Airbnb Software Engineer interview questions

Contacted by a recruiter, talked with her about my past experience and then she set up a phone screen. The phone screen was not to hard, basic recursion question. After that there were two Skype interviews that both involved implementing a graph to find the best path based upon some criteria. Both were only 45 mins so you I barley even worked up a solution by the the end of the interview. Overall the experience was not that bad, but it was difficult.