Given n doors and n persons. The doors are numbered 1 to n and persons are given id’s numbered 1 to n. Each door can have only 2 status open and closed. Initially all the doors have status closed. Find the final status of all the doors if a person changes the current status of all the doors, i.e. if status open then change to status closed and vice versa, for which he is authorized. A person with id ‘i’ is authorized to change the status of door numbered ‘j’ if ‘j’ is a multiple of ‘i’.

it was ok don't remember it now.it was long time ago.They made us wait for necessary reason.The office was poorly built and the whole place was chaotic.The team lead didnt have proper knowledge of basic Questions like how to find factorial or reversing a palindrome.