func_code_string: #include <bits/stdc++.h>   using ll = long long int;   using namespace std;   int main() {     int n;     cin >> n;     string s;     cin >> s;     int cnt = 0;     int negative = -1;     int ans = 0;     for (int i = 0; i < n; ++i) {       if (s[i] ==  ) )         --cnt;       else if (s[i] ==  ( )         ++cnt;       if (cnt < 0 && negative == -1) negative = i;       if (cnt == 0 && negative != -1) {         ans += i - negative + 1;         negative = -1;       }     }     if (cnt != 0) {       cout << -1 << endl;     } else {       cout << ans << endl;     }   }   