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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. typedef long long ll;
  4.  
  5. class SinhVien {
  6. private:
  7.     string id, name, id_class, mail;
  8.  
  9. public:
  10.     SinhVien() {}
  11.     string getId() { return id; }
  12.     string getIdClass() { return id_class; }
  13.     friend istream& operator>>(istream& in, SinhVien& sv);
  14.     friend ostream& operator<<(ostream& out, SinhVien sv);
  15. };
  16.  
  17. bool cmp(SinhVien a, SinhVien b) {
  18.     if (a.getIdClass() == b.getIdClass()) {
  19.         return a.getId() < b.getId();
  20.     }
  21.     return a.getIdClass() < b.getIdClass();
  22. }
  23.  
  24. istream& operator>>(istream& in, SinhVien& sv) {
  25.     getline(in, sv.id);
  26.     getline(in, sv.name);
  27.     getline(in, sv.id_class);
  28.     getline(in, sv.mail);
  29.     return in;
  30. }
  31.  
  32. ostream& operator<<(ostream& out, SinhVien sv) {
  33.     out << sv.id << " " << sv.name << " " << sv.id_class << " " << sv.mail;
  34.     return out;
  35. }
  36.  
  37. int main() {
  38.     cin.tie(NULL);
  39.     cout.tie(NULL);
  40.     ios_base::sync_with_stdio(false);
  41.  
  42.     int N;
  43.     cin >> N;
  44.     cin.ignore();
  45.     SinhVien ds[N];
  46.  
  47.     for (int i = 0; i < N; i++) {
  48.         cin >> ds[i];
  49.     }
  50.  
  51.     sort(ds, ds + N, cmp);
  52.  
  53.     for (int i = 0; i < N; i++) {
  54.         cout << ds[i] << endl;
  55.     }
  56.  
  57.     return 0;
  58. }
  59.  
Success #stdin #stdout 0.02s 5288KB
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https://ideone.com/trmL2a
language:
C++ (gcc 8.3)
created:
3 days ago
visibility:
public

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