func_code_string: #include <bits/stdc++.h>   using namespace std;   map<int, bool> in;   int main() {     int n, mx = 0, arr[200], ans = 0;     char a[200];     cin >> n;     for (int i = 0; i < n; i++) {       cin >> a[i] >> arr[i];       if (a[i] ==  + ) {         in[arr[i]] = true;         mx++;       } else if (a[i] ==  - ) {         if (in[arr[i]]) {           mx--;           in[arr[i]] = false;         } else           ans++;       }       ans = max(mx, ans);     }     cout << ans;   }   