Hey guys, I have my onsite-loop interview at Amazon in 10 days. My recruiter told me I have the following 4 rounds.

1. Behavioural Interview with the Manager.
2. Data Structures and Algorithms
3. Problem Solving
4. Logical and Maintenable code

I have an understanding of what is going to be asked in the first and second interview.

Just wondering if anyone know what kind of questions I can expect in Problem solving and Logical and maintainable code rounds and how to prepare for them.

Note: I have already passed my telephonic interview round. ( The question was, given a binary tree root and a node, find the node's siblings - I used BFS and Queue).

TIA.