Days 7,8,9

2023/gareth/day08/day08.go

@@ -0,0 +1,99 @@
+package day08
+
+import (
+	"fmt"
+	"math"
+	"regexp"
+	"strings"
+)
+
+type Direction struct {
+	Destination string
+	Left        string
+	Right       string
+}
+
+func Part1(input string) int {
+	lines := strings.Split(input, "\r\n")
+	dir := make(map[string]Direction)
+	for _, line := range lines {
+		pattern := `[A-Z]+`
+		re := regexp.MustCompile(pattern)
+		matches := re.FindAllString(line, -1)
+		dir[matches[0]] = Direction{matches[0], matches[1], matches[2]}
+	}
+
+	currentloc := "AAA"
+	m := "LRLRRLLRRLRRRLRLRRRLLRRLLLLRRRLRRRLRRLRRLRRRLRRRLLRRLRLRRLRRRLLLRRLRRLLRLLRRRLRRRLLRLRRRLRLLRRLLLRLRRRLRRRLRRRLLRLRRRLLRRLRLRLLRRLRRRLRRLRLLRLRRRLRRLRLRLRRLRRRLRRRLRRRLRRLRRRLLRRLRRLLRRRLLRLRLRLRLLLRRLRLRRLRRLRRLRRLRRRLRRRLRLRRRLRLRRRLRRLRLLRLRRLRLRLLLRLLLRRRLRRLLLRLRRRR"
+	moves := strings.Split(m, "")
+	moveIndex := 0
+	total := 0
+	for {
+		move := moves[moveIndex]
+		if move == "R" {
+			currentloc = dir[currentloc].Right
+		} else {
+			currentloc = dir[currentloc].Left
+		}
+		total++
+		if currentloc == "ZZZ" {
+			return total
+		}
+		moveIndex = int(math.Mod(float64(moveIndex+1), float64(len(moves))))
+	}
+	return -1
+}
+
+func Part2(input string) int {
+	lines := strings.Split(input, "\r\n")
+	dir := make(map[string]Direction)
+	for _, line := range lines {
+		pattern := `[A-Z1-9]+`
+		re := regexp.MustCompile(pattern)
+		matches := re.FindAllString(line, -1)
+		dir[matches[0]] = Direction{matches[0], matches[1], matches[2]}
+	}
+	var startingLoc []string
+	for _, loc := range dir {
+		des := loc.Destination
+		if des[2] == 'A' {
+			startingLoc = append(startingLoc, des)
+		}
+	}
+
+	m := "LRLRRLLRRLRRRLRLRRRLLRRLLLLRRRLRRRLRRLRRLRRRLRRRLLRRLRLRRLRRRLLLRRLRRLLRLLRRRLRRRLLRLRRRLRLLRRLLLRLRRRLRRRLRRRLLRLRRRLLRRLRLRLLRRLRRRLRRLRLLRLRRRLRRLRLRLRRLRRRLRRRLRRRLRRLRRRLLRRLRRLLRRRLLRLRLRLRLLLRRLRLRRLRRLRRLRRLRRRLRRRLRLRRRLRLRRRLRRLRLLRLRRLRLRLLLRLLLRRRLRRLLLRLRRRR"
+	moves := strings.Split(m, "")
+	moveIndex := 0
+	startingLocIndex := 0
+	currentloc := ""
+	total := 0
+	for {
+		for _, loc := range startingLoc {
+			currentloc = loc
+			move := moves[moveIndex]
+			if move == "R" {
+				currentloc = dir[currentloc].Right
+			} else {
+				currentloc = dir[currentloc].Left
+			}
+			startingLoc[startingLocIndex] = currentloc
+			startingLocIndex = int(math.Mod(float64(startingLocIndex+1), float64(len(startingLoc))))
+		}
+		total++
+		endFlag := false
+		for _, loc := range startingLoc {
+			if loc[2] == 'Z' {
+				endFlag = true
+			} else {
+				endFlag = false
+				break
+			}
+		}
+		if endFlag == true {
+			return total
+		}
+		moveIndex = int(math.Mod(float64(moveIndex+1), float64(len(moves))))
+		fmt.Println(total)
+	}
+	return -2
+}