Amazon Software Engineer Internship interview questions

3 rounds. First was debugging and aptitude. Second was coding two questions. Third is phone interview. The first two rounds were fairly easy. I did not get selected for the third round though.

Applied online at Amazon.jobs. First round was an online test - code debugging and general aptitude. The second round was again an online test - coding round ( 2 programs in 70 minutes). Mostly tested in data structures, esp trees and string related programs implementing hashmap, arraylist. The third round was a technical interview, where the interviewer asks you to code a program and few technical questions on design patterns and data structures.