Amazon Software Development Engineer interview questions

Had 2 technical phone screen, focusing ONLY on algorithms and data structures. 1st Phone interview questions: Print first 'N' prime numbers Given key-value pairs, sum up the values of same keys and save them in a data structure. What if you want to retain the order of keys entered? For ex: if the user enters B-1, A-2, C-3, A-1, B-6 the keys must be saved in teh given order B-7,A-3,C-3 2nd Phone interview: Only 1 question - Given 'n' integers, n being very large, print the numbers in a given range. Ex; print all the numbers between 100 and 200. What data structures to use.

I had 3 in-person interviews, each with a different rep, and one by phone. One of the interviews focused on OO design and DB design. The second focused on Data structures and the third one on simple coding questions and recursion. This was for a fresh-out-of-college software engineer, so the level of difficulty wasn't so high, certainly nowhere near the legendary insane questions Google or MS are known to ask. I did well on those three interviews, but not so well on the phone one (more coding questions). My impression was that each interviewer then casts a vote, since I was given an offer despite my poor performance on the last interview. I wasn't asked to go to Seattle for interviews.