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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int arr[]= {10,5,2,7,1,9};
  6. 	int n=sizeof(arr)/sizeof(arr[0]);
  7. 	int k=15;
  8. 	int pairs=0;
  9. 	vector<int> prefixXor(n);
  10. 	prefixXor[0]=arr[0];
  11. 	for(int i=1;i<n;i++)
  12. 		prefixXor[i]=prefixXor[i-1]^arr[i];
  13. 	unordered_map<int, int> mp;
  14. 	mp[0]=1;
  15. 	for(int j=0;j<n;j++){
  16. 		int toFind=prefixXor[j]^k;	
  17. 		pairs+=mp[toFind];
  18. 		mp[prefixXor[j]]++;
  19. 	}
  20. 	cout<<pairs;
  21. 	return 0;
  22. }
  23.  
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/NA3G90
language:
C++ (gcc 8.3)
created:
2 hours ago
visibility:
public

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