Sorting algorithms/Permutation sort: Difference between revisions
Rename Perl 6 -> Raku, alphabetize, minor clean-up
(→{{header|Python}}: Added cleaner Python 3 version, with more_itertools.window) |
Thundergnat (talk | contribs) (Rename Perl 6 -> Raku, alphabetize, minor clean-up) |
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While i < j
t := %v%%i%, %v%%i% := %v%%j%, %v%%j% := t, ++i, --j
}</lang>
=={{header|BBC BASIC}}==
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→ (0 1 2 3 4 5)
</lang>
=={{header|Elixir}}==
Line 1,290:
<pre>Before: 94 15 42 35 55 24 96 14 61 94 43
After: 14 15 24 35 42 43 55 61 94 94 96</pre>
=={{header|Perl 6}}==▼
<lang perl6># Lexicographic permuter from "Permutations" task.▼
sub next_perm ( @a ) {▼
my $j = @a.end - 1;▼
$j-- while $j >= 1 and [>] @a[ $j, $j+1 ];▼
my $aj = @a[$j];▼
my $k = @a.end;▼
$k-- while [>] $aj, @a[$k];▼
@a[ $j, $k ] .= reverse;▼
my Int $r = @a.end;▼
my Int $s = $j + 1;▼
while $r > $s {▼
@a[ $r, $s ] .= reverse;▼
$r--;▼
$s++;▼
}▼
}▼
sub permutation_sort ( @a ) {▼
my @n = @a.keys;▼
my $perm_count = [*] 1 .. +@n; # Factorial▼
for ^$perm_count {▼
my @permuted_a = @a[ @n ];▼
return @permuted_a if [le] @permuted_a;▼
next_perm(@n);▼
}▼
}▼
my @data = < c b e d a >; # Halfway between abcde and edcba▼
say 'Input = ' ~ @data;▼
say 'Output = ' ~ @data.&permutation_sort;▼
</lang>▼
{{out}}▼
<pre>Input = c b e d a▼
Output = a b c d e</pre>▼
=={{header|Phix}}==
Line 1,578 ⟶ 1,538:
(sort '(6 1 5 2 4 3)) ; => '(1 2 3 4 5 6)
</lang>
(formerly Perl 6)
▲<lang perl6># Lexicographic permuter from "Permutations" task.
▲sub next_perm ( @a ) {
▲ my $j = @a.end - 1;
▲ $j-- while $j >= 1 and [>] @a[ $j, $j+1 ];
▲ my $aj = @a[$j];
▲ my $k = @a.end;
▲ $k-- while [>] $aj, @a[$k];
▲ @a[ $j, $k ] .= reverse;
▲ my Int $r = @a.end;
▲ my Int $s = $j + 1;
▲ while $r > $s {
▲ @a[ $r, $s ] .= reverse;
▲ $r--;
▲ $s++;
▲ }
▲}
▲sub permutation_sort ( @a ) {
▲ my @n = @a.keys;
▲ my $perm_count = [*] 1 .. +@n; # Factorial
▲ for ^$perm_count {
▲ my @permuted_a = @a[ @n ];
▲ return @permuted_a if [le] @permuted_a;
▲ next_perm(@n);
▲ }
▲}
▲my @data = < c b e d a >; # Halfway between abcde and edcba
▲say 'Input = ' ~ @data;
▲say 'Output = ' ~ @data.&permutation_sort;
▲</lang>
▲{{out}}
▲<pre>Input = c b e d a
▲Output = a b c d e</pre>
=={{header|REXX}}==
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