The Cycle Detector
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
Given a list where each index i has next_pointers[i] = next index (or -1 for tail), return True if starting from any index leads to a cycle. Actually: follow starting from index 0 and detect whether any index is revisited before hitting -1 or out-of-range.
Summary
Follow the chain long enough and you might end up where you started.
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