Day 20 part 1
This was pretty much just day 18 again, but without doors and with an input data parsing skill check. I simplified day 18 and went with a basic Dijkstra algorithm after the DFS to crawl the maze which solved this just fine. Part 2 is...ugh.
This commit is contained in:
341
days/20.go
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341
days/20.go
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@ -0,0 +1,341 @@
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package days
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import (
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"container/heap"
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"fmt"
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"math"
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"strings"
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u "parnic.com/aoc2019/utilities"
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)
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type day20Cell int8
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type day20Graph map[string][]u.Pair[string, int]
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const (
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day20CellWall day20Cell = iota
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day20CellPath
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day20CellDonutHole
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)
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var (
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day20AdjacentOffsets = []u.Vec2i{
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{X: -1, Y: 0},
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{X: 1, Y: 0},
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{X: 0, Y: -1},
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{X: 0, Y: 1},
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}
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)
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type Day20 struct {
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grid [][]day20Cell
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entrance u.Vec2i
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exit u.Vec2i
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portals map[string]u.Pair[u.Vec2i, u.Vec2i]
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portalNames []string
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}
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func (d *Day20) Parse() {
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d.portals = make(map[string]u.Pair[u.Vec2i, u.Vec2i])
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d.portalNames = make([]string, 0)
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lines := u.GetStringLines("20s1")
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d.grid = make([][]day20Cell, len(lines)-4)
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currPortal := strings.Builder{}
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for row, line := range lines {
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y := row - 2
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isGridRow := row >= 2 && row < len(lines)-2
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if isGridRow {
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d.grid[y] = make([]day20Cell, len(line)-4)
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}
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for col, ch := range lines[row] {
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x := col - 2
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isGridCol := col >= 2 && col < len(line)-2
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if isGridRow && isGridCol {
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if ch == '#' {
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d.grid[y][x] = day20CellWall
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} else if ch == '.' {
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d.grid[y][x] = day20CellPath
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} else {
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d.grid[y][x] = day20CellDonutHole
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}
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}
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if ch >= 'A' && ch <= 'Z' {
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portalX := 0
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portalY := 0
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if len(line) > col+1 && line[col+1] >= 'A' && line[col+1] <= 'Z' {
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currPortal.WriteRune(ch)
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currPortal.WriteRune(rune(line[col+1]))
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if len(line) > col+2 && line[col+2] == '.' {
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portalY = y
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portalX = x + 2
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} else if col-1 >= 0 && line[col-1] == '.' {
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portalY = y
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portalX = x - 1
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} else {
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panic("!")
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}
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} else if len(lines) > row+1 && lines[row+1][col] >= 'A' && lines[row+1][col] <= 'Z' {
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currPortal.WriteRune(ch)
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currPortal.WriteRune(rune(lines[row+1][col]))
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if len(lines) > row+2 && lines[row+2][col] == '.' {
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portalY = y + 2
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portalX = x
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} else if row-1 >= 0 && lines[row-1][col] == '.' {
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portalY = y - 1
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portalX = x
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} else {
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panic("!")
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}
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}
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if currPortal.Len() == 2 {
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portal := currPortal.String()
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portalVec := u.Vec2i{X: portalX, Y: portalY}
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if portal == "AA" {
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d.entrance = portalVec
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} else if portal == "ZZ" {
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d.exit = portalVec
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} else {
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pair, exists := d.portals[portal]
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if exists {
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d.portals[portal] = u.Pair[u.Vec2i, u.Vec2i]{First: pair.First, Second: portalVec}
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} else {
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d.portals[portal] = u.Pair[u.Vec2i, u.Vec2i]{First: portalVec, Second: portalVec}
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}
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u.AddToArray(&d.portalNames, portal)
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}
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// fmt.Println("full portal:", currPortal.String(), "at", portalX, ",", portalY)
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currPortal.Reset()
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}
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}
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}
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}
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}
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func (d Day20) Num() int {
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return 20
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}
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func (d Day20) isPortal(vec u.Vec2i) (bool, int) {
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if d.grid[vec.Y][vec.X] != day20CellPath {
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return false, 0
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}
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for i, name := range d.portalNames {
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v := d.portals[name]
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if v.First == vec || v.Second == vec {
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return true, i
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}
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}
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return false, 0
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}
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func (d Day20) Draw() {
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for y := range d.grid {
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for x := range d.grid[y] {
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switch d.grid[y][x] {
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case day20CellWall:
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fmt.Print("█")
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case day20CellDonutHole:
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fmt.Print(" ")
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case day20CellPath:
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posVec := u.Vec2i{X: x, Y: y}
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if posVec == d.entrance {
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fmt.Print("@")
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} else if posVec == d.exit {
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fmt.Print("!")
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} else {
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isPortal, portalIdx := d.isPortal(posVec)
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if isPortal {
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ch := 'a' + portalIdx
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if ch > 'z' {
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ch = 'A' + (portalIdx - 26)
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}
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fmt.Printf("%c", ch)
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} else {
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fmt.Print(" ")
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}
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}
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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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func (d Day20) findAdjacentCells(inPos u.Vec2i, grid [][]day20Cell) []u.Pair[string, int] {
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found := make([]u.Pair[string, int], 0)
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getAdjacent := func(pos u.Vec2i) []u.Vec2i {
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retAdjacent := make([]u.Vec2i, 0, len(day20AdjacentOffsets))
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for _, off := range day20AdjacentOffsets {
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offVec := u.Vec2i{X: pos.X + off.X, Y: pos.Y + off.Y}
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if offVec.Y < 0 || offVec.Y >= len(grid) || offVec.X < 0 || offVec.X >= len(grid[0]) {
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continue
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}
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if grid[offVec.Y][offVec.X] != day20CellPath {
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continue
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}
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retAdjacent = append(retAdjacent, offVec)
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}
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return retAdjacent
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}
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queue := make([]u.Pair[int, u.Vec2i], 0)
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visited := map[u.Vec2i]bool{
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inPos: true,
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}
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for _, adjacent := range getAdjacent(inPos) {
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queue = append(queue, u.Pair[int, u.Vec2i]{First: 1, Second: adjacent})
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}
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for len(queue) > 0 {
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next := queue[0]
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queue = queue[1:]
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if _, exists := visited[next.Second]; !exists {
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visited[next.Second] = true
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adjacentIsPortal, portalIdx := d.isPortal(next.Second)
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if adjacentIsPortal || next.Second == d.entrance || next.Second == d.exit {
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var portalName string
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if next.Second == d.entrance {
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portalName = "AA"
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} else if next.Second == d.exit {
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portalName = "ZZ"
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} else {
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portalName = d.portalNames[portalIdx]
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}
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alreadyFound := false
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for _, p := range found {
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if p.First == portalName {
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alreadyFound = true
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break
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}
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}
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if !alreadyFound {
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found = append(found, u.Pair[string, int]{First: portalName, Second: next.First})
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continue
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}
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}
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for _, neighbor := range getAdjacent(next.Second) {
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if _, exists := visited[neighbor]; !exists {
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queue = append(queue, u.Pair[int, u.Vec2i]{First: next.First + 1, Second: neighbor})
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}
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}
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}
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}
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return found
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}
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type day20PriorityQueue struct {
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distance int
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neighbor string
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}
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type day20PriorityQueueHeap []day20PriorityQueue
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func (h day20PriorityQueueHeap) Len() int { return len(h) }
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func (h day20PriorityQueueHeap) Less(i, j int) bool { return h[i].distance < h[j].distance }
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func (h day20PriorityQueueHeap) Swap(i, j int) { h[i], h[j] = h[j], h[i] }
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func (h *day20PriorityQueueHeap) Push(x any) {
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*h = append(*h, x.(day20PriorityQueue))
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}
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func (h *day20PriorityQueueHeap) Pop() any {
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old := *h
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n := len(old)
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x := old[n-1]
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*h = old[0 : n-1]
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return x
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}
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func (d Day20) dijkstra(graph day20Graph, start, end string) int {
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distance := make(map[string]int)
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ih := day20PriorityQueueHeap{
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day20PriorityQueue{
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distance: 0,
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neighbor: start,
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},
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}
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heap.Init(&ih)
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visited := make(map[string]bool)
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for ih.Len() > 0 {
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node := heap.Pop(&ih).(day20PriorityQueue)
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if node.neighbor == end {
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return node.distance - 1
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}
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if _, exists := visited[node.neighbor]; exists {
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continue
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}
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visited[node.neighbor] = true
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for _, p := range graph[node.neighbor] {
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if _, exists := visited[p.First]; exists {
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continue
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}
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newDistance := node.distance + p.Second
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if dist, exists := distance[p.First]; !exists || newDistance < dist {
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distance[p.First] = newDistance
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heap.Push(&ih, day20PriorityQueue{
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distance: newDistance + 1,
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neighbor: p.First,
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})
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}
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}
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}
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return math.MaxInt
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}
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func (d Day20) buildGraph() day20Graph {
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graph := make(day20Graph)
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adjacent := d.findAdjacentCells(d.entrance, d.grid)
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graph["AA"] = adjacent
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for _, portalName := range d.portalNames {
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portal := d.portals[portalName]
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adjacent = d.findAdjacentCells(portal.First, d.grid)
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graph[portalName] = adjacent
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adjacent = d.findAdjacentCells(portal.Second, d.grid)
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graph[portalName] = append(graph[portalName], adjacent...)
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}
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return graph
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}
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func (d *Day20) Part1() string {
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// d.Draw()
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graph := d.buildGraph()
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distance := d.dijkstra(graph, "AA", "ZZ")
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return fmt.Sprintf("%d %s%d%s", distance, u.TextBold, len(graph), u.TextReset)
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}
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func (d *Day20) Part2() string {
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return fmt.Sprintf("%s%d%s", u.TextBold, 0, u.TextReset)
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}
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125
inputs/20p.txt
Normal file
125
inputs/20p.txt
Normal file
@ -0,0 +1,125 @@
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J L P P V T X
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G V M I O R C
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#######################################.#######.###.###########.###.#.#######.#########################################
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#...#.........#.#...#.#...#.........#.....#.#.....#.......#...#...#.....#.#...........#...........#.......#...#.......#
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###.#########.#.#.###.#.#######.###.###.###.#####.#.###.###.#####.###.###.#####.#.#######.#####.###.#.#####.#####.#####
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#.#.....#...........#...#...#.#.#.....#.....#.#...#.#.....#.#.#.....#.....#.....#.#.#.#.......#.#...#.....#.#.#.....#.#
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#.#####.#####.###.#####.###.#.#######.#.#.###.#.#####.###.#.#.#.#########.#.#.#####.#.###.#######.#.#######.#.###.###.#
|
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#...#...#.....#...#.#...#.#.#...#.#.....#.#.......#...#.#.#...#.#.#.......#.#.#...............#.#.#.........#.#.#.....#
|
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###.#.#.#########.#.###.#.#.#.###.#.#.#########.#####.#.#.#.#.#.#.###.#####.###.#.#.#.###.#.###.###.#######.#.#.#.#####
|
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#.....#...#.....#.........#...#.#...#.........#.....#.#...#.#.....#.....#.#.#...#.#.#.#...#...........#...#.........#.#
|
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#########.#####.#.#.#.#.#.###.#.#######.#####.###.#####.###.###.###.#####.#.#.###.#.#.###.#.#####.#.###.#########.###.#
|
||||
#.#.........#.....#.#.#.#.#.......#.......#.#.#.......#.#...#.#...#...#...#.....#.#.#...#.#.....#.#.............#.#...#
|
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#.###.###.#####.#########.###.#####.###.#.#.#####.#####.###.#.###.#.###.###.#.###.#######.###.#.#.#.#######.#####.###.#
|
||||
#...#...#.....#.#.#...#.........#...#...#.#.....#.#.#.....#...#...#.......#.#.#.........#...#.#.#.#.......#.#...#.#.#.#
|
||||
#.#########.###.#.#.#####.#.###.###.#######.###.#.#.#.###.###.###.#.#.#.###.#####.#.###.#.#.###.#.#.#.#######.#.###.#.#
|
||||
#...#.......#.#.#.....#.#.#.#...........#.....#.....#.#...#.....#.#.#.#.#.......#.#.#...#.#.#.#.#.#.#...#...#.#.#.#...#
|
||||
#.#########.#.###.###.#.###########.#########.###########.#.###.###.###.#########.#########.#.#####.#.###.###.###.###.#
|
||||
#...#.#.#.......#.#.....#.....#.....#.#.......#.#...#.#...#...#.#.#.#.#.#...#...........#.#.....#...#.....#...#.......#
|
||||
###.#.#.#####.#####.###.#####.#####.#.#####.###.###.#.###.#.#####.#.#.###.#######.#######.#.#######.#.###.###.#####.###
|
||||
#.....#.#.#.#.....#.#.#.........#.#.....#.#...........#...#.....#.........#...#...#...#...#.#.#...#.#.#.#...#.#.#.....#
|
||||
#.#.#.#.#.#.#.#######.#########.#.###.###.###.#####.#####.#.#######.#########.###.###.###.###.#.#####.#.#####.#.#.#.###
|
||||
#.#.#.......#.....#.#.#.#.#.#.#.#.....#...#...#.#.#.#...#.#.#.#.#.....#...#...#...#...#.....#.....#.#.#.#...#...#.#.#.#
|
||||
#####.#####.#.#####.#.#.#.#.#.#.###.#####.#.###.#.###.###.#.#.#.#.#.###.###.#.#.#####.#.#.#######.#.###.#.#####.###.#.#
|
||||
#.#.#.#.....#.....#.......................#...#...#.......#.....#.#.#.......#.#.........#...#.#.#.#...#.....#.#.#.....#
|
||||
#.#.#######.#.#######.###.#.#####.#######.#.#####.#.#.###.###.#####.#######.#.###.#######.#.#.#.#.#.#####.###.#.###.###
|
||||
#...#...........#.#.#.#...#.#...#.#...#.#.#.....#...#...#.#...#...........#.#...#.....#.#.#...........#...#...#.#...#.#
|
||||
###.#.#.###.#.###.#.#.#.#####.#####.###.#.#.#######.#.#.#.#.###########.###.###.#.#.#.#.#.#.#.#.###.#.###.###.#.#.#.#.#
|
||||
#.....#.#.#.#.#.....#.#...#...#.#.#.....#.#.....#...#.#.#.#...#.#.#...#.#...#.#.#.#.#.#.#.#.#.#.#.#.#...#.......#.#...#
|
||||
###.#.#.#.#.#####.###########.#.#.#.###.#.#.#####.#.#######.###.#.#.#.#.#.#.#.#.#.#####.#.#######.#######.#.###.#.#####
|
||||
#.#.#.#.#...#.#.......#.......#.....#.#.#.#...#.#.#.......#.......#.#...#.#.#.#...#.#...#.#...#...#...#...#.#...#.....#
|
||||
#.#########.#.###.#.#####.#.#.#####.#.#.#.###.#.###.###.#########.#.#######.#.#####.###.###.###.#####.#########.###.###
|
||||
#.....#.#.#.#.....#...#...#.#.#.......#...#.....#.....#...#.......#.....#.................#...#...#.........#.#.#.#...#
|
||||
#.#####.#.#.#######.#######.#########.#########.#########.#.#########.#.#######.#########.#.###.#####.#######.#.#.#.###
|
||||
#.....#.#.#.#...#.#.#.#.#.#...# F O O X N U W #.#.....#.#.#...#.#.#.........#
|
||||
#.#####.#.#.#.###.#.#.#.#.#.### Z G D L B Y W ###.#####.#.###.#.#.###.###.###
|
||||
#...#.#.#.#.#.#...#.......#...# #.......#.....#...#...#.#.#...#
|
||||
#.###.#.#.#.#.###.#.#.###.#.#.# #.#.#######.###.#.###.#.#.#.###
|
||||
PL....#.#.#...#...#...#...#...#.# #.#.#.#.#...#.#.#.....#.#.#.#.#
|
||||
#.###.#.###.#.###.#.#.#.###.#.# #.###.#.#.###.###.#######.#.#.#
|
||||
#.......#.#.......#.#.#.#...#..EL PM..#.........#.#.....#.#.......#
|
||||
#.#.#.###.###.#.#.###########.# #.###.###.###.#.#.#.#.###.###.#
|
||||
#.#.#.........#.#.#.....#...#.# #.#.#...#.......#.#.......#....BR
|
||||
#############.#.#####.###.##### #.#.###.#########.#.#.###.###.#
|
||||
YP..#.........#.#...#.#.#.#.....# #.#...#.....#.#.#.#.#...#...#.#
|
||||
#.#.###.#.#####.###.#.#.###.#.# #.#.#.###.###.#.###########.#.#
|
||||
#...#.#.#.#.#.#.#...#.....#.#.# #...#.....#.#.#.#...#.#...#.#.#
|
||||
#.###.###.#.#.###.#.#.#.###.### ###########.#.#.#.###.###.###.#
|
||||
#...#.#...........#...#........TH #.......#...............#...#.#
|
||||
###.#.#####################.### #.#####.#.###.###.#####.#.#.###
|
||||
EV..#.#...#.................#...# LV..#.#.....#...#...#.#.#...#.#..UN
|
||||
#.###.#.#####.#.###.#.#.###.### #.#.#.###.###.#.#.#.#.#####.#.#
|
||||
#.#...#...#...#.#...#.#.#.#...# #.#...#.#.#.#.#.#.#.#.......#.#
|
||||
#.#.#####.#.#.#.###.###.#.##### #######.###.#######.#.#######.#
|
||||
#.#.#.....#.#.#...#.#.#.......# #.#.......#.....#.#.#.........#
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#.#.#.#######.#######.###.#.#.# #.#####.#.###.###.#.###########
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#.#######.###########.###.###.# ###.###########.###.#.#.#.###.#
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#...........#.#.#.#.....#.#.#.# #...#...#.......#..............OA
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#.#.#.#.#.#.#.#.#.###.#####.### #####.#.#.#.###.#.#.###.###.#.#
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#.#.#.#.#.#.....#.............# #.#...#...#.#.....#.#...#...#.#
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#################.#########.### #.#.###.#.#########.###########
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#.....#.#.#.#.......#.....#...# #.#...#.#.#.......#.#.#.....#.#
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#.#.###.#.#.#######.#.###.###.# #.#.###.#.#.#########.#.#####.#
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#.#.#...#...#.#...#.....#.#.#.# SL....#.#.#.#.#.#.....#...#.#...#
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#.#.#.#.#.###.#.#.#######.#.#.# #####.#####.#.#.#.#####.#.#.###
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EL..#...#.........#.........#.#..WV #...............#.#.#..........XP
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#.###########.###.#########.### #.#########.###.###.###.#####.#
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###.#####.###.#########.#.###.# #.#.###.#.#.#####.#.#####.#.#.#
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UY..#...#.....#.#.........#.#....XP PL..#...#...#.#.#.#.#...#...#.#.#
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#.#.###.#.###########.#.#.##### #.###.#######.#.###.#.#.#####.#
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#.#.#...#.#.#.#.#.#...#.#.....# #...#...............#.....#.#.#
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#.#.#.#####.#.#.#.###.###.##### #.#.###############.#.#.###.#.#
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#...#...................#.....# #.#.#...........#...#.#.#...#.#
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#.#####.###.#.#######.#####.### #.#.###.#.#.#########.###.#.#.#
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#.#.#######.#.#####.#.#####.### #.###.#########.###.#.#####.#.#
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#.#.###.#.#.###.#.#.#######.#.# V J Y T C B O #.#####.###.#.###.#.###.###.#.#
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#.#.#...#.#...#.....#.#.......# O H P R K R A #.#.....#...#...#.#.#.#.....#.#
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#.#.#.#.###.#.#.#.#.#.#.###.#.#####.#####.###########.#######.#####.#####.#######.###############.#.#.#.###.#.#.#.#.###
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||||
#####################################.#####.#######.#######.###.#########.#####.#######################################
|
||||
O C N X F S W
|
||||
G K B L Z L W
|
||||
19
inputs/20s1.txt
Normal file
19
inputs/20s1.txt
Normal file
@ -0,0 +1,19 @@
|
||||
A
|
||||
A
|
||||
#######.#########
|
||||
#######.........#
|
||||
#######.#######.#
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||||
##### B ###.#
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||||
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||||
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|
||||
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||||
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|
||||
FG..#########.....#
|
||||
###########.#####
|
||||
Z
|
||||
Z
|
||||
37
inputs/20s2.txt
Normal file
37
inputs/20s2.txt
Normal file
@ -0,0 +1,37 @@
|
||||
A
|
||||
A
|
||||
#################.#############
|
||||
#.#...#...................#.#.#
|
||||
#.#.#.###.###.###.#########.#.#
|
||||
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||||
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|
||||
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||||
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|
||||
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|
||||
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||||
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||||
#...#.# YN....#.#
|
||||
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|
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DI....#.# #.....#
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||||
#####.# #.###.#
|
||||
ZZ......# QG....#..AS
|
||||
###.### #######
|
||||
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|
||||
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|
||||
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|
||||
#####.# #.#####
|
||||
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|
||||
#.###.# #.###.#
|
||||
#.#...# #.....#
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||||
###.### J L J #.#.###
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||||
#.....# O F P #.#...#
|
||||
#.###.#####.#.#####.#####.###.#
|
||||
#...#.#.#...#.....#.....#.#...#
|
||||
#.#####.###.###.#.#.#########.#
|
||||
#...#.#.....#...#.#.#.#.....#.#
|
||||
#.###.#####.###.###.#.#.#######
|
||||
#.#.........#...#.............#
|
||||
#########.###.###.#############
|
||||
B J C
|
||||
U P P
|
||||
37
inputs/20s3.txt
Normal file
37
inputs/20s3.txt
Normal file
@ -0,0 +1,37 @@
|
||||
Z L X W C
|
||||
Z P Q B K
|
||||
###########.#.#.#.#######.###############
|
||||
#...#.......#.#.......#.#.......#.#.#...#
|
||||
###.#.#.#.#.#.#.#.###.#.#.#######.#.#.###
|
||||
#.#...#.#.#...#.#.#...#...#...#.#.......#
|
||||
#.###.#######.###.###.#.###.###.#.#######
|
||||
#...#.......#.#...#...#.............#...#
|
||||
#.#########.#######.#.#######.#######.###
|
||||
#...#.# F R I Z #.#.#.#
|
||||
#.###.# D E C H #.#.#.#
|
||||
#.#...# #...#.#
|
||||
#.###.# #.###.#
|
||||
#.#....OA WB..#.#..ZH
|
||||
#.###.# #.#.#.#
|
||||
CJ......# #.....#
|
||||
####### #######
|
||||
#.#....CK #......IC
|
||||
#.###.# #.###.#
|
||||
#.....# #...#.#
|
||||
###.### #.#.#.#
|
||||
XF....#.# RF..#.#.#
|
||||
#####.# #######
|
||||
#......CJ NM..#...#
|
||||
###.#.# #.###.#
|
||||
RE....#.# #......RF
|
||||
###.### X X L #.#.#.#
|
||||
#.....# F Q P #.#.#.#
|
||||
###.###########.###.#######.#########.###
|
||||
#.....#...#.....#.......#...#.....#.#...#
|
||||
#####.#.###.#######.#######.###.###.#.#.#
|
||||
#.......#.......#.#.#.#.#...#...#...#.#.#
|
||||
#####.###.#####.#.#.#.#.###.###.#.###.###
|
||||
#.......#.....#.#...#...............#...#
|
||||
#############.#.#.###.###################
|
||||
A O F N
|
||||
A A D M
|
||||
Reference in New Issue
Block a user