59 lines
1.0 KiB
Go
59 lines
1.0 KiB
Go
package main
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import (
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"fmt"
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"io/ioutil"
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"strings"
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)
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// Returns 0 if we find the end of the path, '.' or '#' otherwise
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func getCoords(s []string, x, y int) rune {
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length := len(s)
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if y+1 >= length {
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return 0
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}
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width := len(s[y])
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if y < 0 || x < 0 { // off the map = no tree
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return '.'
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}
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return rune(s[y][x%width])
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}
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func main() {
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d, _ := ioutil.ReadFile("in3.txt")
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text := string(d)
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lines := strings.Split(text, "\n")
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paths := [][]int{
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{1, 1}, // {right,down}
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{3, 1},
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{5, 1},
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{7, 1},
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{1, 2},
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}
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total := 1 // this will have all the paths multiplied into it
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for _, p := range paths {
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x := 0
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y := 0 // start in the top-left corner
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trees := 0
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for {
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t := getCoords(lines, x, y)
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done := false
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switch t {
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case 0:
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done = true
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case '#':
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trees += 1
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}
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if done == true {
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break
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}
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//fmt.Printf("in3.txt:%d:%d: %#v\n", y+1, (x%len(lines[y]))+1, tree)
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x += p[0]
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y += p[1]
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}
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total = total * trees
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}
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fmt.Println(total)
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}
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