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A medium Python interview practice problem on DataDriven. Write and execute real python code with instant grading.

Domain

Python

Difficulty

medium

Seniority

L4

Problem

You're auditing login records from a retention dashboard, where each entry in `activities` carries a `user_id` and a `date` string in 'YYYY-MM-DD' form, and a user can appear more than once on the same day. Return the `user_id`s who were active across at least `min_streak` (default 3) back-to-back calendar days, treating repeated dates for one user as a single day. The result comes back sorted alphabetically.

Summary

Show up every day. Miss one and the count starts over.

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