Data Structures & Algorithms: Hash table concepts and implementation, DFS preorder traversal, and Binary Search Tree.

This round went really smoothly. The questions were fairly basic and focused mainly on fundamental concepts.

Spark: Questions about Spark parameters, including what they are and whether I had ever tuned them. They also discussed the concept of shuffle and how to handle a large list using Spark.

Data Structures & Algorithms:

Path Sum Letter Combinations of a Phone Number Word Break

All three were the original LeetCode problems without any modifications.

This round was more of a casual discussion, covering my past experience along with hash table implementation.