day 10, part 2, no need to buffer, spare 10 loc

d10/part2.awk

@@ -1,20 +1,10 @@
-BEGIN { x=1 }
 function inc() {
-  i = (c%40)
-	A[c+1] = (i==x-1||i==x||i==x+1) ? "█" : "░"
-	c+=1
+	i = (c++%40)
+	printf "%s", (i==x||i==x+1||i==x+2) ? "█" : " "
+	printf "%s", (i==39) ? "\n" : ""
 }
 { inc() }
 $1 == "addx" {
 	inc()
-	x+=$2
-}
-END {
-	for (i=0;i<=5;i++) {
-		r = ""
-		for (j=1;j<=40;j++) {
-			r = r A[i*40+j]
-		}
-		print r
-	}
+	x += $2
 }