adventofcode/2015/19/2.pl

54 lines
852 B
Perl

use 5.20.0;
use List::AllUtils qw/ uniq /;
my @lines = <>;
chomp for @lines;
my $sequence = pop @lines;
pop @lines;
my %mutation = reverse map { split ' => ' } @lines;
my $steps = 0;
my @possible = ( $sequence );
my %s = ( $sequence => 0 );
while( not $s{e} ) {
use DDP;
warn scalar @possible;
my $n = shift @possible;
warn $n;
my @new = mutate($n);
for(@new) {
next if exists $s{$_};
$s{$_} = $s{$n}+1;
push @possible, $_;
}
@possible = sort { length $a <=> length $b } @possible;
}
say $s{e};
use experimental 'signatures';
sub mutate($sequence) {
my @molecules;
while( my( $from, $to ) = each %mutation ) {
# warn $from;
while( $sequence =~ /\G(.*?)($from)/g ) {
push @molecules, $` . $1 . $to . $'
}
}
return @molecules;
}