I did not understand what are we doing and why are we doing this

#1

Please expain the question and how to sort vector as per mapping.Please elaborate

#2

see this video

#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.