Abstract Algorithms

coding interview

2 articles across 2 sub-topics

Implement LLD for Parking Lot: Code Walkthrough

TLDR: This is the code companion to the Parking Lot System Design post. We implement the core classes (ParkingLot, ParkingSpot, Ticket) in Java, apply the Singleton, Factory, and Strategy patterns, and use a Min-Heap to find the nearest available spo...

Mar 9, 2026•26 min read

Algorithms(1)

Exploring Backtracking Techniques in Data Structures

TLDR: Backtracking is "Recursion with Undo." You try a path, explore it deeply, and if it fails, you undo your last decision and try the next option. It explores the full search space but prunes invalid branches early, making it far more efficient th...

Mar 9, 2026•13 min read