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Dec 6th, 2016
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  1. #include <iostream>
  2. #include <cstdio>
  3. using namespace std;
  4.  
  5. int n, x, a[100100], cnt[100100];
  6. long long ans;
  7.  
  8. int main(){
  9. // freopen("input.txt", "r", stdin);
  10. scanf("%d%d", &n, &x);
  11. for(int i = 0; i < n; ++i){
  12. scanf("%d", &a[i]);
  13. long long cur = a[i] ^ x;
  14. if(cur <= 100000)
  15. ans += cnt[cur];
  16. cnt[a[i]]++;
  17. }
  18. cout << ans << endl;
  19. return 0;
  20. }
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