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  1. #include <iostream>
  2. using namespace std;
  3. #include <bits/stdc++.h>
  4.  
  5. int main() {
  6. 	// your code goes here
  7.  
  8. 	int arr[]={1,2,3,4,5,6};
  9. 	int n;
  10. 	cin>>n;
  11. 	int k;
  12. 	cin>>k;
  13. 	sort(arr,arr+n);
  14. 	int i=0,j=n-1,sum=0,count=0;
  15. 	for(i=0,j=n-1;i<n && j>=0;i++)
  16. 	 {
  17. 	 	sum=arr[i]+arr[j];
  18. 	 	while(sum>k && i!=j)
  19. 	 	 {
  20. 	 	 	j--;
  21. 	 	 	sum=arr[i]+arr[j];
  22. 	 	 }
  23. 	 	 if(i==j)
  24. 	 	  {
  25. 	 	  	break;
  26. 	 	  }
  27.  
  28. 	 	  count+=(j-i);
  29. 	 }
  30. 	 cout<<count;
  31.  
  32. 	return 0;
  33. }
Success #stdin #stdout 0.01s 5272KB
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https://ideone.com/fanvsc
language:
C++ (gcc 8.3)
created:
13 hours ago
visibility:
public

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