day 3, esay peazy, regexp + awk

d03/run.awk

@@ -0,0 +1,26 @@
+# run with
+# grep -oP 'mul\([0-9]+[,][0-9]+\)|do\(\)|don.?t\(\)' input | tr '(,)' '\t\t\t' | awk -f this.awk
+
+BEGIN {
+	run = 1
+}
+
+$1 == "mul" {
+	m = $2 * $3
+	P1 += m
+	if (run) {
+		P2 += m
+	}
+}
+
+$1 == "don't" {
+	run = 0
+}
+
+$1 == "do" {
+	run = 1
+}
+
+END {
+	print P1, P2
+}