39 lines
597 B
Perl
39 lines
597 B
Perl
use 5.20.0;
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use Math::Vector::Real;
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use experimental qw/ postderef signatures /;
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my @d = map { V(@$_) } [ -1,0], [0,1],[1,0],[0,-1];
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my $di = 0;
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my %grid;
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my ($i,$j) = (0,0);
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for my $r( <> ) {
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$j = 0;
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chomp $r;
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for ( split '', $r ) {
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$grid{$i}{$j++} = $_;
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}
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$i++;
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}
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use DDP;
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p %grid;
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my $coord = V(12,12);
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my $sum;
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for(1..10_000){
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my $infected = $grid{$coord->[0]}{$coord->[1]} eq '#';
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$di += $infected ? 1 : 3;
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$di %= 4;
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$grid{$coord->[0]}{$coord->[1]} = $infected ? '.' : '#';
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$sum++ unless $infected;
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$coord += $d[$di];
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}
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say $sum;
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