WhizRx interview questions

The hiring process consists of 4 rounds. Written, Coding, Technical and HR. Written round had 20 basic questions on oops, datastructures and os. It was simple. Coding round had 3 questions. 1)finding the longest palindrome in a string 2) sorting 0's 1's and 2's in a string. 3) implement stack using queues. Then in the technical round they tested the OS ,OOPS and Data Structures Skills. Finally HR round they asked about the projects I have done so far.