Twitter Spaces Active Hours Tracking

Problem Overview

Given a list of operation records, each containing (operation, twitter_space_id, user_id, timestamp) where operation is one of 'create', 'join', or 'leave', compute the total active duration for each Twitter Space. Example input: ["create", "abc", "user_1", "1234567000"] ["join", "abc", "user_2", "1234567100"] ["leave", "abc", "user_2", "1234567300"] ["create", "def", "user_2", "1234568000"] ["leave", "def",…

• 2 candidate-reported follow-ups — the exact probes interviewers asked, with the trigger for each
• The rest of the problem statement — full requirements, constraints, and edge cases
• Approach and trade-offs — what passing candidates did, and the mistakes that sink people