Amazon Software Developer interview questions

There are several questions like symmetric trees, 2-sum question. The answers to these questions can be easily found on the internet. But it is a little difficult to do the coding in 45 minutes.

Had four telephonic round, most of the questions were on algorithms and some question on c++ basics. Every round went well but the interviewer was expecting answers in the perspective of Java and object oriented. I am a c developer. so dint got selected