22.pl: cleaner version

diff --git a/22.pl b/22.pl
index 221c686657d3b9ea64fa25abf37a380ae896d95d..991567533af736a3be46f10f0387b6f66c40e8db 100755 (executable)
--- a/22.pl
+++ b/22.pl
@@ -4,43 +4,36 @@ use v5.16;
 
 my @m = map { chomp; [ split // ] } <>;
 
-my $sum;
 my $step = 0;
 while (++$step) {
-       my %f;
-       my @q;
+       my (%f, @q);
        for my $x (0 .. 9) {
        for my $y (0 .. 9) {
-               next if $f{$x,$y};
                next if ++$m[$y][$x] < 10;
                $f{$x,$y} = 1;
-               push @q, [$x,$y];
-               say "flashed:$x,$y";
+               push @q, [$x, $y];
        } }
-       while (@q) {
-               my $p = shift @q;
-               my ($x2, $y2) = @$p;
+       while (my $p = shift @q) {
+               my ($x, $y) = @$p;
 
                for my $dx (-1 .. 1) {
                for my $dy (-1 .. 1) {
-                       next if $dx == 0 && $dy == 0;
-                       next if $x2+$dx < 0 || $x2+$dx > 9;
-                       next if $y2+$dy < 0 || $y2+$dy > 9;
-                       next if $f{$x2+$dx,$y2+$dy};
-                       say $x2+$dx, ',', $y2+$dy, ' >',$m[$y2+$dy][$x2+$dx];
-                       next if ++$m[$y2+$dy][$x2+$dx] < 10;
-                       $f{$x2+$dx,$y2+$dy} = 1;
-                       push @q, [$x2+$dx, $y2+$dy];
-                       say "flashed ", $x2+$dx,',',$y2+$dy;
+                       my ($x2, $y2) = ($x+$dx, $y+$dy);
+                       next if $x2 < 0 || $x2 > 9;
+                       next if $y2 < 0 || $y2 > 9;
+                       next if $f{$x2,$y2};
+                       next if ++$m[$y2][$x2] < 10;
+                       $f{$x2,$y2} = 1;
+                       push @q, [$x2, $y2];
                } }
        }
        for my $p (keys %f) {
                my ($x, $y) = split /$;/, $p;
                $m[$y][$x] = 0;
        }
-       say "Step $_ flashes ", scalar keys %f;
+       say "Step $step flashes ", scalar keys %f;
        say join("\n", map { join('', @$_) } @m);
-       say;
+       say '';
        last if keys %f == 100;
 }