Giving back here. You can search all questions with FB recently asked. I dont think i need answer any of the followups here since the questions are textbook leetcode.

PS:

1. Find the minimum turns to open a lock with 4 rings. Lock opens at 0,0,0,0. Lock can turn any direction.
2. Find the best location in a 2d grid of 0,1 so that it is at most optimal distance to all 1s

Onsite:

1. Design dropbox
2. Behavioral - ....
3. Coding 1) buildings-with-an-ocean-view/ 2) minimum-remove-to-make-valid-parentheses/
4. Coding 1) diagonal-traverse/ matrix with slight variation 2) implement lru-cache

REJECT.- coding. seems they need you to write code in first go. I did not even ask hints still the interviewer kept nudging. Horrible experience.