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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. const long long MaxN = 5e5 + 5;
  4. long long n,a[MaxN],cnt[35];
  5. void input()
  6. {
  7.     cin >> n;
  8.     for (long long i=1; i<=n; i++)
  9.     {
  10.         cin >> a[i];
  11.     }
  12. }
  13. void solve()
  14. {
  15.     sort(a+1,a+n+1);
  16.     long long ans=0, dem=0;
  17.     for (long long i=1; i<=n; i++)
  18.     {
  19.         ans+=dem;
  20.         if(a[i]==0)
  21.         {
  22.             dem++;
  23.             ans++;
  24.             continue;
  25.         }
  26.         long long mx=63-__builtin_clzll(a[i]);
  27.         for (long long j=0; j<mx; j++)
  28.         {
  29.             if(((a[i]>>j)&1)==1)
  30.             {
  31.                 ans+=cnt[j];
  32.             }
  33.         }
  34.         cnt[mx]++;
  35.     }
  36.     cout << ans;
  37. }
  38. int main()
  39. {
  40.     ios_base::sync_with_stdio(0);
  41.     cin.tie(0);
  42.     input();
  43.     solve();
  44. }
  45.  
  46.  
Success #stdin #stdout 0.01s 5296KB
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https://ideone.com/g18QLD
language:
C++14 (gcc 8.3)
created:
4 days ago
visibility:
public

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