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The Repeat Visitor
A medium Python interview practice problem on DataDriven. Write and execute real python code with instant grading.
- Domain
- Python
- Difficulty
- medium
- Seniority
- mid, senior
Problem
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.
Practice This Problem
Solve this Python problem with real code execution. DataDriven runs your Python code in a sandboxed Docker environment and grades it instantly.