day 10, awk solution for part 1

d10/part1.awk

@@ -0,0 +1,13 @@
+BEGIN { x=1 }
+function inc() {
+	c+=1
+	if (index("20,60,100,140,180,220,", c ",")>0) {
+		S += x*c
+	}
+}
+{ inc() }
+$1 == "addx" {
+	inc()
+	x+=$2
+}
+END { print S }