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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define el "\n"
  4. #define ll long long
  5. #define ull unsigned long long
  6. #define se second
  7. #define fi first
  8. #define be begin()
  9. #define en end()
  10. #define Faster cin.tie(0); cout.tie(0); ios_base::sync_with_stdio(0);
  11.  
  12. int main()
  13. {
  14.     Faster;
  15.     int n; cin >> n;
  16.     int a[n];
  17.     int dem = 0;
  18.     for(auto &x : a) cin >> x;
  19.     for(int i = 0; i < n - 1; i++)
  20.     {
  21.         for(int j = i + 1; j < n; j++)
  22.         {
  23.             if(a[i] > 2 * a[j]) dem++;
  24.         }
  25.     }
  26.     cout << dem;
  27.     return 0;
  28. }
  29.  
Success #stdin #stdout 0s 5284KB
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stdin
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stdout
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https://ideone.com/mgO96L
language:
C++14 (gcc 8.3)
created:
9 days ago
visibility:
public

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