The Level Summer
A medium Python mock interview question on DataDriven, with an AI interviewer who asks follow-up questions and a hire or no-hire decision at the end.
- Domain
- Python
- Difficulty
- medium
- Seniority
- L3
Interview Prompt
Return the combined `val` of every node at each depth of our category tree, one entry per depth, where every node carries an integer `val` and a list of `children` that may be empty.
Summary
Every tier of the hierarchy keeps its own total.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write and run your Python against test cases
- Answer the interviewer's follow-up questions, then get a hire or no-hire decision