I applied online, and two weeks later I received an email from a recruiter asking me to complete a 90-minute timed online coding exercise from HackerRank. The coding exercise could be started at any time within one week from the day it was sent.

My coding exercise involved developing an online class registration system. I had to implement several related functions, such as adding a class, removing a class, enrolling a student, and removing a student, with specific details provided for each.

I didn't find it very difficult, but it was quite long, so I wasn't able to implement everything. You can compile and run your program directly on the coding exercise page. There are also test cases that show which ones you passed, which ones you got wrong, and what the correct output should have been.

Implement an online class registration system.