I need help with this matrix problem

Question

https://code.sololearn.com/c45xpjMnKk5r/?ref=app

I get an out of bounds error when compiling.
I want the output to be as follows.
1 2 3
4
5 6 7

Answer 1

This creates something like what you want:
https://code.sololearn.com/clH8sdfSV5m8

Answer 2

Either rows and columns should be the same length.

Btw. Learn about nested loops.