Amazon Developer interview questions

I got a call through my college's career site. Initially there was one screening round followed by 3 other rounds. All were 1:1's. Questions were standard ones, mostly to write code/pseudo-code rather than answer some bizarre questions based on useless language features. My first three interviewers were helpful/friendly except for one guy.

I had two phone interviews at amazon the passed both and waiting for the third one. The first interview was so short. it took about 20 minutes the interviewer asked general data structures question and questions related to web development. The second interview was long and took about an hour. the interviewer asked about data structures as well and some data base and memory related questions/