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