2023 Day 23 Complete!
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@ -2,138 +2,195 @@ package main
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import (
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"fmt"
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"os"
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h "git.bullercodeworks.com/brian/adventofcode/helpers"
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)
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func main() {
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inp := h.StdinToStringSlice()
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if len(os.Args) == 1 || os.Args[1] != "-p2" {
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part1(inp)
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}
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if len(os.Args) == 1 {
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fmt.Println()
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}
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if len(os.Args) == 1 || os.Args[1] != "-p1" {
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part2(inp)
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}
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part1(inp)
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fmt.Println()
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part2(inp)
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}
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var history map[string]int
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func part1(input []string) {
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history = make(map[string]int)
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m := h.StringSliceToCoordByteMap(input)
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start, _ := m.FindFirst('.')
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start.Y++
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end, _ := m.FindLast('.')
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func part1(inp []string) {
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fmt.Println("# Part 1")
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fmt.Println(len(findPath(&m, start, end, []h.Coordinate{})))
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start, end := h.Coordinate{}, h.Coordinate{}
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start.X, start.Y = findStart(inp)
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end.X, end.Y = findEnd(inp)
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visited := map[h.Coordinate]int{start: 0}
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currentDir := S
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walk(inp, start, currentDir, visited)
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fmt.Println(visited[end])
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}
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func part2(input []string) {
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history = make(map[string]int)
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m := h.StringSliceToCoordByteMap(input)
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start, _ := m.FindFirst('.')
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start.Y++
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end, _ := m.FindLast('.')
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m.ReplaceAll('^', '.')
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m.ReplaceAll('>', '.')
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m.ReplaceAll('v', '.')
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m.ReplaceAll('<', '.')
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func part2(inp []string) {
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fmt.Println("# Part 2")
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fmt.Println(len(findPath(&m, start, end, []h.Coordinate{})))
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start, end := h.Coordinate{}, h.Coordinate{}
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start.X, start.Y = findStart(inp)
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end.X, end.Y = findEnd(inp)
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conns := getConnections(inp)
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conns[start] = true
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conns[end] = true
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paths := getPaths(inp, conns)
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visited := make([]bool, len(conns))
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visited[paths[start][0].index] = true
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fmt.Println(part2Walk(inp, paths, start, end, 0, visited))
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}
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func findPath(m *h.CoordByteMap, pos h.Coordinate, end h.Coordinate, path []h.Coordinate) []h.Coordinate {
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ret := []h.Coordinate{pos}
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if pos.Equals(end) {
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//printPath(m, pos, path)
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//time.Sleep(time.Second / 20)
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return ret
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var (
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N = h.Coordinate{X: 0, Y: -1}
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E = h.Coordinate{X: 1, Y: 0}
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S = h.Coordinate{X: 0, Y: 1}
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W = h.Coordinate{X: -1, Y: 0}
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dirs = []h.Coordinate{N, E, S, W}
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badSlope = map[h.Coordinate]byte{
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N: 'v', E: '<', S: '^', W: '>',
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}
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)
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path = append(path, pos)
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switch m.Get(pos) {
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case '^':
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if inPath(pos.North(), path) {
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return ret
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} else {
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return append(ret, findPath(m, pos.North(), end, path)...)
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}
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case '>':
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if inPath(pos.East(), path) {
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return ret
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} else {
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return append(ret, findPath(m, pos.East(), end, path)...)
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}
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case 'v':
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if inPath(pos.South(), path) {
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return ret
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} else {
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return append(ret, findPath(m, pos.South(), end, path)...)
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}
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case '<':
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if inPath(pos.West(), path) {
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return ret
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} else {
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return append(ret, findPath(m, pos.West(), end, path)...)
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func getLeft(from h.Coordinate) h.Coordinate {
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switch {
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case from.Equals(N):
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return W
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case from.Equals(E):
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return N
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case from.Equals(S):
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return E
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default:
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return S
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}
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}
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func getRight(from h.Coordinate) h.Coordinate {
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switch {
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case from.Equals(N):
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return E
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case from.Equals(E):
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return S
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case from.Equals(S):
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return W
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default:
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return N
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}
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}
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func findStart(inp []string) (int, int) {
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y := 0
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for x := 0; x < len(inp[0]); x++ {
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if inp[y][x] == '.' {
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return x, y
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}
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}
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return -1, -1
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}
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var longestPath []h.Coordinate
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longest := h.MIN_INT
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for _, chk := range []h.Coordinate{pos.North(), pos.East(), pos.South(), pos.West()} {
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if m.Get(chk) == '#' || inPath(chk, path) || !m.ContainsCoord(chk) {
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continue
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func findEnd(inp []string) (int, int) {
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y := len(inp) - 1
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for x := 0; x < len(inp[0]); x++ {
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if inp[y][x] == '.' {
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return x, y
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}
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}
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return -1, -1
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}
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var run bool
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var v int
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if v, run = history[chk.String()]; run {
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run = v < len(path)+1
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}
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if run {
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history[chk.String()] = len(path) + 1
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chkPath := append(ret, findPath(m, chk, end, path)...)
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if inPath(end, chkPath) && len(chkPath) > longest {
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longest = len(chkPath)
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longestPath = chkPath
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func isValidCoord(inp []string, c h.Coordinate) bool {
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return c.Y >= 0 && c.Y < len(inp) && c.X >= 0 && c.X < len(inp[0])
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}
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func walk(inp []string, start, currDir h.Coordinate, visited map[h.Coordinate]int) {
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curr := start
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currStep := visited[curr]
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for _, dir := range []h.Coordinate{currDir, getLeft(currDir), getRight(currDir)} {
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next := h.Coordinate{X: (curr.X + dir.X), Y: (curr.Y + dir.Y)}
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if isValidCoord(inp, next) && inp[next.Y][next.X] != '#' {
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bt := inp[next.Y][next.X]
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if badSlope[dir] == bt {
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continue
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}
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if val, found := visited[next]; !found || val < currStep+1 {
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visited[next] = currStep + 1
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walk(inp, next, dir, visited)
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}
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}
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}
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return longestPath
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}
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func inPath(pos h.Coordinate, path []h.Coordinate) bool {
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for _, chk := range path {
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if chk.Equals(pos) {
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return true
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}
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}
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return false
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}
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func printPath(m *h.CoordByteMap, pos h.Coordinate, path []h.Coordinate) {
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limit := (m.BRY - m.TLY) > 30
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fmt.Print(h.CLEAR_SCREEN)
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for y := m.TLY; y <= m.BRY; y++ {
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if limit && h.Abs(pos.Y-y) > 15 {
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continue
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}
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for x := m.TLX; x <= m.BRX; x++ {
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chk := h.Coordinate{X: x, Y: y}
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if chk.Equals(pos) {
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fmt.Print("@")
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} else {
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if inPath(chk, path) {
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fmt.Print("O")
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} else {
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fmt.Print(string(m.Get(chk)))
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func getConnections(inp []string) map[h.Coordinate]bool {
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conns := map[h.Coordinate]bool{}
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for y, line := range inp {
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for x, bt := range line {
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if bt == '#' {
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continue
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}
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pos := h.Coordinate{X: x, Y: y}
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neighbors := 0
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for _, nbr := range pos.GetOrthNeighbors() {
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if isValidCoord(inp, nbr) && inp[nbr.Y][nbr.X] != '#' {
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neighbors++
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}
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}
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if neighbors > 2 {
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conns[pos] = true
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}
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}
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fmt.Println()
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}
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return conns
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}
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type Path struct {
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end h.Coordinate
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length, index int
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}
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func getPaths(inp []string, conns map[h.Coordinate]bool) map[h.Coordinate][]Path {
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paths := map[h.Coordinate][]Path{}
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connIdx := 0
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for c := range conns {
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for _, d := range dirs {
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curr := h.Coordinate{X: c.X + d.X, Y: c.Y + d.Y}
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if isValidCoord(inp, curr) && inp[curr.Y][curr.X] != '#' {
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path := getPath(inp, c, curr, d, 1, conns)
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path.index = connIdx
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paths[c] = append(paths[c], path)
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}
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}
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connIdx++
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}
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return paths
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}
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func getPath(inp []string, start, curr, dir h.Coordinate, length int, conns map[h.Coordinate]bool) Path {
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for _, dir := range []h.Coordinate{dir, getLeft(dir), getRight(dir)} {
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next := h.Coordinate{X: curr.X + dir.X, Y: curr.Y + dir.Y}
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if inp[next.Y][next.X] != '#' {
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if _, found := conns[next]; found {
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return Path{next, length + 1, 0}
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} else {
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return getPath(inp, start, next, dir, length+1, conns)
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}
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}
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}
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return Path{
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end: h.Coordinate{X: -1, Y: -1},
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length: 0, index: 0,
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}
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}
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func part2Walk(inp []string, paths map[h.Coordinate][]Path, start, end h.Coordinate, step int, visited []bool) int {
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var max int
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for _, path := range paths[start] {
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if path.end == end {
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return step + path.length
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}
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index := paths[path.end][0].index
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if !visited[index] {
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visited[index] = true
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max = h.Max(max, part2Walk(inp, paths, path.end, end, step+path.length, visited))
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visited[index] = false
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}
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}
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return max
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}
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@ -1,10 +1,10 @@
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package aoc
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type Queue[T comparable] struct {
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type Queue[T any] struct {
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items []T
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}
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func NewQueue[T comparable](items []T) *Queue[T] {
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func NewQueue[T any](items []T) *Queue[T] {
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return &Queue[T]{
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items: items,
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}
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@ -46,14 +46,18 @@ func (q *Queue[T]) Cut(at, count int) []T {
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q.items = append(q.items[:at], q.items[at+count:]...)
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return ret
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}
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func (q *Queue[T]) Delete(item T) {
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for i := range q.items {
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if q.items[i] == item {
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q.items = append(q.items[:i], q.items[i+1:]...)
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return
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}
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}
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func (q *Queue[T]) DeleteAt(idx int) {
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q.items = append(q.items[:idx], q.items[idx+1:]...)
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}
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// func (q *Queue[T]) Delete(item T) {
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// for i := range q.items {
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// if q.items[i] == item {
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// q.items = append(q.items[:i], q.items[i+1:]...)
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// return
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// }
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// }
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// }
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func (q *Queue[T]) Expand(at, by int) {
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q.items = append(q.items[:at], append(make([]T, by), q.items[at:]...)...)
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}
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