leetcode--007 word break I

 1 package leetcode;
 2 
 3 import java.util.Set;
 4 
 5 public class WordBreak11 {
 6     public boolean wordBreak(String s, Set<String> dict) {
 7         if(s==null||s.length()==0||dict==null||dict.size()==0){
 8             return false;
 9         }
10         int len = s.length();
11         boolean[] can=new boolean[len+1];
12         can[0]=true;
13         for(int i=1;i<=len;i++){
14             for(int j=0;j<i;j++){
15                 if(can[j]&&dict.contains(s.substring(j,i))){
16                     can[i]=true;
17                     break;
18                 }
19             }
20         }
21         return can[len];
22     }
23 }