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Day 6 done

Browse source 
Also included the logs of the app for the sample because they look kinda
nice scrolling past
This commit is contained in:
Melody Becker 2024-12-06 22:41:21 +01:00
parent 6dad1566a7
commit 1014cbb42c
4 changed files with 522 additions and 0 deletions
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package main
import (
"fmt"
"strings"
"sync"
"git.mstar.dev/mstar/aoc24/util"
"git.mstar.dev/mstar/goutils/sliceutils"
)
type MapState int
type Map [][]MapState // Y, X
type State struct {
X, Y int
Dir MapState
}
const (
MapStateEmpty MapState = iota
MapStateObstacle
MapStateVisited
MapStateGuardUp
MapStateGuardDown
MapStateGuardLeft
MapStateGuardRight
)
func parseStringIntoMapLine(line string) []MapState {
mapLine := []MapState{}
for _, r := range line {
switch r {
case '.':
mapLine = append(mapLine, MapStateEmpty)
case '#':
mapLine = append(mapLine, MapStateObstacle)
case '^':
mapLine = append(mapLine, MapStateGuardUp)
case '>':
mapLine = append(mapLine, MapStateGuardRight)
case '<':
mapLine = append(mapLine, MapStateGuardLeft)
case 'v':
mapLine = append(mapLine, MapStateGuardDown)
default:
}
}
return mapLine
}
func parseLinesIntoMap(lines []string) Map {
outMap := Map{}
for _, line := range lines {
outMap = append(outMap, parseStringIntoMapLine(line))
}
return outMap
}
func (area Map) isGuardInMap() bool {
for _, areaLine := range area {
for _, cell := range areaLine {
switch cell {
case MapStateGuardUp, MapStateGuardDown, MapStateGuardLeft, MapStateGuardRight:
return true
}
}
}
return false
}
func (area Map) getGuardPosition() (x, y int, ok bool) {
for iy, line := range area {
for ix, cell := range line {
switch cell {
case MapStateGuardUp, MapStateGuardDown, MapStateGuardLeft, MapStateGuardRight:
return ix, iy, true
}
}
}
return -1, -1, false
}
func (area Map) advanceMap() State {
// Find guard position first
guardX, guardY, ok := area.getGuardPosition()
if !ok {
return State{}
}
dir := area[guardY][guardX]
switch area[guardY][guardX] {
case MapStateGuardDown:
targetCellVal := area.get(guardX, guardY+1)
if targetCellVal == MapStateObstacle {
area.set(MapStateGuardLeft, guardX, guardY)
} else {
area.set(MapStateVisited, guardX, guardY)
area.set(MapStateGuardDown, guardX, guardY+1)
}
case MapStateGuardUp:
targetCellVal := area.get(guardX, guardY-1)
if targetCellVal == MapStateObstacle {
area.set(MapStateGuardRight, guardX, guardY)
} else {
area.set(MapStateVisited, guardX, guardY)
area.set(MapStateGuardUp, guardX, guardY-1)
}
case MapStateGuardLeft:
targetCellVal := area.get(guardX-1, guardY)
if targetCellVal == MapStateObstacle {
area.set(MapStateGuardUp, guardX, guardY)
} else {
area.set(MapStateVisited, guardX, guardY)
area.set(MapStateGuardLeft, guardX-1, guardY)
}
case MapStateGuardRight:
targetCellVal := area.get(guardX+1, guardY)
if targetCellVal == MapStateObstacle {
area.set(MapStateGuardDown, guardX, guardY)
} else {
area.set(MapStateVisited, guardX, guardY)
area.set(MapStateGuardRight, guardX+1, guardY)
}
default:
panic(fmt.Sprintf("Unknown guard state %v", area[guardY][guardX]))
}
return State{guardX, guardY, dir}
}
func (area Map) set(newState MapState, posX, posY int) {
if posY >= len(area) || posY < 0 || posX >= len(area[0]) || posX < 0 {
return
}
area[posY][posX] = newState
}
func (area Map) get(posX, posY int) MapState {
if posY >= len(area) || posY < 0 || posX >= len(area[0]) || posX < 0 {
return MapStateEmpty
}
return area[posY][posX]
}
func (area Map) countVisitedCells() int {
acc := 0
for _, line := range area {
for _, elem := range line {
if elem == MapStateVisited {
acc += 1
}
}
}
return acc
}
func (area Map) printCurrentState() string {
builder := strings.Builder{}
for _, line := range area {
for _, elem := range line {
switch elem {
case MapStateEmpty:
builder.WriteString(".")
case MapStateObstacle:
builder.WriteString("#")
case MapStateVisited:
builder.WriteString("X")
case MapStateGuardDown:
builder.WriteString("v")
case MapStateGuardUp:
builder.WriteString("^")
case MapStateGuardLeft:
builder.WriteString("<")
case MapStateGuardRight:
builder.WriteString(">")
}
}
builder.WriteString("\n")
}
return builder.String()
}
func (area Map) countEmptyCells() uint64 {
var acc uint64 = 0
for _, line := range area {
for _, elem := range line {
if elem == MapStateEmpty {
acc++
}
}
}
return acc
}
func (area Map) getFieldGuardIsFacing() (MapState, int, int) {
guardX, GuardY, found := area.getGuardPosition()
// No guard on map, not what we want
if !found {
return -1, -1, -1
}
guard := area.get(guardX, GuardY)
switch guard {
case MapStateGuardLeft:
return area.get(guardX-1, GuardY), guardX - 1, GuardY
case MapStateGuardRight:
return area.get(guardX+1, GuardY), guardX + 1, GuardY
case MapStateGuardDown:
return area.get(guardX, GuardY+1), guardX, GuardY + 1
case MapStateGuardUp:
return area.get(guardX, GuardY-1), guardX, GuardY - 1
default:
panic(fmt.Errorf("Invalid field found by guard finder: %v", guard))
}
}
func (area Map) clone() Map {
clone := Map{}
for _, line := range area {
newLine := []MapState{}
for _, elem := range line {
newLine = append(newLine, elem)
}
clone = append(clone, newLine)
}
return clone
}
func runCheck(area Map, addChan chan any, wg *sync.WaitGroup, isRoot bool) {
checkedStates := []State{}
for area.isGuardInMap() {
if isRoot {
nextElem, nextX, nextY := area.getFieldGuardIsFacing()
// fmt.Printf("Guard in root is facing %d:%d of type %d\n", nextX, nextY, nextElem)
// If is root and next field is empty, launch a new goroutine with that field being an obstacle
if nextElem == MapStateEmpty {
clone := area.clone()
clone.set(MapStateObstacle, nextX, nextY)
// fmt.Printf(
// "Launching check for new state. State:\n%s\n\n",
// clone.printCurrentState(),
// )
fmt.Println("Launching new alternative from root")
wg.Add(1)
go runCheck(clone, addChan, wg, false)
}
}
nextState := area.advanceMap()
// Check if state is already known
if len(
sliceutils.Filter(
checkedStates,
func(t State) bool { return t.Dir == nextState.Dir && t.X == nextState.X && t.Y == nextState.Y },
),
) > 0 {
// If it is, loop detected, report it back and exit
wg.Done()
addChan <- true
fmt.Printf("Loop found, returning. IsRoot: %v\n", isRoot)
return
} else {
checkedStates = append(checkedStates, nextState)
}
}
// Guard no longer on map, report as done without loop
wg.Done()
fmt.Printf("Guard exited, returning. IsRoot: %v\n", isRoot)
}
func main() {
inputLines := util.FileContentToNonEmptyLines(util.LoadFileFromArgs())
// fullInput := sliceutils.Compact(
// inputLines,
// func(acc, next string) string { return acc + "\n" + next },
// )
area := parseLinesIntoMap(inputLines)
for area.isGuardInMap() {
area.advanceMap()
// area.printCurrentState()
}
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)
}

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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