Tree find sum at level K doubt

#1

sir all my test cases does not passes . why?

#2

just add one condition that
if (root==NULL) return 0;

after this your code will pass all testcases

Modified Code

#3

@udaycodingblocks
kindly give your feedback now
if you have further doubts feel free to ask

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.