Meta Research Scientist interview questions

The interviewer directly jumped into code questions without many questions about my background. First one is a easy leetcode question, second one is a medium leetcode questions. Each session is 45 minutes.

It consisted of about five rounds. Two rounds of general coding. Then I would have two rounds of machine learning coding, and maybe an onsite interview. In the first round of general coding, I have failed and have no idea about the next steps.