Fullstack Developer

You are given a Singly Linked List of integers. You need to reverse the Linked List by changing the links between nodes.

Note :

You do not need to print anything, just return the head of the reversed linked list. 

There are 100 doors in a row, all doors are initially closed. A person walks through all doors multiple times and toggle (if open then close, if close then open) them in the following way: 

In the first walk, the person toggles every door 

In the second walk, the person toggles every second door, i.e., 2^nd, 4^th, 6^th, 8^th, … 

In the third walk, the person toggles every third door, i.e. 3^rd, 6^th, 9^th, … 

Likewise,

In the 100^th walk, the person toggles the 100^th door. 

Which doors are open in the end? 

Tell me about yourself. ...
Why do you want to work for our company? ...
What are your greatest strengths and weaknesses? ...
Why are you looking for a change? ...
Tell me about the gap in your resume. ...
How would you rate yourself on a scale of 1 to 10?