Plan for day 16 stands
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day16/input
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#.#.......#.....#.....#...#.#.#...#.#...#.#...#.#.#.#...#...#...#...........#...#.#...#.....#.#.#.....#...........#.....#.#...#.....#...#...#
|
||||||
|
#.#########.#########.#.#.#.#######.#.###.#.#.###.###.###.#.#.#.#.#########.###.#.#.#####.###.#.#.###.#####.#.#.#######.#.###.#.#######.#.###
|
||||||
|
#.........#.#.#.....#...#...........#.#.....#...#.#...#...#...#.#.#.........#...#...#...#...#.#...#.#.....#.#.#.....#...#.....#.....#...#.#.#
|
||||||
|
###.#.#####.#.#.###.#####.###########.#########.#.#.###.#####.#.#.#.#########.#######.#.###.#.#####.#####.#.#.###.###.#############.#.#.#.#.#
|
||||||
|
#.#.#.#.....#.#.#.#.......#.........#.....#.......#.#.#...#.....#.#.#...#.........#...#.#.....#.....#.....#.#...#.........#...............#.#
|
||||||
|
#.#.#.#.#####.#.#.#######.#.#####.#######.#######.#.#.#.#.#.#.#.#.#.###.#.#######.#.###.#####.###.#.#.#####.#.#########.###.#####.#.#.###.#.#
|
||||||
|
#...#.........#.#...#...#.#...#...#.....#...........#.#.#.#.#.#...#.#...#.#.....#...#.#.....#.#...#.#.......#.#.....#...#...#...#.#.#...#.#.#
|
||||||
|
#.###########.#.#.#.#.#.#.#.#.#####.###.#############.#.#.#.#.#.###.#.###.#.#.#######.#####.#.#.###.#######.###.###.#####.###.###.#.###.#.#.#
|
||||||
|
#.....#.....#...#.#...#...#.#.........#.............#...#.#.#...#...#.#...#.#...........#...#...#...#.............#.#.....#.....#.#...#...#.#
|
||||||
|
#####.#.#.###.#.###.#.#####.#########.#####.#######.#####.#.#####.###.#.###.#####.#####.#.#######.#.#.#########.#.#.#.#####.###.#.###.#####.#
|
||||||
|
#...#.#.#.....#...#.#.....#...#...#...#.....#.....#.#...#.#...#...#.....#...#.....#.#...#...#...#.........#.......#.#.....#.#...#.#.......#.#
|
||||||
|
#.###.#########.#.#.#####.#.###.#.#####.#########.#.#.#.#.#####.###.#####.###.#####.#.#####.###.###.###.#.###.#####.#.###.###.#.#.#.#####.#.#
|
||||||
|
#...#.........#.#.#.....#.#.#...#.#...#.#.......#.#...#.#.#.....#...#.....#...#.......#...#.#.....#.#...#.#...#.....#.#...#...#.#...#...#.#.#
|
||||||
|
#.#.#########.#.#.#.#####.###.###.#.#.#.#.###.#.#.#####.#.#.###.#.#########.###.#########.#.#.###.#.#.###.#.###.#####.#.#.#.###.#######.#.#.#
|
||||||
|
#.#.....#.....#.#.#.....#...#.#.#...#...#...#.#.#.....#.#.#.#.....#.........#.#...#.....#.#.#.......#...#.#.#...#.....#.#.....#...#.....#.#.#
|
||||||
|
###.###.###.#.###.#.#.#.###.#.#.#########.###.#.#.#.###.#.#.#.#.#####.#######.###.###.#.#.#.###.#.###.###.#.#.###.#####.#.###.#####.#.###.#.#
|
||||||
|
#...#.......#.....#.#...#.#...#...................#.#.....#.#.#.......#.........#.....#.#.#...#.....#.#...#.#...#...#...#...#.....#.#...#...#
|
||||||
|
#.#########.#######.#.#.#.#########.#.#####.###.#####.#####.#.#.#######.#.#############.#.###.###.###.#.###.###.#.###.###.#.#####.#.###.###.#
|
||||||
|
#.........#.#...#...#.#.......#.....#.#...#...#.#...#.#.....#.#.......#.#.......#.....#.#...#...#.#...#.#.....#.#.#...#.....#...#...#.#...#.#
|
||||||
|
#.#######.#.#.#.#.###.#######.#.###.#.#.#####.###.#.#.#.#####.#.#####.#####.###.#.###.#.#.#.###.###.###.#.###.#.#.#.###.#.###.#######.#.###.#
|
||||||
|
#.#.....#.#...#.#...#.......#...#...#...#.....#...#...........................#...#...#...#...#.....#.#.#.#.....#.#.........................#
|
||||||
|
#.#.###.#.#########.#.#####.#.#######.###.#####.#######.#.#.#.#.#####.#.#.#######.#.#####.#####.#####.#.#.#####.#.###.###.#####.#.###.#######
|
||||||
|
#.#.#...#.........#...................#...#.....#.....#...#.#.#.....#.#.#...#...#.#.......#...#.#.............................#.#.....#.....#
|
||||||
|
#.#.#.#.#######.#.#.#.#.#######.#######.###.#####.#.#######.#.#.###.#.#.###.#.#.#####.###.#.#.#.#.#####.#.#.#####.#.###.#.#.#.#.#.###.#.###.#
|
||||||
|
#.......#.#.....#.#...#.....#...#.....#.#...#.....#.#.......#.................#.#...#...#...#.#...#.....#.#.#.....#.#.#.....#.#.#...#.#.#...#
|
||||||
|
#.###.#.#.#.#########.#####.#.###.###.#.#.###.#####.#.#########.#.#####.#.###.#.#.#.#####.###.#####.#####.#.#######.#.###.###.#.#.#.#.#.#.###
|
||||||
|
#S....#...#...............#.......#...#.......#.....#...........#.......#.....#...#.......#.........#...............#...........#.#.....#...#
|
||||||
|
#############################################################################################################################################
|
||||||
129
day16/main.go
Normal file
129
day16/main.go
Normal file
|
|
@ -0,0 +1,129 @@
|
||||||
|
package main
|
||||||
|
|
||||||
|
import (
|
||||||
|
"math"
|
||||||
|
|
||||||
|
"git.mstar.dev/mstar/goutils/sliceutils"
|
||||||
|
|
||||||
|
"git.mstar.dev/mstar/aoc24/util"
|
||||||
|
)
|
||||||
|
|
||||||
|
// A crossing is a path location with 3 or 4 other paths next to it
|
||||||
|
type Crossing struct {
|
||||||
|
At util.Vec2
|
||||||
|
LowestScore int
|
||||||
|
LowestFrom int // Index into list of crossings
|
||||||
|
}
|
||||||
|
|
||||||
|
var (
|
||||||
|
DirUp = util.Vec2{X: 0, Y: -1}
|
||||||
|
DirRight = util.Vec2{X: 1, Y: 0}
|
||||||
|
DirDown = util.Vec2{X: 0, Y: 1}
|
||||||
|
DirLeft = util.Vec2{X: -1, Y: 0}
|
||||||
|
)
|
||||||
|
|
||||||
|
var startDir = DirRight
|
||||||
|
|
||||||
|
// Get the size of the bord
|
||||||
|
func getSize(lines []string) util.Vec2 {
|
||||||
|
return util.Vec2{X: int64(len(lines[0])), Y: int64(len(lines))}
|
||||||
|
}
|
||||||
|
|
||||||
|
// Count the paths next to a given positon
|
||||||
|
func countPathsAt(lines [][]rune, at util.Vec2) int {
|
||||||
|
center := lines[at.Y][at.X]
|
||||||
|
if center == '#' {
|
||||||
|
return 0
|
||||||
|
}
|
||||||
|
if center == 'E' {
|
||||||
|
return 1
|
||||||
|
}
|
||||||
|
if center == 'S' {
|
||||||
|
return 1
|
||||||
|
}
|
||||||
|
acc := 0
|
||||||
|
if util.SafeGet(lines, at.Up()) != '#' {
|
||||||
|
acc++
|
||||||
|
}
|
||||||
|
if util.SafeGet(lines, at.Down()) != '#' {
|
||||||
|
acc++
|
||||||
|
}
|
||||||
|
if util.SafeGet(lines, at.Left()) != '#' {
|
||||||
|
acc++
|
||||||
|
}
|
||||||
|
if util.SafeGet(lines, at.Right()) != '#' {
|
||||||
|
acc++
|
||||||
|
}
|
||||||
|
return acc
|
||||||
|
}
|
||||||
|
|
||||||
|
func findAllCrossings(lines [][]rune) []Crossing {
|
||||||
|
out := []Crossing{}
|
||||||
|
|
||||||
|
for iy, line := range lines {
|
||||||
|
for ix := range line {
|
||||||
|
vec := util.Vec2{X: int64(ix), Y: int64(iy)}
|
||||||
|
pathCount := countPathsAt(lines, vec)
|
||||||
|
if pathCount >= 3 {
|
||||||
|
out = append(out, Crossing{At: vec, LowestScore: math.MaxInt, LowestFrom: -1})
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
return out
|
||||||
|
}
|
||||||
|
|
||||||
|
// Convert a list of crossings into x y map of pointers to those crossings
|
||||||
|
func crossingListToPointerMap(crossings []Crossing) map[int64]map[int64]*Crossing {
|
||||||
|
return nil
|
||||||
|
}
|
||||||
|
|
||||||
|
func findStart(lines [][]rune) util.Vec2 {
|
||||||
|
for iy, line := range lines {
|
||||||
|
for ix, char := range line {
|
||||||
|
if char == 'S' {
|
||||||
|
return util.Vec2{X: int64(ix), Y: int64(iy)}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
// Return invalid positon if none found
|
||||||
|
return util.Vec2{X: -1, Y: -1}
|
||||||
|
}
|
||||||
|
|
||||||
|
func findEnd(lines [][]rune) util.Vec2 {
|
||||||
|
for iy, line := range lines {
|
||||||
|
for ix, char := range line {
|
||||||
|
if char == 'E' {
|
||||||
|
return util.Vec2{X: int64(ix), Y: int64(iy)}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
// Return invalid positon if none found
|
||||||
|
return util.Vec2{X: -1, Y: -1}
|
||||||
|
}
|
||||||
|
|
||||||
|
func walk(area [][]rune, from util.Vec2, dir util.Vec2) {
|
||||||
|
// Idea: walk forward from start until crossing or wall
|
||||||
|
// At crossing, defer a walker for both sides (if not walled off) but prioritise forwards
|
||||||
|
// Keep track of current score, one crossing = 1 point
|
||||||
|
// walking length doesn't matter because negligable compared to turn cost
|
||||||
|
// At crossing, check if own score is lower than current score
|
||||||
|
// If it is, update score and set own origin
|
||||||
|
|
||||||
|
// Special case:
|
||||||
|
// If at end, update end "crossing" following the earlier rules
|
||||||
|
}
|
||||||
|
|
||||||
|
func main() {
|
||||||
|
inputLines := util.FileContentToNonEmptyLines(util.LoadFileFromArgs())
|
||||||
|
// size := getSize(inputLines)
|
||||||
|
area := sliceutils.Map(inputLines, func(t string) []rune { return []rune(t) })
|
||||||
|
crossings := findAllCrossings(area)
|
||||||
|
|
||||||
|
start := findStart(area)
|
||||||
|
// Start always has the lowest score
|
||||||
|
crossings = append(crossings, Crossing{At: start, LowestScore: math.MinInt, LowestFrom: -1})
|
||||||
|
end := findEnd(area)
|
||||||
|
// While end is just another "crossing"
|
||||||
|
crossings = append(crossings, Crossing{At: end, LowestScore: math.MaxInt, LowestFrom: -1})
|
||||||
|
}
|
||||||
15
day16/sample
Normal file
15
day16/sample
Normal file
|
|
@ -0,0 +1,15 @@
|
||||||
|
###############
|
||||||
|
#.......#....E#
|
||||||
|
#.#.###.#.###.#
|
||||||
|
#.....#.#...#.#
|
||||||
|
#.###.#####.#.#
|
||||||
|
#.#.#.......#.#
|
||||||
|
#.#.#####.###.#
|
||||||
|
#...........#.#
|
||||||
|
###.#.#####.#.#
|
||||||
|
#...#.....#.#.#
|
||||||
|
#.#.#.###.#.#.#
|
||||||
|
#.....#...#.#.#
|
||||||
|
#.###.#.#.#.#.#
|
||||||
|
#S..#.....#...#
|
||||||
|
###############
|
||||||
17
day16/sample2
Normal file
17
day16/sample2
Normal file
|
|
@ -0,0 +1,17 @@
|
||||||
|
#################
|
||||||
|
#...#...#...#..E#
|
||||||
|
#.#.#.#.#.#.#.#.#
|
||||||
|
#.#.#.#...#...#.#
|
||||||
|
#.#.#.#.###.#.#.#
|
||||||
|
#...#.#.#.....#.#
|
||||||
|
#.#.#.#.#.#####.#
|
||||||
|
#.#...#.#.#.....#
|
||||||
|
#.#.#####.#.###.#
|
||||||
|
#.#.#.......#...#
|
||||||
|
#.#.###.#####.###
|
||||||
|
#.#.#...#.....#.#
|
||||||
|
#.#.#.#####.###.#
|
||||||
|
#.#.#.........#.#
|
||||||
|
#.#.#.#########.#
|
||||||
|
#S#.............#
|
||||||
|
#################
|
||||||
|
|
@ -10,3 +10,12 @@ func SliceSwap[T any](s []T, x, y int) {
|
||||||
s[x] = s[y]
|
s[x] = s[y]
|
||||||
s[y] = tmp
|
s[y] = tmp
|
||||||
}
|
}
|
||||||
|
|
||||||
|
func SafeGet[T any](s [][]T, at Vec2) T {
|
||||||
|
var none T
|
||||||
|
if at.X < 0 || at.Y < 0 || at.Y >= int64(len(s)) || at.X >= int64(len(s[0])) {
|
||||||
|
return none
|
||||||
|
}
|
||||||
|
|
||||||
|
return s[at.Y][at.X]
|
||||||
|
}
|
||||||
|
|
|
||||||
16
util/vec.go
16
util/vec.go
|
|
@ -15,3 +15,19 @@ func (v Vec2) Add(a Vec2) Vec2 {
|
||||||
func (v Vec2) Eq(a Vec2) bool {
|
func (v Vec2) Eq(a Vec2) bool {
|
||||||
return v.X == a.X && v.Y == a.Y
|
return v.X == a.X && v.Y == a.Y
|
||||||
}
|
}
|
||||||
|
|
||||||
|
func (v Vec2) Up() Vec2 {
|
||||||
|
return v.Add(Vec2{0, -1})
|
||||||
|
}
|
||||||
|
|
||||||
|
func (v Vec2) Down() Vec2 {
|
||||||
|
return v.Add(Vec2{0, 1})
|
||||||
|
}
|
||||||
|
|
||||||
|
func (v Vec2) Left() Vec2 {
|
||||||
|
return v.Add(Vec2{-1, 0})
|
||||||
|
}
|
||||||
|
|
||||||
|
func (v Vec2) Right() Vec2 {
|
||||||
|
return v.Add(Vec2{1, 0})
|
||||||
|
}
|
||||||
|
|
|
||||||
Loading…
Reference in a new issue