leetCode.97. 交错字符串

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题目思路

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代码

class Solution {
public:bool isInterleave(string s1, string s2, string s3) {int n = s1.size(), m = s2.size();if ( s3.size() != n + m ) return false;vector<vector<bool>> f( n + 1, vector<bool> (m + 1));s1 = ' ' + s1;s2 = ' ' + s2;s3 = ' ' + s3;for ( int i = 0; i <= n; ++ i) {for (int j = 0; j <= m; ++j ) {if ( !i && !j ) f[i][j] = true;else {if ( i && s1[i] == s3[i + j]) f[i][j] = f[i - 1][j];if ( j && s2[j] == s3[i + j]) f[i][j] = f[i][j] || f[i][j - 1];}}}return f[n][m];}
};