DP。注意曾经把赋值写成了==，结果出错半天。
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bool
isInterleaving(string &str1, string &str2, string &str3) { int
n = str1.length(); int
m = str2.length(); int
k = str3.length(); if
(n + m != k) return
false; vector<vector<bool> > dp(n+1); for
(int
i = 0; i < n+1; i++) { dp[i].resize(m+1); } dp[0][0] = true; for
(int
i = 0; i <= n; i++) { for
(int
j = 0; j <= m; j++) { if
(i == 0 && j == 0) { dp[0][0] = true; } else
if
(i == 0) { dp[0][j] = dp[0][j-1] && str2[j-1] == str3[j-1]; } else
if
(j == 0) { dp[i][0] = dp[i-1][0] && str1[i-1] == str3[i-1]; } else
{ dp[i][j] = (dp[i-1][j] && str1[i-1] == str3[i+j-1]) || (dp[i][j-1] && str2[j-1] == str3[i+j-1]); } } } return
dp[n][m];} |
原文：http://www.cnblogs.com/lautsie/p/3526347.html