7 lines
217 B
Perl
7 lines
217 B
Perl
sub permutation {
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my ($perm,@set) = @_;
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print "$perm\n" || return unless (@set);
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permutation($perm.$set[$_],@set[0..$_-1],@set[$_+1..$#set]) foreach (0..$#set);
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}
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my @input = (qw/a b c d/);
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permutation('',@input);
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