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  1. #include <iostream>
  2. #include <fstream>
  3. #include <map>
  4. std::map<long long int, int> libri;
  5. using namespace std;
  6.  
  7. // Declaring functions
  8. void aggiungi(long long int id);
  9. void togli(long long int id);
  10. int conta(long long int id);
  11.  
  12. void aggiungi(long long int id) {
  13.     libri[id]++;
  14. }
  15.  
  16. void togli(long long int id) {
  17.     if(libri[id] > 0){
  18.         libri[id]--;
  19.         if(libri[id] == 0){
  20.             libri.erase(id);
  21.         }
  22.     }
  23. }
  24.  
  25. int conta(long long int id) {
  26.     return libri[id];
  27. }
  28.  
  29.  
  30. int main() {
  31.     ios::sync_with_stdio(false);
  32.  
  33.     // Uncomment the following lines if you want to read/write from files
  34.     // ifstream cin("input.txt");
  35.     // ofstream cout("output.txt");
  36.  
  37.     int Q;
  38.     cin >> Q;
  39.  
  40.     for(int i = 0; i < Q; i++){
  41.         char t;
  42.         long long int id;
  43.         cin >> t >> id;
  44.  
  45.         if(t == 'a') {
  46.             aggiungi(id);
  47.         } else if (t == 't') {
  48.             togli(id);
  49.         } else if (t == 'c') {
  50.             cout << conta(id) << '\n';
  51.         }
  52.     }
  53.  
  54.     return 0;
  55. }
  56.  
Success #stdin #stdout 0.01s 5288KB
comments (?)
stdin
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5
a 5
c 7
a 10
a 5
c 5
stdout
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0
2
https://ideone.com/8TLA4p
language:
C++ (gcc 8.3)
created:
5 days ago
visibility:
public

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