Leetcode 2783. Flight Occupancy and Waitlist Analysis

Simulate and analyze a stream of booking, cancellation, and waitlist events across multiple flights to compute metrics such as current/max occupancy, waitlist lengths, and wait times under fixed seat-capacity constraints. The task centers on time-ordered event processing and efficient per-flight state maintenance (sorting/timestamps, counters, and priority queues or maps) to produce the required aggregates.