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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. 	int countOne=0;
  8. 	if(arr[0]==1)countOne++;
  9.  
  10. 	for(int i=1;i<n;i++){
  11. 		int goodPair=0;
  12. 		if(arr[i]==1){
  13. 			goodPair = i;
  14. 			countOne++;
  15. 		}
  16. 		else{
  17. 			goodPair = countOne;
  18. 		}
  19. 		ans += goodPair;
  20. 	}
  21. 	return ans;
  22. }
  23.  
  24. int main() {
  25.     int n;
  26.     cin>>n;
  27.     int arr[n];
  28.     for(int i=0;i<n;i++){
  29.     	cin>>arr[i];
  30.     }
  31.  
  32. 	cout<<orSumOfPairs(arr,n);
  33.  
  34.     return 0;
  35. }
  36.  
Success #stdin #stdout 0.01s 5280KB
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stdin
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8
0 1 1 0 0 0 1 1
stdout
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22
https://ideone.com/A1u3hO
language:
C++ (gcc 8.3)
created:
8 days ago
visibility:
public

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