1. Correctness: Your solution correctly identifies the celebrity based on the given conditions. Well done!
2. Time Complexity: Your solution has the optimal time complexity of O(n^2), which is expected for this problem.
3. Space Complexity: Your solution uses O(n) space, which is efficient and matches the reference solution.
4. Code Quality: The code is clean, readable, and follows good practices. The use of a helper function knows is a good approach.
5. Efficiency: The solution is efficient, but you could consider mentioning that the problem can also be solved with a two-pass approach (first pass to find a potential candidate, second pass to verify), which might be more efficient in some cases.

Areas for Improvement:

• Remove unrelated files from the submission to avoid confusion.
• Consider adding comments to explain the logic, especially for the in-degree calculations, to make the code more understandable for others.