Day 6 done
Also included the logs of the app for the sample because they look kinda nice scrolling past
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day6/input
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day6/input
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297
day6/main.go
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297
day6/main.go
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package main
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import (
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"fmt"
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"strings"
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"sync"
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"git.mstar.dev/mstar/aoc24/util"
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"git.mstar.dev/mstar/goutils/sliceutils"
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)
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type MapState int
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type Map [][]MapState // Y, X
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type State struct {
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X, Y int
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Dir MapState
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}
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const (
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MapStateEmpty MapState = iota
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MapStateObstacle
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MapStateVisited
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MapStateGuardUp
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MapStateGuardDown
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MapStateGuardLeft
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MapStateGuardRight
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)
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func parseStringIntoMapLine(line string) []MapState {
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mapLine := []MapState{}
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for _, r := range line {
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switch r {
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case '.':
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mapLine = append(mapLine, MapStateEmpty)
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case '#':
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mapLine = append(mapLine, MapStateObstacle)
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case '^':
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mapLine = append(mapLine, MapStateGuardUp)
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case '>':
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mapLine = append(mapLine, MapStateGuardRight)
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case '<':
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mapLine = append(mapLine, MapStateGuardLeft)
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case 'v':
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mapLine = append(mapLine, MapStateGuardDown)
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default:
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}
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}
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return mapLine
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}
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func parseLinesIntoMap(lines []string) Map {
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outMap := Map{}
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for _, line := range lines {
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outMap = append(outMap, parseStringIntoMapLine(line))
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}
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return outMap
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}
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func (area Map) isGuardInMap() bool {
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for _, areaLine := range area {
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for _, cell := range areaLine {
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switch cell {
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case MapStateGuardUp, MapStateGuardDown, MapStateGuardLeft, MapStateGuardRight:
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return true
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}
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}
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}
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return false
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}
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func (area Map) getGuardPosition() (x, y int, ok bool) {
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for iy, line := range area {
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for ix, cell := range line {
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switch cell {
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case MapStateGuardUp, MapStateGuardDown, MapStateGuardLeft, MapStateGuardRight:
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return ix, iy, true
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}
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}
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}
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return -1, -1, false
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}
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func (area Map) advanceMap() State {
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// Find guard position first
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guardX, guardY, ok := area.getGuardPosition()
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if !ok {
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return State{}
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}
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dir := area[guardY][guardX]
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switch area[guardY][guardX] {
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case MapStateGuardDown:
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targetCellVal := area.get(guardX, guardY+1)
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if targetCellVal == MapStateObstacle {
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area.set(MapStateGuardLeft, guardX, guardY)
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} else {
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area.set(MapStateVisited, guardX, guardY)
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area.set(MapStateGuardDown, guardX, guardY+1)
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}
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case MapStateGuardUp:
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targetCellVal := area.get(guardX, guardY-1)
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if targetCellVal == MapStateObstacle {
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area.set(MapStateGuardRight, guardX, guardY)
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} else {
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area.set(MapStateVisited, guardX, guardY)
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area.set(MapStateGuardUp, guardX, guardY-1)
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}
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case MapStateGuardLeft:
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targetCellVal := area.get(guardX-1, guardY)
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if targetCellVal == MapStateObstacle {
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area.set(MapStateGuardUp, guardX, guardY)
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} else {
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area.set(MapStateVisited, guardX, guardY)
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area.set(MapStateGuardLeft, guardX-1, guardY)
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}
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case MapStateGuardRight:
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targetCellVal := area.get(guardX+1, guardY)
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if targetCellVal == MapStateObstacle {
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area.set(MapStateGuardDown, guardX, guardY)
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} else {
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area.set(MapStateVisited, guardX, guardY)
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area.set(MapStateGuardRight, guardX+1, guardY)
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}
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default:
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panic(fmt.Sprintf("Unknown guard state %v", area[guardY][guardX]))
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}
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return State{guardX, guardY, dir}
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}
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func (area Map) set(newState MapState, posX, posY int) {
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if posY >= len(area) || posY < 0 || posX >= len(area[0]) || posX < 0 {
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return
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}
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area[posY][posX] = newState
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}
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func (area Map) get(posX, posY int) MapState {
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if posY >= len(area) || posY < 0 || posX >= len(area[0]) || posX < 0 {
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return MapStateEmpty
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}
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return area[posY][posX]
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}
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func (area Map) countVisitedCells() int {
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acc := 0
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for _, line := range area {
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for _, elem := range line {
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if elem == MapStateVisited {
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acc += 1
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}
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}
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}
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return acc
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}
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func (area Map) printCurrentState() string {
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builder := strings.Builder{}
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for _, line := range area {
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for _, elem := range line {
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switch elem {
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case MapStateEmpty:
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builder.WriteString(".")
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case MapStateObstacle:
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builder.WriteString("#")
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case MapStateVisited:
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builder.WriteString("X")
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case MapStateGuardDown:
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builder.WriteString("v")
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case MapStateGuardUp:
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builder.WriteString("^")
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case MapStateGuardLeft:
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builder.WriteString("<")
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case MapStateGuardRight:
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builder.WriteString(">")
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}
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}
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builder.WriteString("\n")
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}
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return builder.String()
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}
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func (area Map) countEmptyCells() uint64 {
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var acc uint64 = 0
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for _, line := range area {
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for _, elem := range line {
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if elem == MapStateEmpty {
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acc++
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}
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}
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}
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return acc
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}
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func (area Map) getFieldGuardIsFacing() (MapState, int, int) {
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guardX, GuardY, found := area.getGuardPosition()
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// No guard on map, not what we want
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if !found {
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return -1, -1, -1
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}
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guard := area.get(guardX, GuardY)
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switch guard {
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case MapStateGuardLeft:
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return area.get(guardX-1, GuardY), guardX - 1, GuardY
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case MapStateGuardRight:
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return area.get(guardX+1, GuardY), guardX + 1, GuardY
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case MapStateGuardDown:
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return area.get(guardX, GuardY+1), guardX, GuardY + 1
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case MapStateGuardUp:
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return area.get(guardX, GuardY-1), guardX, GuardY - 1
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default:
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panic(fmt.Errorf("Invalid field found by guard finder: %v", guard))
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}
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}
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func (area Map) clone() Map {
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clone := Map{}
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for _, line := range area {
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newLine := []MapState{}
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for _, elem := range line {
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newLine = append(newLine, elem)
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}
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clone = append(clone, newLine)
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}
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return clone
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}
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func runCheck(area Map, addChan chan any, wg *sync.WaitGroup, isRoot bool) {
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checkedStates := []State{}
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for area.isGuardInMap() {
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if isRoot {
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nextElem, nextX, nextY := area.getFieldGuardIsFacing()
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// fmt.Printf("Guard in root is facing %d:%d of type %d\n", nextX, nextY, nextElem)
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// If is root and next field is empty, launch a new goroutine with that field being an obstacle
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if nextElem == MapStateEmpty {
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clone := area.clone()
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clone.set(MapStateObstacle, nextX, nextY)
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// fmt.Printf(
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// "Launching check for new state. State:\n%s\n\n",
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// clone.printCurrentState(),
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// )
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fmt.Println("Launching new alternative from root")
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wg.Add(1)
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go runCheck(clone, addChan, wg, false)
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}
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}
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nextState := area.advanceMap()
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// Check if state is already known
|
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if len(
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sliceutils.Filter(
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checkedStates,
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func(t State) bool { return t.Dir == nextState.Dir && t.X == nextState.X && t.Y == nextState.Y },
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),
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) > 0 {
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||||
// If it is, loop detected, report it back and exit
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wg.Done()
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addChan <- true
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fmt.Printf("Loop found, returning. IsRoot: %v\n", isRoot)
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return
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} else {
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checkedStates = append(checkedStates, nextState)
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}
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}
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// Guard no longer on map, report as done without loop
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wg.Done()
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fmt.Printf("Guard exited, returning. IsRoot: %v\n", isRoot)
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}
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func main() {
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inputLines := util.FileContentToNonEmptyLines(util.LoadFileFromArgs())
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// fullInput := sliceutils.Compact(
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// inputLines,
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// func(acc, next string) string { return acc + "\n" + next },
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// )
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area := parseLinesIntoMap(inputLines)
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for area.isGuardInMap() {
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area.advanceMap()
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// area.printCurrentState()
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}
|
||||
fmt.Printf("Task 1: %d\n", area.countVisitedCells())
|
||||
|
||||
untouchedArea := parseLinesIntoMap(inputLines)
|
||||
|
||||
acc := 0
|
||||
addChan := make(chan any, 1)
|
||||
wg := sync.WaitGroup{}
|
||||
go func() {
|
||||
for range addChan {
|
||||
acc++
|
||||
}
|
||||
}()
|
||||
wg.Add(1)
|
||||
go runCheck(untouchedArea.clone(), addChan, &wg, true)
|
||||
wg.Wait()
|
||||
close(addChan)
|
||||
fmt.Printf("Task 2: %d\n", acc)
|
||||
}
|
||||
10
day6/sample
Normal file
10
day6/sample
Normal file
|
|
@ -0,0 +1,10 @@
|
|||
....#.....
|
||||
.........#
|
||||
..........
|
||||
..#.......
|
||||
.......#..
|
||||
..........
|
||||
.#..^.....
|
||||
........#.
|
||||
#.........
|
||||
......#...
|
||||
85
day6/tmp
Normal file
85
day6/tmp
Normal file
|
|
@ -0,0 +1,85 @@
|
|||
Task 1: 41
|
||||
Launching new alternative from root
|
||||
Launching new alternative from root
|
||||
Launching new alternative from root
|
||||
Launching new alternative from root
|
||||
Guard exited, returning. IsRoot: false
|
||||
Guard exited, returning. IsRoot: false
|
||||
Launching new alternative from root
|
||||
Launching new alternative from root
|
||||
Guard exited, returning. IsRoot: false
|
||||
Guard exited, returning. IsRoot: false
|
||||
Guard exited, returning. IsRoot: false
|
||||
Launching new alternative from root
|
||||
Launching new alternative from root
|
||||
Launching new alternative from root
|
||||
Guard exited, returning. IsRoot: false
|
||||
Guard exited, returning. IsRoot: false
|
||||
Guard exited, returning. IsRoot: false
|
||||
Launching new alternative from root
|
||||
Guard exited, returning. IsRoot: false
|
||||
Launching new alternative from root
|
||||
Launching new alternative from root
|
||||
Guard exited, returning. IsRoot: false
|
||||
Guard exited, returning. IsRoot: false
|
||||
Guard exited, returning. IsRoot: false
|
||||
Launching new alternative from root
|
||||
Launching new alternative from root
|
||||
Launching new alternative from root
|
||||
Guard exited, returning. IsRoot: false
|
||||
Guard exited, returning. IsRoot: false
|
||||
Launching new alternative from root
|
||||
Launching new alternative from root
|
||||
Launching new alternative from root
|
||||
Guard exited, returning. IsRoot: false
|
||||
Guard exited, returning. IsRoot: false
|
||||
Guard exited, returning. IsRoot: false
|
||||
Launching new alternative from root
|
||||
Loop found, returning. IsRoot: false
|
||||
Launching new alternative from root
|
||||
Launching new alternative from root
|
||||
Guard exited, returning. IsRoot: false
|
||||
Guard exited, returning. IsRoot: false
|
||||
Guard exited, returning. IsRoot: false
|
||||
Launching new alternative from root
|
||||
Launching new alternative from root
|
||||
Launching new alternative from root
|
||||
Launching new alternative from root
|
||||
Launching new alternative from root
|
||||
Guard exited, returning. IsRoot: false
|
||||
Launching new alternative from root
|
||||
Guard exited, returning. IsRoot: false
|
||||
Launching new alternative from root
|
||||
Guard exited, returning. IsRoot: false
|
||||
Guard exited, returning. IsRoot: false
|
||||
Guard exited, returning. IsRoot: false
|
||||
Loop found, returning. IsRoot: false
|
||||
Launching new alternative from root
|
||||
Guard exited, returning. IsRoot: false
|
||||
Guard exited, returning. IsRoot: false
|
||||
Launching new alternative from root
|
||||
Launching new alternative from root
|
||||
Launching new alternative from root
|
||||
Launching new alternative from root
|
||||
Loop found, returning. IsRoot: false
|
||||
Launching new alternative from root
|
||||
Loop found, returning. IsRoot: false
|
||||
Guard exited, returning. IsRoot: false
|
||||
Launching new alternative from root
|
||||
Launching new alternative from root
|
||||
Launching new alternative from root
|
||||
Guard exited, returning. IsRoot: false
|
||||
Guard exited, returning. IsRoot: false
|
||||
Launching new alternative from root
|
||||
Guard exited, returning. IsRoot: false
|
||||
Guard exited, returning. IsRoot: false
|
||||
Guard exited, returning. IsRoot: false
|
||||
Loop found, returning. IsRoot: false
|
||||
Launching new alternative from root
|
||||
Launching new alternative from root
|
||||
Guard exited, returning. IsRoot: false
|
||||
Launching new alternative from root
|
||||
Guard exited, returning. IsRoot: true
|
||||
Loop found, returning. IsRoot: false
|
||||
Guard exited, returning. IsRoot: false
|
||||
Task 2: 6
|
||||
Loading…
Reference in a new issue