Amazon Quality Assurance Engineer interview questions

Interview process was smooth and good. It was as expected high Standards. Questions Level as expected was very high but if basics are clear, it wont take much time to solve it. Its mostly the performance of the code written matters. The best code you write, the better it is. (VERY VERY IMPORTANT FOR AMAZON) Only one review that I will like to give about the interview process is that, HR people should give a proper explanation (If Candidate asks for it) that what went wrong and why he was not offered because in my case, I gave a very good interview and was confident to get selected but that was not the case and if the HR people let the candidate know what went wrong, probably the candidate can work on the week areas and that will help in their own growth and will have high regards about the company (AMAZON) as well to help them grow.