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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4.  
  5. int orSumOfPairs(int arr[] , int n){
  6. 	int ans = 0;
  7.  
  8. 	for(int i=0;i<32;i++){
  9. 		int countOne=0;
  10. 		int mask = (1<<i);
  11. 		if(arr[0] & mask)countOne++;
  12. 		for(int j=1;j<n;j++){
  13. 			int goodPair = 0;
  14. 			if(arr[j] & mask){
  15. 				countOne++;
  16. 				goodPair = j;
  17. 			}
  18. 			else{
  19. 				goodPair = countOne;
  20. 			}
  21. 			ans += (1<<i)*goodPair;
  22. 		}
  23. 	}
  24. 	return ans;
  25. }
  26.  
  27. int main() {
  28.     int n;
  29.     cin>>n;
  30.     int arr[n];
  31.     for(int i=0;i<n;i++){
  32.     	cin>>arr[i];
  33.     }
  34.  
  35. 	cout<<orSumOfPairs(arr,n);
  36.  
  37.     return 0;
  38. }
  39.  
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/tV9tgA
language:
C++ (gcc 8.3)
created:
8 days ago
visibility:
public

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