Meta Software Engineer interview questions

E6 interview. 1 behavioral round asking about past projects, mentoring teammates, learning from mistakes. 2 coding rounds. All leetcode tagged to Facebook, 2 medium difficulty questions each round. 2 system design rounds. One was focused on designing an API and one on a scalable system, similar to a Grokking the System Design Interview question

The interview was the standard "Coding Gameshow" where you can win a job. The interviewer asked me two technical questions. I nailed the first one. The second one, I struggled for a 3-4 minutes (asking questions all along the way). I finally arrived at a linear solution to the problem. The interviewer was not familiar with my approach and told me I was wrong. I suggested it should work but then proceeded to work out the version of the solution he wanted. Unfortunately, I ran out of time. Interviewer was great to speak with, but ultimately was unfamiliar with all the solutions to the problem he asked.