博客轉載請註明地址:http://blog.csdn.net/SunliyMonkey/article/details/48165711
題目描述
題目地址:https://leetcode.com/problems/interleaving-string/
給定三個字符串
樣例:
當
當
考察點
- 動態規劃
陷阱
無
Code
class Solution {
public:
bool isInterleave(string s1, string s2, string s3) {
vector <int> match[2];
int cur, nxt;
int l;
int l1 = s1.length();
int l2 = s2.length();
int l3 = s3.length();
if(l1+l2 != l3)
return false;
int *vis[2];
vis[0] = new int[l1+1];
vis[1] = new int[l1+1];
for(int i = 0; i <= l1; i++)
vis[0][i] = vis[1][i] = -1;
nxt = 0;
match[0].push_back(0);
for(int i = 0; i < l3; i++){
cur = nxt;
nxt = !nxt;
match[nxt].clear();
for(int k = 0; k < match[cur].size(); k++){
l = match[cur][k];
if(l < l1 && s1[l] == s3[i]){
if(vis[nxt][l+1] != i){
match[nxt].push_back(l+1);
vis[nxt][l+1] = i;
}
}
if(i-l+1 <= l2 && s2[i-l] == s3[i]){
if(vis[nxt][l] != i){
match[nxt].push_back(l);
vis[nxt][l] = i;
}
}
}
}
return !match[nxt].empty();
}
};