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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main()
  5. {
  6.  
  7.     int n, i, x, y, ans = 0;
  8.  
  9.     cin >> n;
  10.     map<int, int> mm;
  11.     vector<int> a(n, 0);
  12.  
  13.     for (i = 0; i < n; i++)
  14.     {
  15.         cin >> a[i];
  16.         mm[a[i]]++;
  17.     }
  18.     for (auto p : mm)
  19.     {
  20.         y = p.second;
  21.  
  22.         ans += (y / 2);
  23.     }
  24.  
  25.     cout << ans << endl;
  26. }
Success #stdin #stdout 0.01s 5540KB
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https://ideone.com/6rHa2M
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
public

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