C - Brackets

 1 #include <iostream>
 2 #include <algorithm>
 3 #include <cstring>
 4 #include <cstdio>
 5 #include <string>
 6 #include <map>
 7 #include <cmath>
 8 #include <vector>
 9 
10 #define Faster ios::sync_with_stdio(false),cin.tie(0)
11 #define Read freopen("in.txt","r",stdin),freopen("out.txt","w",stdout)
12 #define Close fclose(stdin),fclose(stdout)
13 const int maxn = 150;
14 using namespace std;
15 const int MOD = 1e9+7;
16 typedef long long ll;
17 
18 ll dp[maxn][maxn];
19 string s;
20 
21 void solve(){
22     int len = s.size();
23     memset(dp, 0, sizeof(dp));
24 
25     for(int i = 1;i < len;i++){
26         for(int j = 0;j + i < len;j++){
27             int k = i+j;
28             if((s[j] == '(' &&  s[k] == ')') || (s[j] == '[' && s[k] == ']'))
29                 dp[j][k] = dp[j+1][k-1] + 2;
30             for(int l = j;l < k;l++){
31                 dp[j][k] = max(dp[j][l] + dp[l+1][k],dp[j][k]);
32             }
33         }
34     }
35     cout << dp[0][len-1] << endl;
36 }
37 
38 int main(){
39     Faster;
40     // string s;
41     while(cin >> s){
42         if(s == "end"){
43             break;
44         }
45         solve();
46     }
47     return 0;
48 }