Medium

Design a Multi-Floor Parking Lot Object-Oriented Design Interview

Design a parking lot that assigns compatible spots across multiple floors, issues tickets, tracks capacity, and calculates payment when vehicles exit.

Mock Interview with AI

1. Problem Statement

Design a multi-floor parking lot that assigns each arriving vehicle a compatible available spot, issues a ticket, tracks capacity, and releases the spot after calculating the fee at exit.

2. Live Coding Format

Work in the provided coding workspace while explaining your decisions to the live interviewer. Validation may use inline tests, examples, comments, or a verbal walkthrough.

3. Key Focus Areas

1
Vehicle and parking-spot type compatibility
2
Spot allocation and release
3
Ticket lifecycle and fee calculation
4
Capacity display and concurrent allocation

4. What Strong Candidates Should Demonstrate

✓Model vehicles, spots, floors, tickets, and gates with clear ownership.
✓Encapsulate vehicle-to-spot compatibility and occupancy transitions.
✓Separate allocation and pricing policies from parking-lot orchestration.
✓Reason about concurrent entry requests for the last compatible spot.

Want interactive feedback?

Practice this problem in the live coding workspace while the interviewer probes your clarification, implementation, trade-offs, and validation.

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Core Concepts

Object-Oriented DesignAllocation StrategyState Modeling