Good Evening/Afternoon/Morning everyone ( Basically, Salaam Dosto )

I am able to solve only subtask 1 of Max Shift After XOR. I am not able to understand the editorial given out there.

I asked in announcement on codeforces page about hints and approaches but no one replied. So I am writing a blog for help. Any please explain your approach and if you understood the problem please explain that too.

Thank you in Advance and sorry for my poor English.

And Have a nice day

Problem Link : link