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Square-free integers: Difference between revisions

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Square-free integers (view source)

Revision as of 21:25, 5 July 2018

185 bytes added ,  5 years ago
→‎{{header|Perl 6}}: Some re-factoring, slightly better performance, DRY, style twiddles. Some commentary on the algorithm.
m (Reverted edits by Dijkstra (talk) to last revision by Thundergnat)
(→‎{{header|Perl 6}}: Some re-factoring, slightly better performance, DRY, style twiddles. Some commentary on the algorithm.)
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=={{header|Perl 6}}==
{{works with|Rakudo|2018.06}}
The prime factoring algorithm is not really the best option for finding long runs of sequential square-free numbers. It works, but is probably better suited for testing arbitrary numbers rather than testing every sequential number from 1 to some limit. If you know that that is going to be your use case, there are faster algorithms than this.
 
<lang perl6># Prime factorization routines
Line 575 ⟶ 576:
return [] if $n == 1;
my $factor = find-factor( $n );
sort flat prime-factors( $factor ), prime-factors( $n div $factor );
}
 
Line 595 ⟶ 596:
}
 
# Task routinesroutine
multi is-square-free (Int $n) { my @v = $n.&prime-factors.Bag.max(*.value)values; not @v.valuesum/@v > 1 ?? False !! True }
multi is-square-free (1) { True }
 
# The Task
# Parts 1 & 2
 
for 1, 145, 1e12.Int, 145+1e12.Int -> $start, $end {
# Part 1
say "Square─free\nSquare─free numbers between 1 $start and 145$end:\n";,
say (1$start ..145 $end).maphyper(:4batch).grep({ $_ if *.&is-square-free }).list.fmt("%3d").comb(10084).join("\n");
}
 
# Part 2
say "\nSquare─free numbers between 1000000000000 and 1000000000145:";
say (1000000000000..1000000000145).hyper(:4batch).map({ $_ if .&is-square-free }).list.comb(98).join("\n");
 
# Part 3
for 1e2, 1e3, 1e4, 1e5, 1e6 {
say "\nThe number of square─free numbers between 1 and {$_} (inclusive) is: ",
+(1 .. .Int).race.mapgrep: { 1 if *.&is-square-free };
}</lang>
{{out}}
<pre>
<pre>Square─free numbers between 1 and 145:
1 2 3 5 6 7 10 11 13 14 15 17 19 21 22 23 26 29 30 31 33 34 35 37 38
39 411 42 2 43 463 47 5 51 536 55 7 57 10 58 11 59 13 61 14 62 15 65 17 66 19 67 21 69 22 70 23 71 26 73 29 74 30 77 31 78 7933
8234 8335 8537 8638 8739 8941 9142 9343 9446 9547 9751 101 10253 103 10555 106 10757 109 11058 111 11359 114 11561 118 11962 65 66 67
69 70 71 73 74 77 78 79 82 83 85 86 87 89 91 93 94 95 97 101 102
122 123 127 129 130 131 133 134 137 138 139 141 142 143 145
103 105 106 107 109 110 111 113 114 115 118 119 122 123 127 129 130 131 133 134 137
138 139 141 142 143 145
 
Square─free numbers between 1000000000000 and 1000000000145:
1000000000001 1000000000002 1000000000003 1000000000005 1000000000006 1000000000007 1000000000009
1000000000009 1000000000011 1000000000013 1000000000014 1000000000015 1000000000018 1000000000019 1000000000021
1000000000019 1000000000021 1000000000022 1000000000023 1000000000027 1000000000029 1000000000030 1000000000031 1000000000033
1000000000030 1000000000031 1000000000033 1000000000037 1000000000038 1000000000039 1000000000041 1000000000042 1000000000043 1000000000045
1000000000041 1000000000042 1000000000043 1000000000045 1000000000046 1000000000047
1000000000046 1000000000047 1000000000049 1000000000051 1000000000054 1000000000055 1000000000057 1000000000058
1000000000058 1000000000059 1000000000061 1000000000063 1000000000065 1000000000066 1000000000067
1000000000069 1000000000070 1000000000073 1000000000074 1000000000077 1000000000078 1000000000079
1000000000079 1000000000081 1000000000082 1000000000085 1000000000086 1000000000087 1000000000090 1000000000091
1000000000090 1000000000091 1000000000093 1000000000094 1000000000095 1000000000097 1000000000099 1000000000101 1000000000102
1000000000103 1000000000105 1000000000106 1000000000109 1000000000111 1000000000113 1000000000114 ▼
1000000000099 1000000000101 1000000000102 1000000000103 1000000000105 1000000000106
1000000000115 1000000000117 1000000000118 1000000000119 1000000000121 1000000000122 1000000000123 ▼
▲1000000000103 1000000000105 1000000000106 1000000000109 1000000000111 1000000000113 1000000000114 1000000000115 1000000000117
1000000000126 1000000000127 1000000000129 1000000000130 1000000000133 1000000000135 1000000000137 ▼
▲1000000000115 1000000000117 1000000000118 1000000000119 1000000000121 1000000000122 1000000000123 1000000000126
▲1000000000126 1000000000127 1000000000129 1000000000130 1000000000133 1000000000135 1000000000137
1000000000138 1000000000139 1000000000141 1000000000142 1000000000145
 
Thundergnat
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