In early 2014, a recruiter contacted me.

I was set up with an engineer for a phone interview. The initial questions focused on my resume, covering simple details about projects I had worked on and my prior experience.

Following that, I was asked two technical questions:

• One about recursion.
• One about trees.

I fully solved and optimized the tree problem, but I struggled somewhat with the recursive problem.

Overall, the interview wasn't too difficult, but ensure you prepare thoroughly before going in!

A recursive problem involving how many combinations you can make out of a set of numbers.

Know your data structures; the problem used both hash tables and lists.