Reference: https://youtu.be/UY1lQa9G7RM

1. Clearly communicate your thinking process
2. Don't be silent and solve the problem
3. Don't be afraid of asking for a hint but don't overdo asking for a hint
4. Be honest, if you have seen a problem, it's better to tell them that you've seen it.
5. Learn how to execute under stress.
6. It's okay that syntax isn't clean but don't write a messy and unreadable code.

Basic Algorithm

DFS & BFS