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The Elevator Trace
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
- junior, mid
Interview Prompt
We need to simulate a sequential traversal of a nested data structure. Given a list of lists, return all elements visited first forward through every inner list left to right, then backward through the same lists right to left. Return the complete traversal sequence as a flat list.
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