Last month HackerRank hosted the Evernote Coding Challenge. I participated and solved the first two tests, but failed on the next two. My rank was 66th. The price was a three-month Evernote Premium code.

Solving challenges on HackerRank is fun. They are grouped in domains like Algorithms, Functional Programming and Artificial Intelligence. You can submit your code in 30 different languages including C#. I’m hooked.

Signup is free and every developer loves to solve puzzles.