Amazon Software Development Engineer SDE I interview questions

Applied online via amazon jobs, got referred by an amazon employee, called by a recruiter couple days later, afterward got an email for an online interview with the team manager, the interviewers were friendly and asked couple questions about leadership principles then had a coding challenge with a discussion about space and time complexities.

30 students were selected for the interview and I was one of them. There were 2 interview rounds and I was rejected after the first one. I explained the approach correctly but made a mistake in one of the question.