Please help to find the error in my code

Question

Read the first comment in the code to understand the concept of the programm
https://code.sololearn.com/cz2bwMMUBwe7/?ref=app

Answer 1

Yes I tried
But even though I am not able to correct them

Answer 2

The previous is an array
And this question is about matrix

Answer 3

Where is the difference to yor other question?
https://www.sololearn.com/Discuss/2186905/?ref=app