Implement a Followable Microblog Timeline
Company: Pinduoduo
Role: Software Engineer
Category: Coding & Algorithms
Difficulty: medium
Interview Round: Technical Screen
Overview: Implement an in-memory microblog with posting, following, unfollowing, and a newest-first timeline capped at ten visible tweets. Respect current follow state, permanent self-visibility, idempotent relationship changes, long histories, and the cost of serving users with many followed accounts.
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