The Repeat Visitor
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
- L4
Interview Prompt
You're combing purchase logs for a retail loyalty team, where each record carries a `user` and a `date` string in 'YYYY-MM-DD' format. A user counts as a repeat visitor if two of their purchases fall within `days` of each other on the calendar. Return the IDs of those users.
Summary
Loyal customers come back sooner than expected.
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