span> <span style="color: #008080;">do</span>
end for
<span style="color: #008080;">if</span> <span style="color: #000000;">do_search</span><span style="color: #0000FF;">(</span><span style="color: #000000;">i</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">then</span> <span style="color: #008080;">exit</span> <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
end for
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
return pack_moves()
<span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
end function
<span style="color: #008080;">return</span> <span style="color: #000000;">pack_moves</span><span style="color: #0000FF;">()</span>
 
<span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
printf(1,"%s (%d move%s)\n",tomas("UL DL RF UB FD BR DB UF DR UR BL FL FDR BLU DLB URB RUF FLD BRD FUL"))</lang>
<span style="color: #7060A8;">printf</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"%s (%d move%s)\n"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">tomas</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"UL DL RF UB FD BR DB UF DR UR BL FL FDR BLU DLB URB RUF FLD BRD FUL"</span><span style="color: #0000FF;">))</span>
<!--</lang>-->
{{out}}
<pre>
Petelomax
7,806

edits

Retrieved from "https://rosettacode.org/wiki/Special:MobileDiff/273888"
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