Welcome! It's time to learn how HackerRank works and solve some basic problems.

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This contest will be left open indefinitely for practice purposes. The problems are from a set created last year by Zeki Gurbuz and Steven Cheng themed after the infamous Koozebanian Phoob! After working on these problems, you should understand the basic structure of HackerRank and feel more confident about working in the environment. You'll also learn some basic techniques such as string manipulation.


Glory, Honor, and Praise :D


  • The creator of this contest is solely responsible for setting and communicating the eligibility requirements associated with prizes awarded to participants, as well as for procurement and distribution of all prizes. The contest creator holds HackerRank harmless from and against any and all claims, losses, damages, costs, awards, settlements, orders, or fines.
  • Code directly from our platform, which supports over 30 languages. Learn more here.
  • Practice honestly; this is an opportunity for you to learn!
  • If you need help, feel free to ask!!! Any advanced person is open to helping :)
  • Keep the 212 spirit alive!


  • Each problem is worth 1 point, with a maximum score being equal to 9 points.
  • Ties will be broken by time (shortest time to submit the last problem solved correctly).

Sign up for CWHS-0 now.

Not a genuine coding contest?