To my surprise, the interviewer was not able to speak English. I thought ByteDance was an international company. This caught me by surprise.

Also, he was 30 minutes late and stormed in, starting to ask questions with a bad attitude.

1. Introduce myself.
2. Ask how the database engine was implemented.
3. Some knowledge of Hadoop.
4. Coding: Combine 3 sorted arrays into 1 sorted array.
5. Some hard DP coding problem.

1. Introduce myself.
2. Ask how the database engine was implemented.
3. Some knowledge of Hadoop.
4. Coding: Merge 3 sorted arrays into 1 sorted array.
5. Solve some HARD DP coding problems.