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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	// your code goes here
  6. 	int n;
  7. 	cin>>n;
  8. 	vector<int>arr(n);
  9. 	for(int i=0;i<n;i++){
  10. 		cin>>arr[i];
  11. 	}
  12. 	sort(arr.begin(),arr.end());
  13. 	int k;
  14. 	cin>>k;
  15. 	int count=0;
  16. 	for(int i=0;i<n;i++){
  17. 		for(int j=n-1;j>=i+1;j--){
  18. 			int sum=arr[i]+arr[j];
  19. 			if(sum<=k){
  20. 				count=count+j-i;
  21. 				break;
  22.  
  23. 			}
  24.  
  25. 		}
  26. 	}
  27. 	cout<<count;
  28. 	return 0;
  29. }
Success #stdin #stdout 0.01s 5288KB
comments (?)
stdin 
4
1 2 3 4
3
stdout 
1
https://ideone.com/ZDPpfM
language:
C++ (gcc 8.3)
created:
5 days ago
visibility:
public

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