Amazon Software Development Engineer, interview questions

I posted my resume on Monster and got a recruiter email to schedule interview within a week. The interviewer was some Indian guy and the interview was completely technical in nature. There were no formal introductions and I was required to have pen and paper to code some questions. Overall difficult interview but the interviewer was very helpful and encouraging. I am supposed to have another telephonic next week.

I applied online and received their invitation of a phone interview 1 month later. Scheduled a phone interview, not fully prepared, the interviewer was nice, but difficult