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  1. #include<bits/stdc++.h>
  2.  
  3. #pragma GCC optimize("O2")
  4. #pragma GCC optimize("O3")
  5. #pragma GCC optimize("Ofast")
  6.  
  7. #define pii pair<int,int>
  8. #define ii int,int
  9. #define fi first
  10. #define se second
  11. #define pb push_back
  12. #define lb lower_bound
  13. #define ub upper_bound
  14. #define umap unordered_map
  15. #define BIT(mask, i) ((mask >> i)&1)
  16. #define ALL(c) c.begin(), c.end()
  17.  
  18. using namespace std;
  19.  
  20. mt19937 rd(chrono::high_resolution_clock::now().time_since_epoch().count());
  21. int rand(int l, int r){
  22.     return  l + rd()*rd()%(r-l+1);
  23. }
  24.  
  25. const int N = 1e6+7;
  26. const int M = 1e3+3;
  27. const int MOD = 1e9+7;
  28. const int inf = 3e18;
  29.  
  30. int n;
  31.  
  32. signed main(){
  33.     ios_base::sync_with_stdio(0);
  34.     cin.tie(0);
  35.     cout.tie(0);
  36.     cin >> n;
  37.     map<long long, int> mp;
  38.  
  39.     for(int i = 1; i <= n; i++){
  40.         long long x;
  41.         cin >> x;
  42.         mp[x]++;
  43.     }   // đếm được mỗi phần tử xuất hiện bao nhiêu lần rồi
  44.     // -> in ra map -> thỏa mãn đề bài
  45.     for(auto i : mp){
  46.         cout << i.first << ' ' << i.second << '\n';
  47.     }
  48. }
  49.  
Success #stdin #stdout 0.01s 5284KB
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https://ideone.com/JbnzhI
language:
C++14 (gcc 8.3)
created:
8 hours ago
visibility:
public

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