33 lines
625 B
Perl
33 lines
625 B
Perl
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use 5.20.0;
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use List::UtilsBy qw/ sort_by /;
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use List::AllUtils qw/ sum /;
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use experimental qw/ signatures /;
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my @real = grep { is_real($_) } <>;
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my @alphabet = ( 'a'..'z' );
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say $_, ": ", decrypt($_) for @real;
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sub decrypt($line) {
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$line =~ s/(\d+).*$//;
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my $checksum = $1;
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$line =~ s/-/ /g;
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$line =~ s/([a-z])/ $alphabet[ ( ord( $1 ) - ord( 'a' ) + $checksum ) % @alphabet ]/eg;
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$line;
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}
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sub is_real ( $line ) {
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$line =~ s/\[(.*?)\]//;
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my $checksum = $1;
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$checksum eq join '', ( sort_by {
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sprintf "%03d%s", 999 - (eval "\$line =~ y/$_/$_/"), $_
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} 'a'..'z' )[0..4];
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}
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