func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long mxN = 1e5 + 5;   const long long INF = 1e18;   const long long mod = 1e9 + 7;   signed main() {     long long n;     cin >> n;     vector<string> v(n);     for (long long i = 0; i < n; i++) {       cin >> v[i];     }     map<long long, long long> o, c;     long long per = 0;     for (long long i = 0; i < n; i++) {       string s = v[i];       stack<long long> st;       for (auto x : s) {         if (st.empty()) {           st.push(x);         } else {           if (x ==  ) ) {             if (st.top() ==  ( )               st.pop();             else               st.push(x);           } else             st.push(x);         }       }       if (st.empty())         per++;       else {         long long open = 0, closing = 0;         while (!st.empty()) {           if (st.top() ==  ) )             open++;           else             closing++;           st.pop();         }         if (open == 0) {           c[closing]++;         }         if (closing == 0) {           o[open]++;         }       }     }     long long ans = per / 2;     for (auto x : o) {       ans += min(x.second, c[x.first]);     }     cout << ans;   }   