Hi I recently went through the FB interview loop and I wanted to give back. Applied through referral around Feb.

Phone Screen 1: https://leetcode.com/problems/regular-expression-matching/

• Had not solved this before, but had seen it. Was quite difficult and needed some hints from the interviewer, but ended up with the corret solution at the end.

Phone Screen 2: https://leetcode.com/problems/permutation-in-string/

• Was able to come up with a working solution.

Virtual Onsite: (not in order)
Coding 1:
Q 1: https://leetcode.com/problems/merge-sorted-array/
Q 2: https://leetcode.com/problems/merge-k-sorted-lists/
- Seen both before and gave optimal solutions and complexities for both.
Coding 2:
Q1: Word Break 2:
- Pretty hard question, this is where I choked and couldn't give a working solution. Ran out of time.
Behavior:
- Standard behavior behavior questions followed by a coding question in last 15m
- Q1: Forgot the question I think it was a LC Easy/Med something given a list of words and target word, return true if all prefixes of target is inside of list. I.e. T: cart L:[c, ca, car] = True
System Design:
- Design privacy for FB posts. Wanted to know about table schema design. And how would a user be able to view another users posts depending on the setting set by the poster.

Thoughts:
Prep: Prepared for about two months did a lot of LC and read Grok the Sys.

• I know for sure it was my choke on Coding 2 that cost me the interview. FB really wants perfect code and fast, most likely I had a 2nd question to answer and couldn't even finish the first. Interviewer was silent the whole time. LC premium high frequency helped a lot. Kind of disappointed, but understandable. Will try again next year.