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Commit93e6ca6

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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 2017-06-21 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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letladderLength=function(beginWord,endWord,wordList){
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wordList.push(endWord);
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lettoVisit=newSet(),
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wordDict=newSet(wordList),
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dist=2;
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if(wordList.length===wordDict.size)return0;
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addNextWords(beginWord,wordDict,toVisit);
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while(toVisit.size>0){
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letentriesLen=toVisit.size,
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mark=0;
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for(letitemoftoVisit.values()){
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if(mark++===entriesLen)break;
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toVisit.delete(item);
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if(item===endWord)returndist;
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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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return0;
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};
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letaddNextWords=function(word,wordDict,toVisit){
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wordDict.delete(word);
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letlen=word.length;
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for(leti=0;i<len;i++){
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for(letj=97;j<123;j++){
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lettmp=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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