func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     string n;     int count = 0;     cin >> n;     stack<char> s;     for (int i = 0; i < n.length(); i++) {       if (n[i] ==  ( ) {         s.push(n[i]);       } else if (n[i] ==  ) ) {         if (s.size() != 0) {           char tops = s.top();           s.pop();           if (tops ==  ( ) {             count += 2;           }         }       }     }     cout << count << endl;     return 0;   }   