Class identification (ParkingLot, Floor, Spot, Vehicle) in LLD - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Identify the primary responsibility of the ParkingLot class

In a parking lot system, which of the following best describes the main responsibility of the ParkingLot class?

A Represent a single floor within the parking lot

B Represent a single parking spot where a vehicle can park

C Manage the overall parking facility including floors and spots

D Track the details of a vehicle such as license plate and type

💡 Hint

Think about which class would oversee the entire parking structure.

The ParkingLot class manages the entire parking facility, including multiple floors and parking spots. Other classes represent smaller components.

🧠 Conceptual

intermediate

Which class should handle vehicle parking logic?

In the parking lot system, which class is best suited to handle the logic of parking a vehicle into a spot?

A Floor

B Spot

C Vehicle

D ParkingLot

💡 Hint

Consider which class represents the place where a vehicle actually parks.

The Spot class represents a parking spot and should handle parking and freeing the spot for vehicles.

❓ Architecture

advanced

Determine the correct relationship between Floor and Spot classes

Which of the following best describes the relationship between Floor and Spot classes in a parking lot system?

A Spot inherits from Floor to reuse properties

B Spot contains multiple Floor objects representing levels

C Floor and Spot are unrelated and operate independently

D Floor contains multiple Spot objects representing parking spaces

💡 Hint

Think about how floors and spots are organized in a real parking lot.

A Floor contains many Spot objects, each representing a parking space on that floor.

❓ scaling

advanced

Scaling the ParkingLot system for multiple vehicle types

To support different vehicle types (car, motorcycle, truck) with different spot sizes, which class should be extended or modified?

A Extend Vehicle class to include type and size, and modify Spot to check compatibility

B Modify ParkingLot to assign spots based on vehicle type only

C Add vehicle type logic only in Floor class without changing Spot or Vehicle

D Create separate ParkingLot instances for each vehicle type

💡 Hint

Consider where vehicle size and spot size compatibility should be checked.

Vehicle class should include type and size, and Spot should verify if it can accommodate the vehicle type before parking.

❓ tradeoff

expert

Choosing the best class to track parking spot availability efficiently

For efficient tracking of available parking spots in a large parking lot, which class should maintain the availability data and why?

A Each Floor should maintain availability for its spots to reduce ParkingLot complexity

B ParkingLot should maintain a global availability map for all spots to enable quick lookup

C Each Spot should maintain its own availability and ParkingLot queries all spots directly

D Vehicle class should track availability as it knows which spots are occupied

💡 Hint

Think about balancing data centralization and query efficiency.

Having each Floor maintain availability reduces the complexity at ParkingLot level and allows faster queries per floor.