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Initial data commit

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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Sorting-algorithms-Permutation-sort/Raku/sorting-algorithms-permutation-sort.raku Normal file
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# 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;