From 4bfec4870405d2472f7d7bd82f42b20b920d5fe3 Mon Sep 17 00:00:00 2001
From: "Jan \"Yenya\" Kasprzak" <kas@fi.muni.cz>
Date: Sat, 11 Dec 2021 06:53:17 +0100
Subject: [PATCH] 22.pl: cleaner version

---
 22.pl | 33 +++++++++++++--------------------
 1 file changed, 13 insertions(+), 20 deletions(-)

diff --git a/22.pl b/22.pl
index 221c686..9915675 100755
--- 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;
 }
 
-- 
2.43.5