40 lines
679 B
Go
40 lines
679 B
Go
package main
|
|
|
|
import (
|
|
"AoC2020/helper"
|
|
"fmt"
|
|
"os"
|
|
)
|
|
|
|
func main() {
|
|
args := os.Args[1:]
|
|
input, err := helper.GetInput(args[0])
|
|
if err != nil {
|
|
fmt.Println(err)
|
|
}
|
|
fmt.Println(day3(input, 3, 1))
|
|
fmt.Println(day3Part2(input, [][]int{{1, 1}, {3, 1}, {5, 1}, {7, 1}, {1, 2}}))
|
|
}
|
|
|
|
func day3Part2(input []string, slopes [][]int) int {
|
|
result := 1
|
|
for _, slope := range slopes {
|
|
result = result * day3(input, slope[0], slope[1])
|
|
}
|
|
return result
|
|
}
|
|
|
|
func day3(input []string, right int, down int) int {
|
|
count := 0
|
|
x := 0
|
|
y := 0
|
|
for y < len(input) {
|
|
if string(input[y][x]) == "#" {
|
|
count++
|
|
}
|
|
x = (x + right) % (len(input[0]))
|
|
y = y + down
|
|
}
|
|
return count
|
|
}
|