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  1. #include<bits/stdc++.h>
  2. #define nn 100010
  3. #define ll long long int
  4. #define mp make_pair
  5. #define pb push_back
  6. #define mod 1000000007
  7.  
  8. using namespace std;
  9.  
  10. int b[2*nn],c[2*nn];
  11.  
  12. int main()
  13. {
  14.     ios_base::sync_with_stdio(0);
  15.     cin.tie(0);
  16.     cout.tie(0);
  17.     int n,x;
  18.     cin>>n>>x;
  19.     int tmp;
  20.     for(int i=0;i<n;i++)
  21.     {
  22.         cin>>tmp;
  23.         c[i]=tmp;
  24.         b[tmp]++;
  25.     }
  26.     ll ans=0;
  27.     for(int i=0;i<n;i++)
  28.     {
  29.         ans+=(b[c[i]^x]);
  30.     }
  31.     if(x==0)
  32.         ans-=n;
  33.     ans/=2;
  34.     cout<<ans<<endl;
  35.     return 0;
  36. }
  37.  
Success #stdin #stdout 0s 5024KB
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https://ideone.com/mFOahw
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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