Amazon Software Development Engineer interview questions

Onsite. You need a little luck to get a nice/good interviewer. In one round, the interviewer was very vague, did not provide input/output. When I asked him to clarify the question, he stayed silent...?!? When I made up the input, it didn't match what he had in hand. He kept quizzing me "why do you choose this input?", and never gave me the input throughout the entire interview. My input should work, it was just not what he was looking for. The problem was not hard. But since I didn't have the correct input, I didn't have the implementation he wanted to see. In another round, the interviewer gave me <25m for the coding part, but keep expanding the question. I couldn't finish all cases within the time limit. In 2 other rounds with nicer interviewers, they communicated well with me and I did ok. Rejected in the end.

Very good process , takes care of the candidate's availability, very clear on the question they ask . Very details tech question , will have to write code in multiple rounds . DS/Algo /PS important