My onsite interview was 5 hours of pretty much back-to-back interviews. Each interviewer had me for about 45 minutes at a time. It seemed they didn't have too much to ask me, so most of the day, I was asking most of the questions.

The first section was a 2-hour Android coding challenge. I was asked to build an Android app that made use of ListViews and Coursera's open Catalog API. The task was to display a list of universities in Coursera's Catalog, and then, upon a click, display a list of courses offered by that university.

Given a pre-order and an in-order traversal, write a function to generate the post-order traversal.

Write a method to combine the elements of N sorted arrays into one large sorted array, both recursively and iteratively.