Kindly check this code and modify it . It is showing failed test cases
logic and approach both are correct
only there is one silly mistake
first you have to take m and n
you reverse the order
Modified Code
if you have more doubts regarding this feel free to ask
i hope this helps
if yes hit a like 
: and don’t forgot to mark doubt as resolved 
I hope I’ve cleared your doubt. I ask you to please rate your experience here
Your feedback is very important. It helps us improve our platform and hence provide you
the learning experience you deserve.
On the off chance, you still have some questions or not find the answers satisfactory, you may reopen
the doubt.