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Commit 93e6ca6

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add: Word Ladder
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‎README.md‎

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@@ -40,6 +40,7 @@ This is the solutions collection of my LeetCode submissions, most of them are pr
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|91|[Decode Ways](https://leetcode.com/problems/decode-ways/) | [JavaScript](./src/decode-ways/res.js)|Medium|
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|93|[Restore IP Addresses](https://leetcode.com/problems/restore-ip-addresses/) | [JavaScript](./src/restore-ip-addresses/res.js)|Medium|
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|120|[Triangle](https://leetcode.com/problems/triangle/) | [JavaScript](./src/triangle/res.js)|Medium|
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|127|[Word Ladder](https://leetcode.com/problems/word-ladder/) | [JavaScript](./src/word-ladder/res.js)|Medium|
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|130|[Surrounded Regions](https://leetcode.com/problems/surrounded-regions/) | [JavaScript](./src/surrounded-regions/res.js)|Medium|
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|133|[Clone Graph](https://leetcode.com/problems/clone-graph/) | [JavaScript](./src/clone-graph/res.js)|Medium|
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|136|[Single Number](https://leetcode.com/problems/single-number/) | [JavaScript](./src/single-number/res.js)|Easy|

‎src/word-ladder/res.js‎

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/**
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* res.js
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* @authors Joe Jiang (hijiangtao@gmail.com)
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* @date 2017年06月21日 23:22:33
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*
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* 127. Word Ladder
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* Problem: https://leetcode.com/problems/word-ladder/
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* Discuss: https://discuss.leetcode.com/category/135/word-ladder
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*
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* * Traditional
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* * Two-end BFS
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* * Dijkstra's algorithm
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*
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* @param {string} beginWord
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* @param {string} endWord
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* @param {string[]} wordList
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* @return {number}
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*/
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let ladderLength = function(beginWord, endWord, wordList) {
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wordList.push(endWord);
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let toVisit = new Set(),
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wordDict = new Set(wordList),
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dist = 2;
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if (wordList.length === wordDict.size) return 0;
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addNextWords(beginWord, wordDict, toVisit);
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while (toVisit.size > 0) {
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let entriesLen = toVisit.size,
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mark = 0;
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for (let item of toVisit.values()) {
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if (mark++ === entriesLen) break;
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toVisit.delete(item);
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if (item === endWord) return dist;
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addNextWords(item, wordDict, toVisit);
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}
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dist++;
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}
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return 0;
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};
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let addNextWords = function(word, wordDict, toVisit) {
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wordDict.delete(word);
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let len = word.length;
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for (let i=0; i<len; i++) {
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for (let j=97; j<123; j++) {
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let tmp = word.substring(0, i) + String.fromCharCode(j) + word.substring(i+1, len);
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if (wordDict.has(tmp)) {
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toVisit.add(tmp);
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wordDict.delete(tmp);
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}
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}
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}
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};

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