Amazon Software Engineer interview questions

Had 2 phone interviews. I passed the first one so they scheduled the second phone interview, which I did not do well. Perhaps because I this is the first time I do online coding while the interviewer is watching. I jumped on coding too quick before coming up with a clear solution.

Standard technical interview. The interview took a little of an hour. I was asked 1 or 2 questions about my resume, and then was asked technical question. Technical questions include: (1) How I would design a phone book for phone with limited resources, that supported matching while typing. (2) Asked to code an algorithm to find the power set of a set.