Create 0127-word-ladder.go

Accepted submission: _https://leetcode.com/submissions/detail/871401854/_

go/0127-word-ladder.go

@@ -0,0 +1,47 @@
+func ladderLength(beginWord string, endWord string, wordList []string) int {
+ if !contains(wordList, endWord) {
+ return 0
+ }
+
+ nei := make(map[string][]string)
+ wordList = append(wordList, beginWord)
+ for _, word := range wordList {
+ for j := 0; j < len(word); j++ {
+ pattern := word[:j] + "*" + word[j + 1:]
+ nei[pattern] = append(nei[pattern], word)
+ }
+ }
+
+ visit := map[string]bool{beginWord: true}
+ q := []string{beginWord}
+ res := 1
+ for len(q) != 0 {
+ for tmp := len(q); tmp > 0; tmp-- {
+ word := q[0]
+ q = q[1:]
+ if word == endWord {
+ return res
+ }
+ for j := 0; j < len(word); j++ {
+ pattern := word[:j] + "*" + word[j + 1:]
+ for _, neiWord := range nei[pattern] {
+ if !visit[neiWord] {
+ visit[neiWord] = true
+ q = append(q, neiWord)
+ }
+ }
+ }
+ }
+ res += 1
+ }
+ return 0
+}
+
+func contains(s []string, word string) bool {
+ for _, element := range s {
+ if element == word {
+ return true
+ }
+ }
+ return false
+}