question: https://codezen.codingninjas.com/practice/470/20/pair-sum-in-array
all test cases are not passing
https://ideone.com/LHeZfj
Practicising hash maps
on codezen it has passed all testcase
please check again
if you have more doubts regarding this feel free to ask
i hope this helps
if yes hit a like and don’t forgot to mark doubt as resolved 
I hope I’ve cleared your doubt. I ask you to please rate your experience here
Your feedback is very important. It helps us improve our platform and hence provide you
the learning experience you deserve.
On the off chance, you still have some questions or not find the answers satisfactory, you may reopen
the doubt.