Moving to more powerful system

2017/day16/day16.go

@@ -0,0 +1,86 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	var progs string
+	length := 16
+	iters := 1000000000
+	if len(os.Args) > 1 {
+		length = Atoi(os.Args[1])
+	}
+	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)
+		}
+		progs = doDance(progs, moves)
+	}
+	fmt.Println(progs)
+}
+
+func doDance(progs string, moves []string) string {
+	for _, v := range moves {
+		switch v[0] {
+		case 's':
+			progs = Spin(progs, Atoi(v[1:]))
+		case 'p':
+			pts := strings.Split(v[1:], "/")
+			progs = Partner(progs, pts[0], pts[1])
+		case 'x':
+			pts := strings.Split(v[1:], "/")
+			progs = Exchange(progs, Atoi(pts[0]), Atoi(pts[1]))
+		}
+	}
+	return progs
+}
+
+func Spin(progs string, cnt int) string {
+	stSpin := len(progs) - cnt
+	return progs[stSpin:] + progs[:stSpin]
+}
+
+func Exchange(progs string, i1, i2 int) string {
+	if i1 > i2 {
+		i1, i2 = i2, i1
+	}
+	return progs[:i1] + string(progs[i2]) + progs[i1+1:i2] + string(progs[i1]) + progs[i2+1:]
+}
+
+func Partner(progs string, p1, p2 string) string {
+	return Exchange(progs, strings.Index(progs, p1), strings.Index(progs, p2))
+}
+
+func StdinToString() string {
+	var input string
+	scanner := bufio.NewScanner(os.Stdin)
+	for scanner.Scan() {
+		input = scanner.Text()
+	}
+	return input
+}
+
+func Atoi(i string) int {
+	var ret int
+	var err error
+	if ret, err = strconv.Atoi(i); err != nil {
+		log.Fatal("Invalid Atoi")
+	}
+	return ret
+}

2017/day16/testinput

@@ -0,0 +1 @@
+s1,x3/4,pe/b