Tripadvisor Software Engineer interview questions

My first interview came on campus 1 day after TripAdvisor visited for a career fair. That interview was technical and 30 - 45 minutes long. There was some time to ask questions about the company at the end. After this, I was given a coding challenge that was supposed to take 2 hours (but you'd better spend more than 2 hours on it, because there is a job on the line). Finally, the onsite interview happened. 2 technical, 1 lunch and 1 non technical interview with a senior engineering manager

The interviewer didn't seem very interested or enthusiastic, but that's not too surprising if it wasn't his first phone interview of the day. I was asked just one technical question. Using codeshare, he went through the problem with me, answering questions and giving some feedback, but not much. At the end, he asked some standard questions about my solution, including run time, overhead, and ideas to improve.