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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
mid, senior

Interview Prompt

Given a list of purchase records, each with a user ID and a date, identify all users who made at least two purchases within a rolling window of N days of each other. Return the list of matching user IDs sorted alphabetically.

How This Interview Works

  1. Read the vague prompt (just like a real interview)
  2. Ask clarifying questions to the AI interviewer
  3. Write your python solution with real code execution
  4. Get instant feedback and a hire/no-hire decision