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|
package main
import (
"fmt"
"os"
"strings"
)
func FileRead(path string) string {
file, err := os.ReadFile(path)
if err != nil {
fmt.Println("Couldn't Read file: ", err)
}
return string(file)
}
type Grid = [][]byte
type Point struct {
x int
y int
}
type Input struct {
warehouse Grid
directions []byte
}
func getRobotsPos(warehouse Grid) Point {
for i := 0; i < len(warehouse); i++ {
for j := 0; j < len(warehouse[0]); j++ {
if warehouse[i][j] == '@' {
return Point{i, j}
}
}
}
return Point{0, 0}
}
func parseInput(data string) Input {
splitted_data := strings.Split(data, "\n\n")
directions := []byte(splitted_data[1])
var warehouse Grid
for _, line := range strings.Split(splitted_data[0], "\n") {
row := []byte(line)
warehouse = append(warehouse, row)
}
return Input{
warehouse: warehouse,
directions: directions,
}
}
func printDirs(dirs []byte) {
for _, dir := range dirs {
fmt.Printf(string(dir))
}
}
func printGrid(grid [][]byte) {
for _, row := range grid {
for _, cell := range row {
fmt.Printf(string(cell))
}
fmt.Println()
}
}
func inBounds(x, y, w, h int) bool {
return x >= 0 && x < w && y >= 0 && y < h
}
func isBlock(x, y int, warehouse Grid) bool {
return warehouse[x][y] == 'O'
}
func isWall(x, y int, warehouse Grid) bool {
return warehouse[x][y] == '#'
}
func simulate(input Input) Grid {
dirMap := map[byte]Point{
'<': {0, -1},
'>': {0, 1},
'^': {-1, 0},
'v': {1, 0},
}
w, h := len(input.warehouse), len(input.warehouse[0])
robotPos := getRobotsPos(input.warehouse)
for _, dir := range input.directions {
dx, dy := dirMap[dir].x, dirMap[dir].y
nx, ny := robotPos.x+dx, robotPos.y+dy
// printGrid(input.warehouse)
if inBounds(nx, ny, w, h) && !isWall(nx, ny, input.warehouse) {
if input.warehouse[nx][ny] == '.' {
input.warehouse[nx][ny], input.warehouse[robotPos.x][robotPos.y] = input.warehouse[robotPos.x][robotPos.y], input.warehouse[nx][ny]
robotPos.x = nx
robotPos.y = ny
} else if isBlock(nx, ny, input.warehouse) {
step := 0
for isBlock(nx+dx*step, ny+dy*step, input.warehouse) {
step++
}
if !isWall(nx+dx*step, ny+dy*step, input.warehouse) {
for i := step; i >= 1; i-- {
input.warehouse[nx+dx*(i-1)][ny+dy*(i-1)], input.warehouse[nx+dx*(i)][ny+dy*(i)] = input.warehouse[nx+dx*(i)][ny+dy*(i)], input.warehouse[nx+dx*(i-1)][ny+dy*(i-1)]
}
input.warehouse[nx][ny], input.warehouse[robotPos.x][robotPos.y] = input.warehouse[robotPos.x][robotPos.y], input.warehouse[nx][ny]
robotPos.x = nx
robotPos.y = ny
}
}
}
}
return input.warehouse
}
func sumGpsCoordinates(warehouse Grid) int {
ans := 0
for i, row := range warehouse {
for j, cell := range row {
if cell == 'O' {
ans += i*100 + j
}
}
}
return ans
}
func solve_part_one(data string) int {
input := parseInput(data)
// printGrid(input.warehouse)
// printDirs(input.directions)
// fmt.Println()
warehosue := simulate(input)
return sumGpsCoordinates(warehosue)
}
func solve_part_two(data string) int {
return 42
}
func main() {
test := FileRead("../input/day15_1.test")
prod := FileRead("../input/day15.prod")
fmt.Println("Part_1 test: ", solve_part_one(test))
fmt.Println("Part_1 prod: ", solve_part_one(prod))
// fmt.Println("Part_2 test: ", solve_part_two(test))
// fmt.Println("Part_2 prod: ", solve_part_two(test))
}
|
