adventofcode/2017/10/1.pl

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Perl
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2017-12-11 15:33:28 +00:00
use 5.20.0;
my @commands = split ',', scalar <>;
my $skip = 0;
my $i = 0;
my @array = 0..255;
for my $c ( @commands ) {
@array[0..$c-1] = @array[ reverse 0..$c-1];
push @array, shift @array for 1..$c + $skip++;
$i += $c + $skip-1;
say "@array";
warn "index: $i";
}
warn $i;
unshift @array, pop @array for 1..($i%@array);
say "@array";
say $array[0] * $array[1];