Test cases are working but WA in submission

#1

link to code

test cases seems to work

#2

try for input
1
58454721 76837501
you will get 0 as an answer
whereas correct answer will be
92784
Try to do it using binary search, take this for reference

#3

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.