hdu 6170 Two strings dp 

 1 #include<cstdio>
 2 #include<cstdlib>
 3 #include<cstring>
 4 #include<string>
 5 #include<algorithm>
 6 #include<iostream>
 7 #include<queue>
 8 #include<map>
 9 #include<cmath>
10 #include<set>
11 #include<stack>
12 
13 using namespace std;
14 
15 char dp[2505][2505];
16 string a,b;
17 
18 int main()
19 {
20     int t;
21     cin>>t;
22     while(t--)
23     {
24         memset(dp,-1,sizeof(dp));
25         cin>>a>>b;
26         dp[0][0] = 0;
27         for(int i = 0; i <= a.length(); i++)
28         {
29             for(int j = 1; j <= b.length(); j++)
30             {
31                 if(a[i-1]==b[j-1] && dp[i-1][j-1]!=-1 && i!=0)  //非. * ，直接匹配
32                     dp[i][j] = a[i-1];
33                 else
34                     if(b[j-1]=='.' && dp[i-1][j-1]!=-1 && i!=0) //.
35                         dp[i][j] = a[i-1];
36                 if(b[j-1]=='*')
37                 {
38                     if(dp[i-1][j-1]==a[i-1])    //重复前一个
39                         dp[i][j] = a[i-1];
40                     else
41                         if(dp[i-1][j]==a[i-1])    //重复当前的
42                             dp[i][j] = a[i-1];
43                     else
44                         if(dp[i][j-2]!=-1 || dp[i][j-1]!=-1)    //匹配空串
45                             dp[i][j] = 0;
46                 }
47                     
48             }
49         }
50         if(dp[a.length()][b.length()]!=-1)
51             cout<<"yes"<<endl;
52         else
53             cout<<"no"<<endl;
54         
55     }
56     return 0;
57 }

 

posted @ 2017-08-22 20:35  Xycdada  阅读(102)  评论(0)    收藏  举报