[ADD] Added day 20 solution
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Mika
parent
35cf750af8
commit
f0898004bb
3 changed files with 391 additions and 0 deletions
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20/input.txt
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141
20/input.txt
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|
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#...#...#...#.#...#.#.....#...#...#.........#.#.#.........#...#...#...#...#.#...#...#...#.......#.#...#.........#...#...#.#.#...#...#...#...#
|
||||
#######.#.#.#.#.###.#####.#.#######.#########.#.#.#######.###.###.#########.###.###.#.#########.#.#.###.#############.###.#.#.###.#.#.#.#.###
|
||||
###.....#.#.#.#...#.#.....#...###...#...#...#.#.#.......#...#.#...#...#.....###.#...#.#.........#...###.......#...#...###...#...#.#...#.#...#
|
||||
###.#####.#.#.###.#.#.#######.###.###.#.#.#.#.#.#######.###.#.#.###.#.#.#######.#.###.#.#####################.#.#.#.###########.#.#####.###.#
|
||||
#...#.....#.#...#...#.#...#...#...#...#.#.#.#.#...#.....#...#.#.#...#.#...###...#.###.#.............###...###...#.#.........#...#.....#.#...#
|
||||
#.###.#####.###.#####.#.#.#.###.###.###.#.#.#.###.#.#####.###.#.#.###.###.###.###.###.#############.###.#.#######.#########.#.#######.#.#.###
|
||||
#...#...###.....#.....#.#.#.#...#...###...#.#.#...#...###...#.#.#.###...#...#...#...#.#...#.......#...#.#.........#.........#...#...#.#.#...#
|
||||
###.###.#########.#####.#.#.#.###.#########.#.#.#####.#####.#.#.#.#####.###.###.###.#.#.#.#.#####.###.#.###########.###########.#.#.#.#.###.#
|
||||
###...#...#.......#.....#.#.#.#...###...#...#.#.....#.....#...#.#.#.....#...###.#...#.#.#.#.....#.#...#.#.....#...#...#.......#...#...#.....#
|
||||
#####.###.#.#######.#####.#.#.#.#####.#.#.###.#####.#####.#####.#.#.#####.#####.#.###.#.#.#####.#.#.###.#.###.#.#.###.#.#####.###############
|
||||
###...#...#...#...#.#.....#.#.#...#...#...#...#.....#...#.....#.#.#.....#...#...#.#...#.#.#...#.#.#...#.#...#.#.#...#...#...#.......#...#...#
|
||||
###.###.#####.#.#.#.#.#####.#.###.#.#######.###.#####.#.#####.#.#.#####.###.#.###.#.###.#.#.#.#.#.###.#.###.#.#.###.#####.#.#######.#.#.#.#.#
|
||||
#...#...#...#...#...#.....#.#.#...#.......#.###.....#.#...#...#.#...#...#...#...#.#.....#.#.#...#...#.#.#...#.#.###...#...#...#...#...#...#.#
|
||||
#.###.###.#.#############.#.#.#.#########.#.#######.#.###.#.###.###.#.###.#####.#.#######.#.#######.#.#.#.###.#.#####.#.#####.#.#.#########.#
|
||||
#...#.#...#...............#.#.#.#.........#.....#...#.#...#...#.#...#...#.#.....#.......#.#.......#.#.#.#.#...#.#.....#.....#.#.#.#...#...#.#
|
||||
###.#.#.###################.#.#.#.#############.#.###.#.#####.#.#.#####.#.#.###########.#.#######.#.#.#.#.#.###.#.#########.#.#.#.#.#.#.#.#.#
|
||||
###...#.....................#...#...............#.....#.......#...#####...#.............#.........#...#...#.....#...........#...#...#...#...#
|
||||
#############################################################################################################################################
|
||||
235
20/main.go
Normal file
235
20/main.go
Normal file
|
|
@ -0,0 +1,235 @@
|
|||
package main
|
||||
|
||||
import (
|
||||
"bufio"
|
||||
"fmt"
|
||||
"os"
|
||||
"time"
|
||||
)
|
||||
|
||||
const FILE_PATH = "./input.txt"
|
||||
|
||||
//const FILE_PATH = "./sample.txt"
|
||||
|
||||
func LoadInput(filename string) ([]string, error) {
|
||||
file, err := os.Open(filename)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
defer file.Close()
|
||||
|
||||
var lines []string
|
||||
scanner := bufio.NewScanner(file)
|
||||
for scanner.Scan() {
|
||||
lines = append(lines, scanner.Text())
|
||||
}
|
||||
|
||||
if err := scanner.Err(); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
return lines, nil
|
||||
}
|
||||
|
||||
type Vector2 struct {
|
||||
x int
|
||||
y int
|
||||
}
|
||||
|
||||
func add(a Vector2, b Vector2) Vector2 {
|
||||
return Vector2{a.x + b.x, a.y + b.y}
|
||||
}
|
||||
|
||||
var MOVEMENTS = []Vector2{
|
||||
{0, 1},
|
||||
{1, 0},
|
||||
{0, -1},
|
||||
{-1, 0},
|
||||
}
|
||||
|
||||
const (
|
||||
EMPTY = iota
|
||||
WALL = iota
|
||||
)
|
||||
|
||||
type Maze struct {
|
||||
field [][]int
|
||||
start Vector2
|
||||
end Vector2
|
||||
}
|
||||
|
||||
type structuredInput = Maze
|
||||
|
||||
func TransformInput(lines []string) structuredInput {
|
||||
var field = make([][]int, len(lines))
|
||||
var start Vector2
|
||||
var end Vector2
|
||||
|
||||
for y := 0; y < len(lines); y++ {
|
||||
field[y] = make([]int, len(lines[y]))
|
||||
for x := 0; x < len(lines[y]); x++ {
|
||||
if lines[y][x] == '#' {
|
||||
field[y][x] = WALL
|
||||
} else {
|
||||
field[y][x] = EMPTY
|
||||
}
|
||||
|
||||
if lines[y][x] == 'S' {
|
||||
start = Vector2{x, y}
|
||||
} else if lines[y][x] == 'E' {
|
||||
end = Vector2{x, y}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return Maze{field, start, end}
|
||||
}
|
||||
|
||||
func getLowestIndex(score [][]int, poss []Vector2) int {
|
||||
var index = 0
|
||||
var value = score[poss[0].y][poss[0].x]
|
||||
|
||||
for i := 1; i < len(poss); i++ {
|
||||
if score[poss[i].y][poss[i].x] < value {
|
||||
index = i
|
||||
value = score[poss[i].y][poss[i].x]
|
||||
}
|
||||
}
|
||||
|
||||
return index
|
||||
}
|
||||
|
||||
func findShortestLength(field [][]int, start Vector2, end Vector2) int {
|
||||
if start == end {
|
||||
return 0
|
||||
}
|
||||
|
||||
var poss = []Vector2{start}
|
||||
var score = make([][]int, len(field))
|
||||
for y := 0; y < len(field); y++ {
|
||||
score[y] = make([]int, len(field[y]))
|
||||
for x := 0; x < len(field[y]); x++ {
|
||||
score[y][x] = -1
|
||||
}
|
||||
}
|
||||
score[start.y][start.x] = 0
|
||||
|
||||
var index int
|
||||
var point Vector2
|
||||
var next Vector2
|
||||
for len(poss) > 0 {
|
||||
index = getLowestIndex(score, poss)
|
||||
point = poss[index]
|
||||
poss = append(poss[:index], poss[index+1:]...)
|
||||
|
||||
for i := 0; i < 4; i++ {
|
||||
next = add(point, MOVEMENTS[i])
|
||||
if field[next.y][next.x] == EMPTY && score[next.y][next.x] == -1 {
|
||||
if next == end {
|
||||
return score[point.y][point.x] + 1
|
||||
}
|
||||
score[next.y][next.x] = score[point.y][point.x] + 1
|
||||
poss = append(poss, next)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return -1
|
||||
}
|
||||
|
||||
func Part1(input structuredInput) int {
|
||||
var result = 0
|
||||
|
||||
var baseSpeed = findShortestLength(input.field, input.start, input.end)
|
||||
var tempSpeed int
|
||||
|
||||
for y := 1; y < len(input.field[y])-1; y++ {
|
||||
for x := 1; x < len(input.field[x])-1; x++ {
|
||||
if input.field[y][x] == WALL {
|
||||
input.field[y][x] = EMPTY
|
||||
tempSpeed = findShortestLength(input.field, input.start, input.end)
|
||||
|
||||
if baseSpeed-tempSpeed >= 100 {
|
||||
result++
|
||||
}
|
||||
|
||||
input.field[y][x] = WALL
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return result
|
||||
}
|
||||
|
||||
const RANGE = 20
|
||||
|
||||
func iabs(value int) int {
|
||||
if value < 0 {
|
||||
return value * -1
|
||||
}
|
||||
return value
|
||||
}
|
||||
|
||||
func Part2(input structuredInput) int {
|
||||
var result = 0
|
||||
|
||||
var baseSpeed = findShortestLength(input.field, input.start, input.end)
|
||||
|
||||
var lengthToEnd = make([][]int, len(input.field))
|
||||
var lengthToPoint = make([][]int, len(input.field))
|
||||
|
||||
for y := 0; y < len(input.field); y++ {
|
||||
lengthToEnd[y] = make([]int, len(input.field[y]))
|
||||
lengthToPoint[y] = make([]int, len(input.field[y]))
|
||||
for x := 0; x < len(input.field[y]); x++ {
|
||||
if input.field[y][x] == EMPTY {
|
||||
lengthToEnd[y][x] = findShortestLength(input.field, Vector2{x, y}, input.end)
|
||||
lengthToPoint[y][x] = findShortestLength(input.field, input.start, Vector2{x, y})
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
var speedToFinish int
|
||||
|
||||
for y1 := 0; y1 < len(input.field); y1++ {
|
||||
for x1 := 0; x1 < len(input.field[y1]); x1++ {
|
||||
if input.field[y1][x1] == EMPTY {
|
||||
for y2 := max(y1-RANGE, 0); y2 < min(y1+RANGE+1, len(input.field)); y2++ {
|
||||
for x2 := max(x1-RANGE, 0); x2 < min(x1+RANGE+1, len(input.field[y2])); x2++ {
|
||||
if iabs(y2-y1)+iabs(x2-x1) <= RANGE && input.field[y2][x2] == EMPTY {
|
||||
speedToFinish = lengthToPoint[y1][x1] + iabs(y2-y1) + iabs(x2-x1) + lengthToEnd[y2][x2]
|
||||
if baseSpeed-speedToFinish >= 100 {
|
||||
result++
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return result
|
||||
}
|
||||
|
||||
func main() {
|
||||
var start time.Time
|
||||
var elapsed time.Duration = 0
|
||||
input, err := LoadInput(FILE_PATH)
|
||||
if err != nil {
|
||||
fmt.Println("Error loading input:", err)
|
||||
return
|
||||
}
|
||||
|
||||
structuredInput := TransformInput(input)
|
||||
fmt.Println("Structured Input:", structuredInput)
|
||||
|
||||
start = time.Now()
|
||||
//fmt.Println("Solution Part 1: ", Part1(structuredInput))
|
||||
elapsed = time.Since(start)
|
||||
fmt.Printf("Part 1 took %s\n", elapsed)
|
||||
|
||||
start = time.Now()
|
||||
fmt.Println("Solution Part 2: ", Part2(structuredInput))
|
||||
elapsed = time.Since(start)
|
||||
fmt.Printf("Part 2 took %s\n", elapsed)
|
||||
}
|
||||
15
20/sample.txt
Normal file
15
20/sample.txt
Normal file
|
|
@ -0,0 +1,15 @@
|
|||
###############
|
||||
#...#...#.....#
|
||||
#.#.#.#.#.###.#
|
||||
#S#...#.#.#...#
|
||||
#######.#.#.###
|
||||
#######.#.#...#
|
||||
#######.#.###.#
|
||||
###..E#...#...#
|
||||
###.#######.###
|
||||
#...###...#...#
|
||||
#.#####.#.###.#
|
||||
#.#...#.#.#...#
|
||||
#.#.#.#.#.#.###
|
||||
#...#...#...###
|
||||
###############
|
||||
Loading…
Reference in a new issue