Four sum problem

#1

ques link:-https://practice.geeksforgeeks.org/problems/find-all-four-sum-numbers/0
my soln.link:-https://ide.codingblocks.com/s/257053
why i m getting wrong answer?

#2

@Sagarjha07
Your logic is wrong sagar,
Lets take a example, if the sum is 5, mp[5] will have only one pair, but 5 could be achieved by multiple ways, i.e 2+3, 1+ 4.