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Leetcode 3156. Employee Task Duration and Concurrent Tasks
Given a list of tasks with employee IDs and start/end timestamps, compute per-employee total task durations and global concurrency metrics (e.g., maximum concurrent tasks or total time with at least k workers) while correctly handling overlapping intervals. The core challenge is efficient interval merging and counting overlaps at scale, typically solved with sweep-line events, coordinate compression, or segment trees.
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