Amazon Software Development Engineer interview questions

Applied online. Received an email to schedule for the phone interviews. Had two phone interviews and one onsite interview. I am still waiting to hear from the company. The interview primarily consisted of questions related to recursion/dynamic programming/data structures. Each problem was asked to be coded in the white board. Knowledge of Unix/Perl was a plus.

I received my call for employment opportunity with Amazon and within week i had my first round. The interview was straight forward, with questions around Algorithms/Data Structures and basic bit operation. Really simple. Questions were. 1. Given an array with n integers from 1 to n-1, one number is a duplicate, find the duplicate number. 2. given 8-bits give range of signed and unsigned integer values possible. and some other similar questions. Was later asked to submit a coding question, implemented in any OO language suited. The question was to design a deck of cards, with shuffle and deal a card functions to be necessarily included. Now i'm awaiting my second round to be held this week.