20 questions on MIIS, an old programming language (they will teach you rules and then ask questions based on these rules)
4Q Leetcode Section
Leetcode Questions:
Valid Parenthesis (20), but input can contain alphanumeric characters as well
Well-Ordered Number: List all numbers with d or less digits where the number's digits strictly increase
Palindromic Substrings (647), but printing all palindromic substrings of length >= 3
Word Ladder (127), but path doesn't have to be minimized and without a dictionary of valid words (i.e. any combination of characters can be considered, even if it isn't an actual word)