Amazon Software Development Engineer I (SDE I) interview questions

This was a new grad role. Had a recruiter reach out to a job application from several months ago requesting an expedited process to be done within a week. I accepted although the minimal preparatory period contributed to the negative outcome. Process began with an OA with two medium-hards + a behavioural test. Passed with a perfect score. Proceeded to a three-round onsite where I do well in the first two rounds but bombed the third as I was asked a challenging LC hard (LFU Cache) I had not seen before with the interviewer demanding a perfect optimal solution in 30 minutes. That the interviewer was cold and terse throughout did not help. It's frustrating that so much of your career in this field is just RNG. Many colleagues interviewing for the same role got mediums and easies and hence offers. I am further punished with a year-long cooldown period.