INRIX Software Development interview questions

Applied online where they had a simple programming problem to complete. Got an email from HR about a week and a half later setting up a phone interview with one of the engineers. He asked a few questions about my previous projects and then some more technical questions almost entirely on graphs (I struggled since I had neglected graphs for almost a year from my data structures class). After the phone interview, he gave me a programming problem to submit to him later in the day.