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@ -13,6 +13,7 @@ import (
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)
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var shortestSolutionDist int
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var pois []string
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func main() {
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playMode := aoc.ArgIsSet("-play")
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@ -58,8 +59,8 @@ func main() {
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} else {
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shortestSolutionDist = -1
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m.PrintMaze()
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m.StartSolve(0)
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fmt.Println("Shortest Solution: ", shortestSolutionDist)
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m.StartSolve()
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//fmt.Println("Shortest Solution: ", shortestSolutionDist)
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}
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}
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@ -259,7 +260,7 @@ func (p *Path) Append(c Coord) {
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p.coords = append(p.coords, c)
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}
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func (p *Path) ContainsCoord(x, y int) bool {
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func (p *Path) Contains(x, y int) bool {
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for i := range p.coords {
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if p.coords[i].is(x, y) {
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return true
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@ -293,13 +294,23 @@ func CreateMaze(inp []string) *Maze {
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for y := range inp {
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for x := range inp[y] {
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if inp[y][x] == '#' {
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m.walls.Add(x, y, aoc.FillChar)
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m.walls.Add(x, y, "#") //aoc.FillChar)
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} else if inp[y][x] != '.' {
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if inp[y][x] == '0' {
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m.start = &Coord{x: x, y: y, label: "0"}
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} else {
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m.pois.Add(x, y, string(inp[y][x]))
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}
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newOne := true
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for pi := range pois {
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if pois[pi] == string(inp[y][x]) {
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newOne = false
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break
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}
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}
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if newOne {
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pois = append(pois, string(inp[y][x]))
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}
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}
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if x > m.w {
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m.w = x
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@ -346,167 +357,148 @@ func (m *Maze) PrintMaze() {
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}
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}
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// StartSolve kicks off the solve and returns the lowest number of steps, or an error
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func (m *Maze) StartSolve(dist int) (int, error) {
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numWorkers++
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solved, d := m.Solve(m.start.x, m.start.y, 0)
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dist += d
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numWorkers--
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if !solved {
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return dist, errors.New("Couldn't solve maze. :(")
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}
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fmt.Println("Ended Solve (current workers:", numWorkers, "; current shortest:", shortestSolutionDist, ")")
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if dist < shortestSolutionDist || shortestSolutionDist == -1 {
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shortestSolutionDist = dist
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}
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return dist, nil
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}
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// We want to build a set of all solutions from one poi to all others
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// then find the shortest path that hits them all
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func (m *Maze) Solve(x, y, dist int) (bool, int) {
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wrkCoord := Coord{x: x, y: y, dist: dist}
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if m.end == nil || m.end.is(x, y) {
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// We found a point of interest! (or we're just starting)
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// No end set. For each poi, we want to fork a new maze being solved
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// with the end set to that poi, and that poi removed from the poi list
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if len(m.pois.coords) == 0 {
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// Unless there aren't any left, then we solved it
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return true, dist
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}
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for i := range m.pois.coords {
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endPoi := m.pois.coords[i]
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// Copy the pois
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newPois := make([]Coord, len(m.pois.coords))
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copy(newPois, m.pois.coords)
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// Then delete the endPoi from it
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newPois = append(newPois[:i], newPois[i+1:]...)
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// Create a new maze with start set to this point and end set to the first poi
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newM := CopyMaze(m.walls, CreateCCFromCoordSlice(newPois))
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newM.start = &wrkCoord
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newM.end = &endPoi
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newM.StartSolve(dist + 1)
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}
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}
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if m.testedPath.ContainsCoord(x, y) {
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return false, 0
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}
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// Figure out if there is a shorter path to this coordinate
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if !m.walls.Contains(x-1, y) {
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if t := m.testedPath.GetCoordAt(x-1, y); t != nil {
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if t.dist+1 < wrkCoord.dist {
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return false, 0
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}
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}
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}
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if !m.walls.Contains(x+1, y) {
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if t := m.testedPath.GetCoordAt(x+1, y); t != nil {
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if t.dist+1 < wrkCoord.dist {
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return false, 0
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}
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}
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}
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if !m.walls.Contains(x, y-1) {
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if t := m.testedPath.GetCoordAt(x, y-1); t != nil {
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if t.dist+1 < wrkCoord.dist {
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return false, 0
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}
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}
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}
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if !m.walls.Contains(x, y+1) {
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if t := m.testedPath.GetCoordAt(x, y+1); t != nil {
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if t.dist+1 < wrkCoord.dist {
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return false, 0
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}
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}
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}
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m.testedPath.Append(wrkCoord)
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shortest := -1
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var foundSol bool
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if m.testedPath.GetCoordAt(x-1, y) == nil && !m.walls.Contains(x-1, y) {
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if sol, nDist := m.Solve(x-1, y, wrkCoord.dist+1); sol {
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foundSol = true
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if nDist < shortest || shortest == -1 {
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shortest = nDist
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}
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}
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}
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if m.testedPath.GetCoordAt(x, y-1) == nil && !m.walls.Contains(x, y-1) {
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if sol, nDist := m.Solve(x, y-1, wrkCoord.dist+1); sol {
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foundSol = true
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if nDist < shortest || shortest == -1 {
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shortest = nDist
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}
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}
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}
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if m.testedPath.GetCoordAt(x+1, y) == nil && !m.walls.Contains(x+1, y) {
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if sol, nDist := m.Solve(x+1, y, wrkCoord.dist+1); sol {
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foundSol = true
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if nDist < shortest || shortest == -1 {
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shortest = nDist
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}
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}
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}
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if m.testedPath.GetCoordAt(x, y+1) == nil && !m.walls.Contains(x, y+1) {
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if sol, nDist := m.Solve(x, y+1, wrkCoord.dist+1); sol {
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foundSol = true
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if nDist < shortest || shortest == -1 {
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shortest = nDist
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}
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}
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}
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return foundSol, dist + shortest
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}
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var shortestPoiDist map[string]int
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// Pt2StartSolve finds the shortest distance between every poi and every other poi
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func (m *Maze) Pt2StartSolve() {
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// StartSolve finds the shortest distance between every poi and every other poi
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// Then figures out the shortest one to hit them all
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func (m *Maze) StartSolve() {
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shortestPoiDist = make(map[string]int)
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for _, i := range m.pois.coords {
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if gud, dist := m.GetShortestPath(m.start, i, 0); gud {
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if dist, gud := m.GetShortestPath(m.start.x, m.start.y, i.x, i.y, 0, *new(Path)); gud {
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shortestPoiDist[m.start.label+";"+i.label] = dist
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}
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for _, j := range m.pois.coords {
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if i.label != j.label {
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fst, scd := i, j
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if i[0] > j[0] {
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if i.label[0] > j.label[0] {
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fst, scd = j, i
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}
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if _, ok := shortestPoiDist[fst+";"+scd]; !ok {
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if gud, dist := m.GetShortestPath(i, j, 0); gud {
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shortestPoiDist[fst+";"+scd] = dist
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if _, ok := shortestPoiDist[fst.label+";"+scd.label]; !ok {
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if dist, gud := m.GetShortestPath(i.x, i.y, j.x, j.y, 0, *new(Path)); gud {
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shortestPoiDist[fst.label+";"+scd.label] = dist
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}
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}
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}
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}
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}
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// TODO: Find shortest path that hits them all
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var poiString string
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fmt.Println("pois", pois)
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for i := range pois {
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poiString += pois[i]
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}
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poiPerms := aoc.StringPermutations(poiString)
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var wrk []string
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for i := range poiPerms {
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var found bool
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for j := range wrk {
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if wrk[j] == poiPerms[i] {
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found = true
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}
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}
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if !found {
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wrk = append(wrk, poiPerms[i])
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}
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}
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poiPerms = wrk
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shortest := -1
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var shortestPerm string
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for _, perm := range poiPerms {
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if perm[0] != '0' {
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continue
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}
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var permTtl int
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for i := range perm {
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if i > 0 {
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beg, end := string(perm[i-1]), string(perm[i])
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if beg[0] > end[0] {
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beg, end = end, beg
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}
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permTtl += shortestPoiDist[beg+";"+end]
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}
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}
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if permTtl < shortest || shortest == -1 {
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shortestPerm = perm
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shortest = permTtl
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}
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}
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fmt.Println(shortestPerm, ": ", shortest)
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}
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// GetShortestPath just finds the shortest path between two points
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func (m *Maze) GetShortestPath(beg *Coord, end *Coord, dist int) (int, bool) {
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// TODO: actually solve for shortest path
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return 0, false
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}
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/* Put on hold
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// We're going to find the closest POI (straight-line) and solve to it
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func (m *Maze) Solve(x, y, dist int) bool {
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wrkCoord := Coord{x: x, y: y, dist: dist}
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_ = wrkCoord
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if m.end == nil || m.end.is(x, y) {
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// We made it (or haven't started)! Do we have any more pois?
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if len(m.pois.coords) == 0 {
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// Nope, none left, we're done
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return true
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}
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m.end = m.FindClosestPoi()
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func (m *Maze) GetShortestPath(begX, begY, endX, endY, dist int, path Path) (int, bool) {
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if begX == endX && begY == endY {
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return dist, true
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}
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return false
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if path.Contains(begX, begY) {
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return 0, false
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}
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// Figure out if there is a shorter path to this coordinate
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if !m.walls.Contains(begX-1, begY) {
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if t := path.GetCoordAt(begX-1, begY); t != nil {
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if t.dist+1 < dist {
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return 0, false
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}
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}
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}
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if !m.walls.Contains(begX+1, begY) {
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if t := path.GetCoordAt(begX+1, begY); t != nil {
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if t.dist+1 < dist {
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return 0, false
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}
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}
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}
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if !m.walls.Contains(begX, begY-1) {
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if t := path.GetCoordAt(begX, begY-1); t != nil {
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if t.dist+1 < dist {
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return 0, false
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}
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}
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}
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if !m.walls.Contains(begX, begY+1) {
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if t := path.GetCoordAt(begX, begY+1); t != nil {
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if t.dist+1 < dist {
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return 0, false
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}
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}
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}
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path.Append(Coord{x: begX, y: begY, dist: dist})
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shortest := -1
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var foundSol bool
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if path.GetCoordAt(begX-1, begY) == nil && !m.walls.Contains(begX-1, begY) {
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if nDist, sol := m.GetShortestPath(begX-1, begY, endX, endY, dist+1, path); sol {
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foundSol = true
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if nDist < shortest || shortest == -1 {
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shortest = nDist
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}
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}
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}
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if path.GetCoordAt(begX, begY-1) == nil && !m.walls.Contains(begX, begY-1) {
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if nDist, sol := m.GetShortestPath(begX, begY-1, endX, endY, dist+1, path); sol {
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foundSol = true
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if nDist < shortest || shortest == -1 {
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shortest = nDist
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}
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}
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}
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if path.GetCoordAt(begX+1, begY) == nil && !m.walls.Contains(begX+1, begY) {
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if nDist, sol := m.GetShortestPath(begX+1, begY, endX, endY, dist+1, path); sol {
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foundSol = true
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if nDist < shortest || shortest == -1 {
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shortest = nDist
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}
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}
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}
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if path.GetCoordAt(begX, begY+1) == nil && !m.walls.Contains(begX, begY+1) {
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if nDist, sol := m.GetShortestPath(begX, begY+1, endX, endY, dist+1, path); sol {
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foundSol = true
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if nDist < shortest || shortest == -1 {
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shortest = nDist
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}
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}
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}
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return shortest, foundSol
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}
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*/
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func (m *Maze) FindClosestPoi() *Coord {
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var shortestPoi Coord
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