day 3, compact form

d03/run.awk

@@ -1,26 +1,7 @@
 # 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
-}
+# grep -oP 'mul\([0-9]+[,][0-9]+\)|do\(\)|don.t\(\)' input | tr '(,)' '\t\t\t' | awk -f this.awk
+BEGIN {run=1}
+$1=="mul" {P1+=$2*$3; P2+=run*$2*$3}
+$1=="don't" {run=0}
+$1=="do" {run=1}
+END {print P1, P2}