134 lines
2.3 KiB
Go
134 lines
2.3 KiB
Go
package main
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import (
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"bufio"
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"fmt"
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"os"
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"strconv"
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)
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func main() {
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content := returnContent("../input")
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//content := returnContent("../testInput")
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octopuses := map[Coordinate]int{}
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answer := 0
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width := 0
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height := len(*content)
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//Insert octopuses into a map
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for y, row := range *content {
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width = len(row)
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for x, val := range row {
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octopuses[Coordinate{X: x, Y: y}] = val
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}
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}
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for i := 0; i < 100; i++ {
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flashers := map[Coordinate]bool{}
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for coord := range octopuses {
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octopuses[coord]++
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}
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for {
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complete := true
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for coord, energy := range octopuses {
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if energy > 9 && !flashers[coord] {
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complete = false
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flashers[coord] = true
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answer++
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for _, neighbour := range coord.Neighbours(width, height, true) {
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octopuses[neighbour]++
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}
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}
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}
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if complete {
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break
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}
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}
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for coord, flashed := range flashers {
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if flashed {
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octopuses[coord] = 0
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}
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}
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}
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fmt.Println(*content)
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fmt.Println(answer)
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}
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//Coordinate Class
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type Coordinate struct {
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X int
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Y int
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}
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func (c *Coordinate) Neighbours(gridWidth int, gridHeight int, diagonal bool) (out []Coordinate) {
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spaceLeft := c.X > 0
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spaceRight := c.X < gridWidth-1
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spaceUp := c.Y > 0
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spaceDown := c.Y < gridHeight-1
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if spaceLeft {
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out = append(out, Coordinate{c.X - 1, c.Y})
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}
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if spaceRight {
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out = append(out, Coordinate{c.X + 1, c.Y})
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}
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if spaceUp {
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out = append(out, Coordinate{c.X, c.Y - 1})
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}
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if spaceDown {
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out = append(out, Coordinate{c.X, c.Y + 1})
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}
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if diagonal {
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if spaceUp && spaceLeft {
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out = append(out, Coordinate{c.X - 1, c.Y - 1})
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}
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if spaceUp && spaceRight {
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out = append(out, Coordinate{c.X + 1, c.Y - 1})
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}
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if spaceDown && spaceLeft {
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out = append(out, Coordinate{c.X - 1, c.Y + 1})
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}
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if spaceDown && spaceRight {
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out = append(out, Coordinate{c.X + 1, c.Y + 1})
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}
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}
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return
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}
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func returnContent(path string) *[][]int {
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//read file and return it as an array of integers
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file, err := os.Open(path)
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var content [][]int
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if err != nil {
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fmt.Println("Unlucky, the file didn't open")
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return &content
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}
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defer file.Close()
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scanner := bufio.NewScanner(file)
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for scanner.Scan() {
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nums := []int{}
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for _, char := range scanner.Text() {
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num, _ := strconv.Atoi(string(char))
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nums = append(nums, num)
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}
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content = append(content, nums)
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}
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return &content
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}
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