Faces in the Crowd
A medium Python mock interview question on DataDriven, with an AI interviewer who asks follow-up questions and a hire or no-hire decision at the end.
- 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. 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 and run your Python against test cases
- Answer the interviewer's follow-up questions, then get a hire or no-hire decision