The interview was of 1 hour. The interviewer was very polite. Below things were asked:

1. https://leetcode.com/problems/min-stack/ [Easy]
2. https://leetcode.com/problems/binary-tree-right-side-view/ [Medium] [He asked me to print left view]
3. Immutable classes -> how to make a class immutable -> WHat to do if we want to use it as a key in HashMap
4. HashMap vs HashTable
5. Design Pattern: any one
   Hope it helps :)
   Please upvote if you find it helpful