Word Break 

 1 public class Solution {
 2     public boolean wordBreak(String s, Set<String> wordDict) {
 3         int len = s.length();
 4         boolean[] isValidStart = new boolean[len+1];
 5         isValidStart[0] = true;
 6 
 7         for(int i = 0; i < len; i++) {
 8             if(!isValidStart[i]) {
 9                 continue;
10             }
11             for(int j = i + 1; j <= len; j++) {
12                 String sub = s.substring(i, j);
13                 if(wordDict.contains(sub)) {
14                     isValidStart[j] = true;
15                     if(isValidStart[len]) {
16                         return true;
17                     }
18                 }
19             }
20         }
21 
22         return false;
23     }
24 }

 

posted @ 2016-02-18 11:01  一切不期而至  阅读(170)  评论(0)  编辑  收藏  举报