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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n;
  6.     cin>>n;
  7.     int k;
  8.     cin>>k;
  9.     int arr[n];
  10.     for(int i=0;i<n;i++){
  11.         cin>>arr[i];
  12.     }
  13.     int ans=0;
  14. 	int start=0, end=n-1;
  15. 	while(start < end){
  16. 		int sum = arr[start] + arr[end];
  17. 		if(sum <= k)
  18. 			start++;
  19. 		else{
  20. 			ans=ans+end-start;
  21. 			end--;
  22. 		}
  23. 	}
  24. 	cout<<ans;
  25. 	return 0;
  26. }
Success #stdin #stdout 0.01s 5312KB
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https://ideone.com/qCsi6T
language:
C++ (gcc 8.3)
created:
10 hours ago
visibility:
public

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