InterviewBit Problems   SUBTRACT : Unsolved

About the SUBTRACT : Unsolved category (1)
Python 3 solution using top down design (1)
Where is my code goes wrong? (2)
Wrong Answer in test button but Right answer in custom test (2)
Does not make sense (2)
Seg fault: please help (2)
Differnt onutput on both custom test annd test (3)
Simple C++ with O(n) time complexity and O(1) space (1)
What's the expected memory / time complexity ? ( O(1) / O(n)? (2)
Segmentation fault in test button but right answer in custom input (1)
First value of linked list in test case in swift is wrong (4)
Not able to process input (1)
I am trying to implement this in Java but i dont know what the implementation of (2)
I am getting memory limit exceed, despite using constant memory.. is it due to i (3)