66 lines
1.0 KiB
Go
66 lines
1.0 KiB
Go
package dayfour
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import (
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"os"
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"strings"
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"advent-of-code/internal/registry"
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)
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type position struct {
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row, column int
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}
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func init() {
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registry.Register("2025D4", ParseInput, PartOne, PartTwo)
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}
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func ParseInput(filepath string) []string {
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content, _ := os.ReadFile(filepath)
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return strings.Split(string(content), "\n")
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}
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func PartOne(data []string) int {
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isRoll := make(map[position]bool)
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for row := range data {
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for column := 0; column < len(data[row]); column++ {
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if data[row][column] == '@' {
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isRoll[position{row, column}] = true
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}
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}
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}
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accessibleRolls := 0
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directions := []position{
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{-1, -1},
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{-1, 0},
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{-1, 1},
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{0, -1},
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{0, 1},
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{1, -1},
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{1, 0},
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{1, 1},
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}
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for pos := range isRoll {
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adjacentRolls := 0
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for _, direction := range directions {
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neighbor := position{pos.row + direction.row, pos.column + direction.column}
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if isRoll[neighbor] {
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adjacentRolls++
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}
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}
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if adjacentRolls < 4 {
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accessibleRolls++
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}
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}
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return accessibleRolls
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}
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func PartTwo(data []string) int {
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return 0
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}
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