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leetcode - Interleaving String

2013-04-21 10:32  张汉生  阅读(152)  评论(0)  编辑  收藏  举报

题目描述：点击此处

 1 class Solution {
 2 public:
 3   bool isInterleave(string s1, string s2, string s3) {
 4     // Start typing your C/C++ solution below
 5     // DO NOT write int main() function    
 6     int len1 = s1.length();
 7     int len2 = s2.length();
 8     int len3 = s3.length();
 9     if (len1+len2 != len3)
10       return false;
11     if (len1==0)
12       return s2==s3;
13     if (len2==0)
14       return s1==s3;
15     bool ** flag = new bool *[len1+1];
16     int i, j;
17     for (i=0; i<=len1; i++){
18       flag[i] = new bool[len2+1];
19       for (j=0; j<=len2; j++)
20         flag[i][j] = false;
21     }
22     flag[0][0] = true;
23     for (i=0; i<=len1; i++){
24       for (j=0; j<=len2; j++){
25         if (i>0 && s1[i-1]==s3[i+j-1] && flag[i-1][j])
26           flag[i][j] = true;
27         if (j>0 && s2[j-1]==s3[i+j-1] && flag[i][j-1])
28           flag[i][j] = true;
29       }
30     }
31     bool rlt = flag[len1][len2];
32     for (i=0; i<=len1; i++)
33       delete[] flag[i];
34     delete []flag;
35     return rlt;
36   }
37 };