day6

2015/06/input.txt

@@ -0,0 +1,300 @@
+turn off 660,55 through 986,197
+turn off 341,304 through 638,850
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+toggle 322,558 through 977,958
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+toggle 424,675 through 740,862
+toggle 580,592 through 671,900
+toggle 296,687 through 906,775

2015/06/lights.pl

@@ -0,0 +1,30 @@
+use 5.20.0;
+
+my $grid = [];
+
+while(<>) {
+    warn $_;
+    /
+        (?<command>on|off|toggle)
+        .*?
+        (?<from_x>\d+),
+        (?<from_y>\d+)
+        .*?
+        (?<to_x>\d+),
+        (?<to_y>\d+)
+    /x;
+
+    for my $x ( $+{from_x}..$+{to_x} ) {
+        for my $y ( $+{from_y}..$+{to_y} ) {
+            $grid->[$x][$y] = 
+                $+{command} eq 'on' ? 1
+                :$+{command} eq 'off' ? 0
+                : !$grid->[$x][$y];
+ 
+        }
+    }
+}
+
+use List::AllUtils qw/ sum /;
+
+say sum map { $_  ? @$_ : () } @$grid;

2015/06/lights2.pl

@@ -0,0 +1,28 @@
+use List::AllUtils qw/ sum max /;
+
+use 5.20.0;
+
+my $grid = [];
+
+while(<>) {
+    warn $_;
+    /
+        (?<command>on|off|toggle)
+        .*?
+        (?<from_x>\d+),
+        (?<from_y>\d+)
+        .*?
+        (?<to_x>\d+),
+        (?<to_y>\d+)
+    /x;
+
+    my $level = $+{command} eq 'on' ? 1 : $+{command} eq 'off' ? -1 : 2;
+
+    for my $x ( $+{from_x}..$+{to_x} ) {
+        for my $y ( $+{from_y}..$+{to_y} ) {
+            $grid->[$x][$y] = max 0, $grid->[$x][$y] + $level;
+        }
+    }
+}
+
+say sum map { $_  ? @$_ : () } @$grid;