LLD

Low-Level Design

Class design notes with scope, pseudocode, examples, and revision boxes.

In simple words: Clarify scope, define classes, walk through one happy path and edge cases.

1. Elevator Control System
SCAN movement, request dispatch, simulation, and concurrency
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2. Parking Lot
Multi-floor spots, tickets, compatibility, fees, and safe assignment
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3. LRU Cache
Hash map and doubly linked list for O(1) average get and put
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4. Vending Machine
State machine, inventory, payment, change-making
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5. Library Management
Book copies, loans, due dates, fines
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6. Hello Interview — LLD framework
How to run an LLD interview (offline mirror)
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