Meta Research Scientist interview questions

Complete full interview loop featuring standard five comprehensive interviews: two system design sessions focusing on architecture and scalability, two LeetCode coding challenges testing algorithmic skills, and one behavioral interview assessing cultural fit and leadership experience.

Did not pass the first round, two coding problems, easy and medium. Solved the first one and waste some time discussing with interviewer about the method for second one. Finally I use my method, the interviewed said he got it but still did not pass it.