Amazon Software Development Engineer SDE I interview questions

it consisted of three rounds first was the online assessment that had two coding problems related to array then a technical round based on DSA. LFU cache was asked in the interview along with the implementation.

It was nice. The interviewer was very helpful and friendly while being very technical. The interviewer asked me many questions and I was able to get most of them. But again, I don't know why i don't get selected for interview. I answered all the questions correctly. But still I don't know why i don't get selected.