Error in my code of max xor pair using tries

can u please tell me what is the problem in my code.

@D19APPPP0016 it seems that you forgot to save your code please save it, then provide me the link

please recheck it now

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.