Warehouse Drone Dispatch

A vertical warehouse uses autonomous drones to fulfill package requests. Each drone is at a specific floor and has one of three states: "ascending", "descending", or "hovering". A package request specifies a floor and a direction ("up" or "down", indicating the drone must be able to continue in that direction to reach the destination).

Given a list of drones and a single package request, assign the most suitable drone using these eligibility rules: ...