func_code_string: #include <bits/stdc++.h>   using namespace std;   int dr[] = {-1, 0, 1, 0, -1, 1, 1, -1};   int dc[] = {0, 1, 0, -1, 1, 1, -1, -1};   int main() {     ios::sync_with_stdio(0);     cin.tie(0);     int n;     while (cin >> n) {       vector<int> arr;       int st = 1;       int ans = 0;       for (int i = (0); i <= (2 * n - 1); i += (1)) {         string s;         cin >> s;         if (s ==  remove ) {           if (arr.empty()) {             st++;             continue;           }           if (st == arr[(int)arr.size() - 1]) {             st++;             arr.pop_back();           } else {             arr.clear();             st++;             ans++;           }         } else {           int nn;           cin >> nn;           arr.push_back(nn);         }       }       cout << ans << endl;     }     return 0;   }   