fork download
copy 
  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. int getCount(vector<int>& arr,int k){
  4. 	int n=arr.size();
  5. 	int count=0;
  6. 	for(int i=0,j=n-1;i<n;i++){
  7. 		int sum=arr[i]+arr[j];
  8. 		while(sum>k && i!=j){
  9. 			j--;
  10. 			sum=arr[i]+arr[j];
  11. 		}
  12. 		if(i==j){
  13. 			break;
  14. 		}
  15. 		count=count+(j-i);
  16. 	}
  17. 	return count;
  18. }
  19.  
  20. int main() {
  21. 	// your code goes here
  22. 	int n;
  23. 	cin>>n;
  24. 	vector<int>arr(n);
  25. 	for(int i=0;i<n;i++){
  26. 		cin>>arr[i];
  27. 	}
  28. 	sort(arr.begin(),arr.end());
  29. 	int L;
  30. 	cin>>L;
  31. 	int R;
  32. 	cin>>R;
  33. 	int result1=getCount(arr,L-1);
  34. 	int result2=getCount(arr,R);
  35. 	cout<<"The sum of pair in the given range is:"<<result2-result1;
  36. 	return 0;
  37. }
Success #stdin #stdout 0s 5320KB
comments (?)
stdin
copy 
7
0 1 2 3 4 5 6 
3
5
stdout
copy 
The sum of pair in the given range is:7
https://ideone.com/JXKPvN
language:
C++ (gcc 8.3)
created:
4 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!