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[Java教程][LeetCode] Word Break


Given a string s and a dictionary of words dict, determine if s can be segmented into a space-separated sequence of one or more dictionary words.

For example, given
s = "leetcode",
dict = ["leet", "code"].

Return true because "leetcode" can be segmented as "leet code".

     这道题还是挺有难度的。重点是dynamic programming的应用。用boolean[]来判断true/false与否。记得除了contians()的条件外还要判断两个被分开的单词是否连在一起这样的问题。

     代码如下。~

public class Solution {  public boolean wordBreak(String s, Set<String> wordDict) {    if(s==null&&s.length()==0){      return false;    }    int len=s.length();        boolean[] test=new boolean[len];    for(int i=0;i<len;i++){      for(int j=0;j<=i;j++){        String sub=s.substring(j,i+1);        if(wordDict.contains(sub)&&(j==0||test[j-1])){          test[i]=true;          break;        }      }    }    return test[len-1];  }}