2024 Day 16 Complete!
This commit is contained in:
parent
5cfe4e1b65
commit
5ae4d0ca9b
@ -1,17 +1,94 @@
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package main
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import (
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"errors"
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"fmt"
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"math"
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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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part1(inp)
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// fmt.Println()
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// part2(inp)
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inp := h.StdinToCoordMap()
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start, _ := inp.FindFirst('S')
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end, _ := inp.FindFirst('E')
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score, seats := bfs(inp, start, end)
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fmt.Println("# Part 1")
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fmt.Println("Minimum Score:", score)
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fmt.Println("# Part 2")
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fmt.Println("Best Seats:", seats)
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}
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func bfs(inp h.CoordByteMap, s, e h.Coordinate) (int, int) {
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start := CD{c: s, d: E}
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minScore := math.MaxInt
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queue := []State{
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{
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pos: start,
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path: []h.Coordinate{},
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},
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}
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visited := make(map[CD]int)
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sizeToC := make(map[int][]h.Coordinate)
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for len(queue) > 0 {
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currState := queue[0]
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queue = queue[1:]
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if currState.score > minScore {
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continue
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}
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if currState.pos.c.Equals(e) {
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if currState.score <= minScore {
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minScore = currState.score
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sizeToC[minScore] = append(sizeToC[minScore], currState.path...)
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}
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continue
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}
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for _, n := range currState.pos.GetNeighbors() {
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if inp.Get(n.c) == '#' {
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continue
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}
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score := currState.score + 1
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if currState.pos.d != n.d {
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score += 1000
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}
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if prev, ok := visited[n]; ok {
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if prev < score {
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continue
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}
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}
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visited[n] = score
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np := make([]h.Coordinate, len(currState.path))
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copy(np, currState.path)
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queue = append(queue, State{
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pos: n,
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path: append(np, n.c),
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score: score,
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})
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}
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}
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seatMap := make(map[h.Coordinate]bool)
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for _, p := range sizeToC[minScore] {
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seatMap[p] = true
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}
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/*
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for y := inp.TLY; y <= inp.BRY; y++ {
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for x := inp.TLX; x <= inp.BRX; x++ {
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c := h.Coordinate{X: x, Y: y}
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if _, ok := seatMap[c]; ok {
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fmt.Print("O")
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} else {
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fmt.Print(string(inp.Get(c)))
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}
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}
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fmt.Println()
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}
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*/
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return minScore, len(seatMap) + 1
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}
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var (
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@ -19,258 +96,29 @@ var (
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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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)
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var (
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scoreTrack map[h.Coordinate]int
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bestCostToEnd map[h.Coordinate]int
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)
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func part1(inpS []string) {
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inp := h.StringSliceToCoordByteMap(inpS)
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scoreTrack = make(map[h.Coordinate]int)
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bestCostToEnd = make(map[h.Coordinate]int)
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start, _ := inp.FindFirst('S')
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end, _ := inp.FindFirst('E')
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inp.Put(start, '.')
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bestCostToEnd[end] = 0
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cd := CD{c: start, d: E}
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solve(inp, cd, end, 0, []h.Coordinate{cd.c})
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best, ok := scoreTrack[end]
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if !ok {
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panic(errors.New("no path to end found"))
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}
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fmt.Println("Best Score:", best)
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bestSeats := make(map[h.Coordinate]byte)
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for i := range bestPaths {
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for j := range bestPaths[i] {
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bestSeats[bestPaths[i][j]] = byte('0' + i)
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}
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}
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printBestSeats(inp, bestSeats)
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fmt.Println("Seats:", len(bestSeats))
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}
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var bestPaths [][]h.Coordinate
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func solve(inp h.CoordByteMap, start CD, end h.Coordinate, score int, currPath []h.Coordinate) int {
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// tryMove takes the cd that we're moving to and the cost to move there
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// and returns the cost to get from that cd to the end
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tryMove := func(c CD, cost int) int {
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if inp.ContainsCoord(c.c) && inp.Get(c.c) != '#' {
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// printPathMap(inp, c, end, currPath)
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// poi := h.Coordinate{X: 3, Y: 10}
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// time.Sleep(time.Second / 20)
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nextScore := score + cost
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v, ok := bestCostToEnd[c.c]
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//if c.c.Equals(poi) {
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// fmt.Println("Current Scoretrack[poi] =", v)
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// fmt.Println("Next Score =", nextScore)
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// time.Sleep(time.Second * 5)
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//}
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if !ok || v >= nextScore {
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nxtPath := make([]h.Coordinate, len(currPath))
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copy(nxtPath, currPath)
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nxtPath = append(nxtPath, c.c)
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// Check end conditions
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if c.c.Equals(end) {
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if !ok || v > nextScore { // New Best
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fmt.Println("New Best Path")
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scoreTrack[end] = nextScore
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bestPaths = [][]h.Coordinate{nxtPath}
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} else if v == nextScore { // Another Best Path
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fmt.Println("Adding path to best paths")
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bestPaths = append(bestPaths, nxtPath)
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}
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return cost
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}
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// Not the end, but keep going
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scoreTrack[c.c] = nextScore
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solve(inp, c, end, nextScore, nxtPath)
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}
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}
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return h.MAX_INT
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}
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// Test forward
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cost := tryMove(start.move(), 1)
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// Test CW
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if wrk := tryMove(start.turnCW().move(), 1001); wrk < cost {
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cost = wrk
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}
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// Test CCW
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if wrk := tryMove(start.turnCCW().move(), 1001); wrk < cost {
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cost = wrk
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}
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bestCostToEnd[start.c] = cost
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return cost
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}
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func printPathMap(inp h.CoordByteMap, loc CD, end h.Coordinate, path []h.Coordinate) {
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fmt.Print(h.CLEAR_SCREEN)
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wrk := inp.Copy()
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wrk.ReplaceAll('.', ' ')
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for i := range path {
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wrk.Put(path[i], 'o')
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}
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wrk.Put(loc.c, loc.Byte())
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fmt.Println(wrk)
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if v, ok := scoreTrack[end]; ok {
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fmt.Printf("Best Score: %v (Paths: %d)\n", v, len(bestPaths))
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} else {
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fmt.Println("Waiting on best score...")
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}
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}
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func printBestSeats(inp h.CoordByteMap, seats map[h.Coordinate]byte) {
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fmt.Print(h.CLEAR_SCREEN)
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wrk := inp.Copy()
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wrk.ReplaceAll('.', ' ')
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for k, v := range seats {
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wrk.Put(k, byte(0+v))
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}
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fmt.Println(wrk)
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}
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/*
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func part2(inpS []string) {
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inp := h.StringSliceToCoordByteMap(inpS)
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scoreTrack = make(map[h.Coordinate]int)
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start, _ := inp.FindFirst('S')
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end, _ := inp.FindFirst('E')
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inp.Put(start, '.')
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cd := CD{c: start, d: E}
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lookForSeats(inp, cd, end, 0, []h.Coordinate{cd.c})
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_, ok := scoreTrack[end]
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if !ok {
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panic(errors.New("no path to end found"))
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}
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bestSeats := make(map[h.Coordinate]int)
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for i := range bestPaths {
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for j := range bestPaths[i] {
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bestSeats[bestPaths[i][j]] = i
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}
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}
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fmt.Println("Number of Seats:", len(bestSeats))
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}
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func coordInPath(c h.Coordinate, path []h.Coordinate) bool {
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for i := range path {
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if path[i].Equals(c) {
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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 lookForSeats(inp h.CoordByteMap, start CD, end h.Coordinate, score int, path []h.Coordinate) int {
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// Check for finished:
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if start.c.Equals(end) {
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v, ok := scoreTrack[end]
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if !ok || v > score {
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// We have a new best path
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bestPaths = [][]h.Coordinate{path}
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scoreTrack[end] = score
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} else if scoreTrack[end] == score {
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bestPaths = append(bestPaths, path)
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}
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return score
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}
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// Helper func
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canMoveTo := func(p h.Coordinate) bool {
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return inp.ContainsCoord(p) && inp.Get(p) != '#'
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}
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// Keep moving:
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tryMove := func(c CD, cost int) {
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if canMoveTo(c.c) {
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// Check if this path has alread gone through this spot
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nxtPath := make([]h.Coordinate, len(path))
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copy(nxtPath, path)
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if coordInPath(c.c, nxtPath) {
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return
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}
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// Ok, now what's the best score we end up if we make this move?
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nextScore := score + cost
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n, ok := scoreTrack[c.c]
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if !ok || n > nextScore {
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lookForSeats(inp, c, end, nextScore, append(nxtPath, c.c))
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}
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}
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}
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// Test forward
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tryMove(start.move(), 1)
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// Test CW
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tryMove(start.turnCW().move(), 1001)
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// Test CCW
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tryMove(start.turnCCW().move(), 1001)
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return scoreTrack[start.c]
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}
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*/
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type CD struct {
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c h.Coordinate
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d h.Coordinate
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c, d h.Coordinate
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}
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func (cd CD) move() CD {
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return CD{
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c: cd.c.Add(cd.d),
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d: cd.d,
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func (cd CD) GetNeighbors() []CD {
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var ret []CD
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opp := h.Coordinate{X: -cd.d.X, Y: -cd.d.Y}
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for _, dir := range Dirs {
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if !dir.Equals(opp) {
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ret = append(ret, CD{
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c: cd.c.Add(dir),
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d: dir,
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})
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}
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}
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return ret
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}
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func (cd CD) turnCW() CD {
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var newD h.Coordinate
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switch cd.d {
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case N:
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newD = E
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case E:
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newD = S
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case S:
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newD = W
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case W:
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newD = N
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}
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return CD{
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c: cd.c,
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d: newD,
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}
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}
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func (cd CD) turnCCW() CD {
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var newD h.Coordinate
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switch cd.d {
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case N:
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newD = W
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case E:
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newD = N
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case S:
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newD = E
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case W:
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newD = S
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}
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return CD{
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c: cd.c,
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d: newD,
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}
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}
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func (cd CD) Byte() byte {
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switch cd.d {
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case N:
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return '^'
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case E:
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return '>'
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case S:
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return 'v'
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case W:
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return '<'
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}
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return '?'
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type State struct {
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pos CD
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path []h.Coordinate
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score int
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}
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276
2024/day16/main.go.bk
Normal file
276
2024/day16/main.go.bk
Normal file
@ -0,0 +1,276 @@
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package main
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import (
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"errors"
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"fmt"
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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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part1(inp)
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// fmt.Println()
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// part2(inp)
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}
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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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)
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var (
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scoreTrack map[h.Coordinate]int
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bestCostToEnd map[h.Coordinate]int
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)
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func part1(inpS []string) {
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inp := h.StringSliceToCoordByteMap(inpS)
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scoreTrack = make(map[h.Coordinate]int)
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bestCostToEnd = make(map[h.Coordinate]int)
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start, _ := inp.FindFirst('S')
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end, _ := inp.FindFirst('E')
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inp.Put(start, '.')
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bestCostToEnd[end] = 0
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cd := CD{c: start, d: E}
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solve(inp, cd, end, 0, []h.Coordinate{cd.c})
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best, ok := scoreTrack[end]
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if !ok {
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panic(errors.New("no path to end found"))
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}
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fmt.Println("Best Score:", best)
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bestSeats := make(map[h.Coordinate]byte)
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for i := range bestPaths {
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for j := range bestPaths[i] {
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bestSeats[bestPaths[i][j]] = byte('0' + i)
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}
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}
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printBestSeats(inp, bestSeats)
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fmt.Println("Seats:", len(bestSeats))
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}
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var bestPaths [][]h.Coordinate
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func solve(inp h.CoordByteMap, start CD, end h.Coordinate, score int, currPath []h.Coordinate) int {
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// tryMove takes the cd that we're moving to and the cost to move there
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// and returns the cost to get from that cd to the end
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tryMove := func(c CD, cost int) int {
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if inp.ContainsCoord(c.c) && inp.Get(c.c) != '#' {
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// printPathMap(inp, c, end, currPath)
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// poi := h.Coordinate{X: 3, Y: 10}
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// time.Sleep(time.Second / 20)
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nextScore := score + cost
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v, ok := bestCostToEnd[c.c]
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//if c.c.Equals(poi) {
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// fmt.Println("Current Scoretrack[poi] =", v)
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// fmt.Println("Next Score =", nextScore)
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// time.Sleep(time.Second * 5)
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//}
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if !ok || v >= nextScore {
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nxtPath := make([]h.Coordinate, len(currPath))
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copy(nxtPath, currPath)
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nxtPath = append(nxtPath, c.c)
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// Check end conditions
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if c.c.Equals(end) {
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if !ok || v > nextScore { // New Best
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fmt.Println("New Best Path")
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scoreTrack[end] = nextScore
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bestPaths = [][]h.Coordinate{nxtPath}
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} else if v == nextScore { // Another Best Path
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fmt.Println("Adding path to best paths")
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bestPaths = append(bestPaths, nxtPath)
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}
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return cost
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}
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// Not the end, but keep going
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scoreTrack[c.c] = nextScore
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solve(inp, c, end, nextScore, nxtPath)
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}
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}
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return h.MAX_INT
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}
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// Test forward
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cost := tryMove(start.move(), 1)
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// Test CW
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if wrk := tryMove(start.turnCW().move(), 1001); wrk < cost {
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cost = wrk
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}
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// Test CCW
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if wrk := tryMove(start.turnCCW().move(), 1001); wrk < cost {
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cost = wrk
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}
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bestCostToEnd[start.c] = cost
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return cost
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}
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func printPathMap(inp h.CoordByteMap, loc CD, end h.Coordinate, path []h.Coordinate) {
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fmt.Print(h.CLEAR_SCREEN)
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wrk := inp.Copy()
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wrk.ReplaceAll('.', ' ')
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for i := range path {
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wrk.Put(path[i], 'o')
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}
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wrk.Put(loc.c, loc.Byte())
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fmt.Println(wrk)
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if v, ok := scoreTrack[end]; ok {
|
||||
fmt.Printf("Best Score: %v (Paths: %d)\n", v, len(bestPaths))
|
||||
} else {
|
||||
fmt.Println("Waiting on best score...")
|
||||
}
|
||||
}
|
||||
|
||||
func printBestSeats(inp h.CoordByteMap, seats map[h.Coordinate]byte) {
|
||||
fmt.Print(h.CLEAR_SCREEN)
|
||||
wrk := inp.Copy()
|
||||
wrk.ReplaceAll('.', ' ')
|
||||
for k, v := range seats {
|
||||
wrk.Put(k, byte(0+v))
|
||||
}
|
||||
fmt.Println(wrk)
|
||||
}
|
||||
|
||||
/*
|
||||
func part2(inpS []string) {
|
||||
inp := h.StringSliceToCoordByteMap(inpS)
|
||||
scoreTrack = make(map[h.Coordinate]int)
|
||||
start, _ := inp.FindFirst('S')
|
||||
end, _ := inp.FindFirst('E')
|
||||
inp.Put(start, '.')
|
||||
cd := CD{c: start, d: E}
|
||||
lookForSeats(inp, cd, end, 0, []h.Coordinate{cd.c})
|
||||
_, ok := scoreTrack[end]
|
||||
if !ok {
|
||||
panic(errors.New("no path to end found"))
|
||||
}
|
||||
bestSeats := make(map[h.Coordinate]int)
|
||||
for i := range bestPaths {
|
||||
for j := range bestPaths[i] {
|
||||
bestSeats[bestPaths[i][j]] = i
|
||||
}
|
||||
}
|
||||
fmt.Println("Number of Seats:", len(bestSeats))
|
||||
}
|
||||
|
||||
|
||||
|
||||
func coordInPath(c h.Coordinate, path []h.Coordinate) bool {
|
||||
for i := range path {
|
||||
if path[i].Equals(c) {
|
||||
return true
|
||||
}
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
||||
func lookForSeats(inp h.CoordByteMap, start CD, end h.Coordinate, score int, path []h.Coordinate) int {
|
||||
// Check for finished:
|
||||
if start.c.Equals(end) {
|
||||
v, ok := scoreTrack[end]
|
||||
if !ok || v > score {
|
||||
// We have a new best path
|
||||
bestPaths = [][]h.Coordinate{path}
|
||||
scoreTrack[end] = score
|
||||
} else if scoreTrack[end] == score {
|
||||
bestPaths = append(bestPaths, path)
|
||||
}
|
||||
return score
|
||||
}
|
||||
|
||||
// Helper func
|
||||
canMoveTo := func(p h.Coordinate) bool {
|
||||
return inp.ContainsCoord(p) && inp.Get(p) != '#'
|
||||
}
|
||||
// Keep moving:
|
||||
tryMove := func(c CD, cost int) {
|
||||
if canMoveTo(c.c) {
|
||||
// Check if this path has alread gone through this spot
|
||||
nxtPath := make([]h.Coordinate, len(path))
|
||||
copy(nxtPath, path)
|
||||
if coordInPath(c.c, nxtPath) {
|
||||
return
|
||||
}
|
||||
// Ok, now what's the best score we end up if we make this move?
|
||||
nextScore := score + cost
|
||||
n, ok := scoreTrack[c.c]
|
||||
if !ok || n > nextScore {
|
||||
lookForSeats(inp, c, end, nextScore, append(nxtPath, c.c))
|
||||
}
|
||||
}
|
||||
}
|
||||
// Test forward
|
||||
tryMove(start.move(), 1)
|
||||
// Test CW
|
||||
tryMove(start.turnCW().move(), 1001)
|
||||
// Test CCW
|
||||
tryMove(start.turnCCW().move(), 1001)
|
||||
return scoreTrack[start.c]
|
||||
}
|
||||
*/
|
||||
|
||||
type CD struct {
|
||||
c h.Coordinate
|
||||
d h.Coordinate
|
||||
}
|
||||
|
||||
func (cd CD) move() CD {
|
||||
return CD{
|
||||
c: cd.c.Add(cd.d),
|
||||
d: cd.d,
|
||||
}
|
||||
}
|
||||
|
||||
func (cd CD) turnCW() CD {
|
||||
var newD h.Coordinate
|
||||
switch cd.d {
|
||||
case N:
|
||||
newD = E
|
||||
case E:
|
||||
newD = S
|
||||
case S:
|
||||
newD = W
|
||||
case W:
|
||||
newD = N
|
||||
}
|
||||
return CD{
|
||||
c: cd.c,
|
||||
d: newD,
|
||||
}
|
||||
}
|
||||
|
||||
func (cd CD) turnCCW() CD {
|
||||
var newD h.Coordinate
|
||||
switch cd.d {
|
||||
case N:
|
||||
newD = W
|
||||
case E:
|
||||
newD = N
|
||||
case S:
|
||||
newD = E
|
||||
case W:
|
||||
newD = S
|
||||
}
|
||||
return CD{
|
||||
c: cd.c,
|
||||
d: newD,
|
||||
}
|
||||
}
|
||||
|
||||
func (cd CD) Byte() byte {
|
||||
switch cd.d {
|
||||
case N:
|
||||
return '^'
|
||||
case E:
|
||||
return '>'
|
||||
case S:
|
||||
return 'v'
|
||||
case W:
|
||||
return '<'
|
||||
}
|
||||
return '?'
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user