Interview Guides
Implement a basic object-oriented parking lot system. Design Python classes to support parking and unparking vehicles, tracking available spots by vehicle type, and issuing a ticket when a vehicle is parked. The function should process a list of operations and return the outputs of query operations.
1 <= levels <= 200 <= spots_per_level[type] <= 100 for each of bike, car, truck1 <= len(operations) <= 10^4park, unpark, or available