75 lines
1.1 KiB
Go
75 lines
1.1 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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"strings"
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)
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type cave struct {
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name string
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big bool
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leafs []int // index in caves array
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}
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var (
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caves = []cave{cave{name: "start"}, cave{name: "end"}}
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score = 0
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)
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const (
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START = 0
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END = 1
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)
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func getIdOrAdd(name string) int {
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for i, v := range caves {
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if v.name == name {
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return i
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}
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}
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caves = append(caves, cave{
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name: name,
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big: name[0] >= 'A' && name[0] <= 'Z',
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})
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return len(caves) - 1
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}
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func contains(id int, passed []int) bool {
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for _, v := range passed {
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if v == id {
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return true
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}
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}
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return false
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}
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func parcours(id int, passed []int) {
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if !caves[id].big {
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if contains(id, passed) {
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return
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}
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passed = append(passed, id)
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}
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for _, v := range caves[id].leafs {
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if v == END {
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score++
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continue
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}
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parcours(v, passed)
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}
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}
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func main() {
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scanner := bufio.NewScanner(os.Stdin)
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for scanner.Scan() {
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line := strings.Split(scanner.Text(), "-")
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a := getIdOrAdd(line[0])
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b := getIdOrAdd(line[1])
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caves[a].leafs = append(caves[a].leafs, b)
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caves[b].leafs = append(caves[b].leafs, a)
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}
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parcours(START, nil)
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fmt.Println(score)
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}
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