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day13,p1: utilize new A-Star pathfinder in GridToggle

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This commit is contained in:
Stefan Harmuth 2021-10-21 02:59:44 +02:00
parent 9bfc7ee244
commit 6868307aed
1 changed files with 16 additions and 46 deletions
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62
day13/day.go
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@ -7,6 +7,11 @@ import (
"tools"
)
type mazeNode struct {
x, y, nodeType int // ß = wall, 1 = path, 2 = start, 3 = target
neighbours []mazeNode
}
const mazeHangover int = 10
var favNumber, targetX, targetY int
@ -44,69 +49,34 @@ func buildMaze(maxX, maxY int) tools.GridToggle {
return maze
}
func printMaze(maze, path tools.GridToggle) {
func printMaze(maze tools.GridToggle, path []tools.Coordinate) {
pathMap := make(map[tools.Coordinate]int)
for i, c := range path {
pathMap[c] = i
}
for y := 0; y <= maze.MaxY; y++ {
for x := 0; x <= maze.MaxX; x++ {
if (x == targetX && y == targetY) || (x == 1 && y == 1) {
fmt.Print("X")
} else if path.State(x, y) {
} else if _, ok := pathMap[tools.Coordinate{X: x, Y: y}]; ok {
fmt.Print("O")
} else if maze.State(x, y) {
fmt.Print("#")
} else {
} else if !maze.State(x, y) {
fmt.Print(".")
} else {
fmt.Print("#")
}
}
fmt.Println()
}
}
func shortestPathToTarget(maze, visited tools.GridToggle, startX, startY int) tools.GridToggle {
minSteps := fullGrid.GetOnCount()
var newVisited tools.GridToggle
visited.Set(startX, startY, tools.On)
origVisited := visited.Copy()
if startX == targetX && startY == targetY {
return visited
}
toCheckList := []tools.Coordinate{
{startX - 1, startY},
{startX + 1, startY},
{startX, startY - 1},
{startX, startY + 1},
}
for _, toCheck := range toCheckList {
if toCheck.X < 0 || toCheck.Y < 0 || toCheck.X > maze.MaxX || toCheck.Y > maze.MaxY {
continue
}
if !maze.State(toCheck.X, toCheck.Y) && !visited.State(toCheck.X, toCheck.Y) {
newVisited = shortestPathToTarget(maze, origVisited.Copy(), toCheck.X, toCheck.Y)
if newVisited.State(targetX, targetY) && newVisited.GetOnCount() < minSteps {
minSteps = newVisited.GetOnCount()
visited = newVisited
}
}
}
if minSteps < fullGrid.GetOnCount() {
return visited
} else {
return fullGrid
}
}
func Part1(puzzle tools.AoCPuzzle) interface{} {
favNumber, targetX, targetY = parseInput(puzzle.GetInputArray())
maze := buildMaze(targetX+mazeHangover, targetY+mazeHangover)
path := shortestPathToTarget(maze, tools.NewGridToggle(), 1, 1)
path := maze.GetPathAStar(tools.Coordinate{X: 1, Y: 1}, tools.Coordinate{X: targetX, Y: targetY}, false)
printMaze(maze, path)
return path.GetOnCount() - 1
return len(path) - 1
}
func Part2(puzzle tools.AoCPuzzle) interface{} {