Kth root problem failing last test case

I’m failing last test case in this problem, please help me out
here is my code link https://ide.codingblocks.com/s/296664

@sourav_817 check for the cases where exact root is given, for eg 64, 2 the answer is coming out to be 7 which is wrong.

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.