InterviewBit Problems   N max pair combinations : Unsolved

About the N max pair combinations : Unsolved category (1)
Editorial soln with comments C++. This sum is hard. Def should be > 200 (2)
IB doesn't allow to use unordered_set use set instead (2)
Does it really involves heap (3)
Java Solution O(n logn) (1)
I am getting wrong anwser can someone tell me what is wrong in my code (1)
Can't find the issue in this Java program (2)
Can someone tell me what's wrong in my java code (1)
Test cases are incorrect (2)
Hint for anyone getting partial points (1)
Poor tests, the question expect an answer sorted in a particular way (2)
What is wrong in this program (1)
This problem should be definitely more than 400 score (1)
This problem should be of more score (1)
C# compilation failing due to unresolved references (1)
No space allocation, yet gives MLE (2)
Stop spending time on this question (6)
Proof of correctness (4)
Strangge Error while submitting (1)