Full Circle
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
A forwarding table is stored as a flat array `next_indices`, where each slot holds the index it forwards to next, or -1 to mark the end of a chain. Starting from slot 0 and following the pointers, return the index of the first slot the walk reaches twice, or -1 if it ends first. A pointer of -1, or one that falls outside the array, ends the walk rather than closing a loop.
Summary
Follow the chain long enough and it might loop back.
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