InterviewBit Problems   MATH_BUG02 : Unsolved

About the MATH_BUG02 : Unsolved category (1)
0 positive or not (4)
TIP A and B are non negative (1)
A and b are positive integers (1)
Remember it given that a<=b (1)
Probably Invalid Test Case (4)
Trying to figure out why my code isn't working (2)
General question - debugging (1)
Finding pairs in O(n) time (1)
Works fine when run as custom input but gives error on submitting for A=1 (1)
I Got double marks (1)
There is a bug in the checker code: A : 1 Your function returned the following : (4)