Amazon Software Engineer interview questions

I was in one room for 6 hours and had 5 1 on 1 interviews. The recruiter changed the interview dates and sent me to a building that was not on their directory. Thanks to the mix-up I was late, I'm sure this was a mark against me. The five people who interviewed me were nice enough. I have a feeling they weren't really interested in interviewing me as they all seemed kind of checked out throughout the whole process. Lots of brain teasers. Lots of questions on Sorting and Hashing. QuckSorts and HeapSorts. I got the feeling that my answers were correct and good enough but they had already decided on their candidate. The impression I left was not favorable due to the issues getting to the interview and the overall atmosphere- lots of for-show security around the buildings, high on image, low on substance. Final impressions: everyone I spoke with was very smart and very nice but at the end of the day they seemed less than the sum of their parts which is unfortunate- I can envision each one of them doing something more fulfilling.

Got a email regarding phone interview. It was easy.They asked about OOPS Concept, A sorting Algorithm , Its complexity and a design Question.