Faces in the Crowd
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 are replaying a site's visit log one day at a time, where each entry in `daily_visitors` is that day's list of visitor names and a name can repeat within a day. For each day, report how many people showed up who had never appeared on any earlier day.
Summary
New arrivals keep showing up. Count the ones you have not seen yet.
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