Amazon Software Developer interview questions

Applied through their web interface and received a communication from HR. Set up a time to talk where I had to be at a computer. They set up a whiteboard on which I was to post answers to their questions. Was completely unprepared; stammered, and clearly failed. The interviewer was not even paying attention, so it felt like a passthrough where the stakes were low and I just had to get those questions right. They weren't interested in anything I had to say about my experience.