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

Domain

Python

Difficulty

medium

Seniority

L4

Problem

Given a list of activity records (dicts with 'user_id' and 'date' in 'YYYY-MM-DD' format) and an integer min_streak (default 3), find users who have min_streak or more consecutive calendar days of activity. Deduplicate duplicate dates per user. Return the sorted list of qualifying user_ids.

Summary

Login streaks. No gaps allowed.

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