Failing test cases

#1
#2

Check the sample output and match with your output.
Sample Output

11, 21, 31, 41, 42, 43, 44, 34, 24, 14, 13, 12, 22, 32, 33, 23, END

There must be a whitespace after every comma

#3

still 1 test case failing

#4

Increase the size of your 2d and then check.
You can verify your approach with this https://ide.codingblocks.com/s/271121