Sudoku: Difference between revisions
Added Uiua solution
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=={{header|Python}}==
See [http://www2.warwick.ac.uk/fac/sci/moac/currentstudents/peter_cock/python/sudoku/ Solving Sudoku puzzles with Python] for GPL'd solvers of increasing complexity of algorithm.
===Backtrack===
A simple backtrack algorithm -- Quick but may take longer if the grid had been more than 9 x 9
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</syntaxhighlight>
A Sudoku solver using search guided by the principles of wave function collapse.
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</syntaxhighlight>
This solver found the 45 unknown values in 45 steps.
=={{header|Racket}}==
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Finished solving!</pre>
=={{header|Uiua}}==
{{Works with |Uiua|0.12.0-dev.1}}
Uses experimental '''⮌ orient''' and '''astar''' (only as a lazy way of managing the iteration :-).
<syntaxhighlight lang="uiua">
# Solves Sudoku using brute force.
# Experimental!
S ← [[8 5 0 0 0 2 4 0 0]
[7 2 0 0 0 0 0 0 9]
[0 0 4 0 0 0 0 0 0]
[0 0 0 1 0 7 0 0 2]
[3 0 5 0 0 0 9 0 0]
[0 4 0 0 0 0 0 0 0]
[0 0 0 0 8 0 0 7 0]
[0 1 7 0 0 0 0 0 0]
[0 0 0 0 3 6 0 4 0]]
Ps ← ⊞⊟.⇡9
Boxes ← ↯∞_9_2 ⊡⊞⊂.0_3_6 ◫3_3Ps
Nines ← ⊂Boxes⊂⟜(⮌1_0)Ps # 27 lists of pos's: one per row, col, box.
IsIn ← ☇1▽:⟜≡(∊:)Nines ¤ # (pos) -> pos's of all peers for a pos.
Peers ← ⊞(IsIn ⊟).⇡9 # For each pos, the pos of every peer (by row, col, box)
Free ← ▽:⟜(¬∊)+1⇡9◴▽⊸(>0)⊡⊡:Peers # Free values at pos (pos board) -> [n]
Next ← (
=/↧.≡(⧻Free) ⊙¤,,⊚=0. # Find most constrained pos.
Free,,⊙◌⊢▽⊙. # Get free values at pos.
≡(⍜⊡⋅∘)λBCa # Generate node for each.
)
End ← =0/+/+=0
astar(⍣Next⋅[]|0|End)S
↙¯1°□⊢⊙◌
</syntaxhighlight>
{{out}}
<pre>
╭─
╷ 8 5 1 3 9 2 4 6 7
╷ 7 2 3 4 6 1 5 8 9
6 9 4 7 5 8 2 3 1
9 6 8 1 4 7 3 0 2
3 0 5 0 0 0 9 0 0
0 4 0 0 0 0 0 0 0
0 0 0 0 8 0 0 7 0
0 1 7 0 0 0 0 0 0
0 0 0 0 3 6 0 4 0
╯
</pre>
=={{header|Ursala}}==
<syntaxhighlight lang="ursala">#import std
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