Amazon Software Engineer interview questions

I had two phone interviews. Those went really well and the interviewers were pretty friendly. I had a little bit of trouble understanding the second interviewer who had an thick accent. But highly knowledgeable and gave me fun program to solve. After the initials phone screening the recruiters coordinated with me with flight tickets and hotel arrangements in Seattle, Wa. The on site interview was not pleasant for me. The reason for that was I was very tired after a six hours flight cross country. When I reached Seattle, WA I could not sleep that night with a little bit of nerves and expectation. I really wanted the job but after the lunch my interview went into a downward spiral and the last interview I think I totally flunked and wasted the interviewer's time which was the most important as he mentioned he was from outside the group that I was being interviewed for (Or so called Amazon's Bar raiser). Overall people are so friendly and the problems are not difficult. You can solve them with your eyes closed given time and in an relaxed environment. But if you succumb to pressure and easily stressed things can go wrong and will go wrong as I found out.