10 lines
359 B
Perl
10 lines
359 B
Perl
sub check_perm {
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my %hash; @hash{@_} = ();
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for my $s (@_) { exists $hash{$_} or return $_
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for map substr($s,1) . substr($s,0,1), (1..length $s); }
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}
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# Check and display
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@perms = qw(ABCD CABD ACDB DACB BCDA ACBD ADCB CDAB DABC BCAD CADB CDBA
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CBAD ABDC ADBC BDCA DCBA BACD BADC BDAC CBDA DBCA DCAB);
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print check_perm(@perms), "\n";
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