37 lines
729 B
Perl
37 lines
729 B
Perl
use 5.20.0;
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use lib '.';
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use hash;
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my $key = 'stpzcrnm';
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use List::AllUtils qw/ sum /;
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my @grid =
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map { [ map { $_ ? '#' : ' ' } map { split '', sprintf "%04b", hex } split '' ] }
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map { knot_hash( join '-', $key, $_) } 0..127;
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my $clusters;
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for my $x ( 0..127 ) {
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for my $y ( 0..127 ) {
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$clusters+= eradicate(\@grid,$x,$y);
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}
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}
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say $clusters;
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use experimental qw/ signatures /;
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sub eradicate($grid,$i,$j) {
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return 0 if $grid->[$i][$j] ne '#';
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$grid->[$i][$j] = ' ';
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eradicate($grid,$i-1,$j) if $i > 0;
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eradicate($grid,$i,$j-1) if $j > 0;
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eradicate($grid,$i+1,$j);
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eradicate($grid,$i,$j+1);
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return 1;
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}
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sub print_g {
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say @$_ for @grid;
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}
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