2017 Day 16 & Day 17 Complete

2017/day16/day16.go

@@ -15,24 +15,33 @@ func main() {
 	iters := 1000000000
 	if len(os.Args) > 1 {
 		length = Atoi(os.Args[1])
+		if len(os.Args) > 2 {
+			iters = Atoi(os.Args[2])
+		}
 	}
+
+	// Create a starting string
 	for i := 0; i < length; i++ {
 		progs += string('a' + i)
 	}
+
 	inp := StdinToString()
 	moves := strings.Split(inp, ",")
-	for i := 0; i < iters; i++ {
-		if i%(iters/100) == 0 {
-			// Clear the screen
-			fmt.Print("\033[H\033[2J")
-			// Percent Complete
-			fResult := ((float64(i) / float64(iters)) * 100)
-			sResult2 := strconv.FormatFloat(fResult, 'f', 2, 64)
-			fmt.Println(sResult2)
+
+	var loopEnd int
+	var state []string
+	doneProgs := progs
+	state = append(state, progs)
+	for loopEnd = 1; loopEnd < (iters / 2); loopEnd++ {
+		doneProgs = doDance(doneProgs, moves)
+		state = append(state, doneProgs)
+		if doneProgs == progs {
+			fmt.Println("Loops at", loopEnd)
+			pos := (iters / loopEnd) * loopEnd
+			fmt.Println("Final State", state[iters-pos])
+			break
 		}
-		progs = doDance(progs, moves)
 	}
-	fmt.Println(progs)
 }
 
 func doDance(progs string, moves []string) string {