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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. const long long MaxN = 1e6 + 5;
  4. long long n,a[MaxN];
  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.     long long cnt0=1, cnt1=0, ans=0, sum=0;
  16.     for (long long i=1;i<=n; i++)
  17.     {
  18.         sum^=a[i];
  19.         if(__builtin_popcountll(sum)&1)
  20.         {
  21.             ans+=cnt0;
  22.             cnt1++;
  23.         }
  24.         else
  25.         {
  26.             ans+=cnt1;
  27.             cnt0++;
  28.         }
  29.     }
  30.     cout << ans;
  31.  
  32. }
  33. int main()
  34. {
  35.     ios_base::sync_with_stdio(0);
  36.     cin.tie(0);
  37.     input();
  38.     solve();
  39. }
  40.  
  41.  
Success #stdin #stdout 0.01s 5320KB
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Standard input is empty
stdout
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Standard output is empty
https://ideone.com/I1kTMX
language:
C++14 (gcc 8.3)
created:
4 days ago
visibility:
public

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