58 lines
1.1 KiB
Perl
58 lines
1.1 KiB
Perl
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use 5.20.0;
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use List::AllUtils qw/ min sum /;
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my @grid = map { [ split '' ] } map { chomp; $_ } <>;
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use DDP;
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@grid = iteration(@grid) for 1..100;
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say sum map { $_ eq '#' } map { @$_ } @grid;
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sub iteration {
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my @grid = @_;
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#say join ' ', @$_ for @grid;
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#say;
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my $size = @grid-1;
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my @new_grid;
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for my $x ( 0..$size ) {
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for my $y ( 0..$size ) {
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my $neig = neighbors(\@grid,$x,$y);
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if( $grid[$x][$y] eq '#' ) {
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$new_grid[$x][$y] = $neig ~~ [ 2,3] ? '#' : '.';
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}
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else {
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$new_grid[$x][$y] = $neig == 3 ? '#' : '.';
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}
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}
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}
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$new_grid[0][0] = $new_grid[$size][0] = $new_grid[0][$size] = $new_grid[$size][$size] = '#';
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return @new_grid;
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}
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sub neighbors {
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my( $grid, $x, $y ) = @_;
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my $sum;
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for my $i ( -1..1 ) {
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for my $j ( -1..1 ) {
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next if !$i and !$j;
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my($m,$n) = ($x+$i,$y+$j);
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next if 0 > min $m, $n;
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$sum += $grid->[$m][$n] eq '#';
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}
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}
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return $sum;
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}
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