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package main
import (
"fmt"
"os"
"strconv"
"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 IVec2 struct {
x int
y int
}
type Robot struct {
Pos IVec2
Velocity IVec2
}
func parseInput(data string) []Robot {
var robots []Robot
for _, line := range strings.Split(data, "\n") {
var pos IVec2
var vel IVec2
if len(line) > 0 {
splitted_line := strings.Split(line, " ")
position := strings.Split(splitted_line[0][2:], ",")
velcocity := strings.Split(splitted_line[1][2:], ",")
pos.x, _ = strconv.Atoi(position[1])
pos.y, _ = strconv.Atoi(position[0])
vel.x, _ = strconv.Atoi(velcocity[1])
vel.y, _ = strconv.Atoi(velcocity[0])
robots = append(robots, Robot{Pos: pos, Velocity: vel})
}
}
return robots
}
type Grid = [][]int
func mod(a, b int) int {
r := a % b
if r < 0 {
r += b
}
return r
}
func printGrid(grid [][]int) {
for _, row := range grid {
for i, cell := range row {
if i != len(row)-1 {
fmt.Printf("%d,", cell)
} else {
fmt.Printf("%d", cell)
}
}
fmt.Println()
}
}
func plotMap(robots []Robot, height, width int) Grid {
grid := make([][]int, width)
for i := range grid {
grid[i] = make([]int, height)
}
for i := 0; i < width; i++ {
for j := 0; j < height; j++ {
grid[i][j] = 0
}
}
for _, robot := range robots {
grid[robot.Pos.x][robot.Pos.y] += 1
}
return grid
}
func plotNewMap(grid Grid, robots []Robot, height, width, seconds int) Grid {
for _, robot := range robots {
grid[robot.Pos.x][robot.Pos.y] -= 1
newPos := IVec2{x: mod(robot.Pos.x+robot.Velocity.x*seconds, width),
y: mod(robot.Pos.y+robot.Velocity.y*seconds, height)}
grid[newPos.x][newPos.y] += 1
}
return grid
}
func countQuadrants(grid Grid) int64 {
w, h := len(grid), len(grid[0])
quadrants := [4]int{0, 0, 0, 0}
for i := 0; i < w; i++ {
if i == w/2 {
continue
}
for j := 0; j < h; j++ {
if j == h/2 {
continue
}
row := 0
if i >= w/2 {
row = 1
}
col := 0
if j >= h/2 {
col = 1
}
quadrantIndex := row*2 + col
quadrants[quadrantIndex] += grid[i][j]
}
}
var ans int64 = 1
for _, cnt := range quadrants {
ans *= int64(cnt)
}
return ans
}
func solve_part_one(data string) int64 {
robots := parseInput(data)
// oldMap := plotMap(robots, 11, 7)
// newMap := plotNewMap(oldMap, robots, 11, 7, 100)
oldMap := plotMap(robots, 101, 103)
newMap := plotNewMap(oldMap, robots, 101, 103, 100)
ans := countQuadrants(newMap)
return ans
}
func solve_part_two(data string) int64 {
robots := parseInput(data)
// oldMap := plotMap(robots, 11, 7)
// newMap := plotNewMap(oldMap, robots, 11, 7, 100)
oldMap := plotMap(robots, 101, 103)
// newMap := plotNewMap(oldMap, robots, 101, 103, 100)
for i := 1; i <= 100; i++ {
newMap := plotNewMap(oldMap, robots, 101, 103, i)
printGrid(newMap)
fmt.Println()
}
// ans := countQuadrants(newMap)
return 42
}
func main() {
// test := FileRead("../input/day14.test")
prod := FileRead("../input/day14.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(prod))
}
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