InterviewBit Problems   Sub Matrices with sum Zero : Unsolved

About the Sub Matrices with sum Zero : Unsolved category (1)
Fixing columns is not working (3)
Please mention required time complexity in the question! (1)
Didn't get why to use map at all. Can some explain with the help of an example. Please TIA (1)
Not a 2D matrix in input (2)
Giving Segmentation fault (2)
Perfect application of max sum rectangle in 2D matrix (1)
Is there any online video to describe the approach used? (2)
Good question, worth more points (3)
O(n^4) solution is accepted (1)
This question is rigged (2)
Sample test case wrong for sub matrices with sum zero (1)