Loading Dock Buffer

A logistics center has trucks arriving with [start_time, end_time]. After a truck finishes using a dock, a buffer period of 'B' minutes is required for cleanup before another truck can use the same dock. Find the minimum number of docks required to accommodate all trucks. Example: Input: N=3, B=5 Trucks: [10, 20], [15, 25], [22, 30] Truck 1: Dock 1 (Ends 20, free at 25) Truck 2: Needs Dock 2 (Ends 25, free at 30) Truck 3: Needs Dock 3 (Arrives 22, Dock 1 not free until 25) Output: 3