It was a one-day recruitment. You arrive in the morning and first take a page exam with LeetCode questions (as described here). Afterwards, there will be an interview with a recruiter (random questions from LeetCode).

Here are 3 questions:

1. Input: A string and a list of whitelist words. You need to filter words that occur more than once, ignoring words from the whitelist.

2. The same question as 1, but you are given an API that returns True or False instead of the whitelist.

3. LRU question from LeetCode.