45-50 mins of Online Interview - Coderpad.

First 5 mins: Introduction
40Min: Coding Round
Last 5 Mins: Asking any questions

The interview consist of 2 problems

1. https://leetcode.com/problems/valid-palindrome/

2. Sorted Iterator
   Given N sorted array list, Implement a Data structure with hasNext() and next() in sorted order. 
   e.g.  Input
   list 1 -> 4, 13, 17, 21, 85, 93
   list 2-> 2, 9
   list 3 -> 1, 5, 7, 18, 33

   Output
   next() -> 1
   next() -> 2
   next() -> 4
   next() -> 5
   hasNext() -> true;
   next() -> 7
   next() -> 9
   ....

   next() -> 93
   hasNext() -> false