Combine AoC Repos

2015/day10/main.go

@@ -0,0 +1,76 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+)
+
+func printUsage() {
+	fmt.Println("Usage: day10 <look-and-say> [iterations]")
+	os.Exit(1)
+}
+
+/* Pt 2 Result:
+Length of result: 5103798
+*/
+func main() {
+	var debugMode bool
+
+	args := os.Args
+	if len(args) < 2 {
+		printUsage()
+	}
+	var lasString string
+	lasString = args[1]
+
+	var iter int
+	var err error
+	if len(args) > 2 {
+		if iter, err = strconv.Atoi(args[2]); err != nil {
+			printUsage()
+		}
+	} else {
+		iter = 40
+	}
+	if len(args) > 3 {
+		if args[2] == "--debug" {
+			debugMode = true
+		}
+	}
+
+	fmt.Printf("Iterate %d times over %s\n", iter, lasString)
+	for i := 0; i < iter; i++ {
+		fmt.Print("O")
+		if i%10 == 9 {
+			fmt.Println(" " + strconv.Itoa(len(lasString)))
+		}
+		r := lookAndSay(lasString)
+		if debugMode {
+			fmt.Println(strconv.Itoa(i) + " >> " + r)
+		}
+		lasString = r
+	}
+	fmt.Println("\nLength of result: " + strconv.Itoa(len(lasString)))
+}
+
+func lookAndSay(str string) string {
+	numI := 1
+	var ret string
+
+	strLen := len(str)
+
+	for i := range str {
+		if strLen > i+1 {
+			if str[i+1] != str[i] {
+				ret += strconv.Itoa(numI) + string(str[i])
+				numI = 0
+			}
+		} else {
+			// Last char in string
+			ret += strconv.Itoa(numI) + string(str[i])
+		}
+		numI++
+	}
+	return ret
+}