OJ链接 :139.单词拆分?
代码:
class Solution {
public boolean wordBreak(String s, List<String> wordDict) {
Set<String> set = new HashSet<String>(wordDict);
int n = s.length();
boolean[] dp = new boolean[n+1];
dp[0] = true;//初始化 保证后边正常
s = " " + s; //映射
for(int i =1;i<=n; i++){
for(int j =1;j<=i;j++){
if( dp[j-1]==true && set.contains(s.substring(j,i+1))){
dp[i]=true;
break;
}
}
}
return dp[n];
}
}
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