The Level Summer
A medium Python mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- Python
- Difficulty
- medium
- Seniority
- L3
Interview Prompt
You're rolling a metric up a category tree whose nodes each carry an integer `val` and a list of `children` nodes, where that list may be empty. Return a list whose entry at index i is the combined `val` of every node at depth i, counting the root as depth 0 so that even a leaf still contributes to the total at its own depth.
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 your python solution with real code execution
- Get instant feedback and a hire/no-hire decision