1 files changed, 15 insertions, 0 deletions
diff --git a/2015/06/puzzle-1.awk b/2015/06/puzzle-1.awk
new file mode 100755
index 0000000..97165cf
--- /dev/null
+++ b/2015/06/puzzle-1.awk
@@ -0,0 +1,15 @@
+#!/usr/bin/env -S awk -f
+
+function setlights(val, toggle)
+{
+	for (i = from[1]; i <= to[1]; i++) {
+		for (j = from[2]; j <= to[2]; j++)
+			lights[i][j] = toggle ? (lights[i][j] ? 0 : 1) : val
+	}
+}
+
+$1 == "toggle" { split($2, from, ","); split($4, to, ","); setlights(0, 1) }
+$2 ~ /on|off/  { split($3, from, ","); split($5, to, ",") }
+$2 == "on"     { setlights(1, 0) }
+$2 == "off"    { setlights(0, 0) }
+END            { for (i = 0; i <= 999; i++) for (j = 0; j <= 999; j++) count += lights[i][j]; print count }