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Low Level Design (LLD) Coding

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Multi-Threaded Parentheses Validator

Subhahu JainSubhahu Jain
Sep 20, 20253 min read

Problem: Parallel Parentheses Validator Description You are given a string s of length N consisting only of the characters '(' and ')'. A parentheses...

Multi-Threaded Parentheses Validator

🚚 Delivery Truck Loading System Concurrency Problem

Subhahu JainSubhahu Jain
Aug 22, 20254 min read

📝 Problem Setup A logistics company has multiple loading docks where workers load packages into delivery trucks. Each truck has a weight/volume...

🚚 Delivery Truck Loading System Concurrency Problem

🧩 Jigsaw Puzzle Builder (Parallel Parts) Concurrency Problem

Subhahu JainSubhahu Jain
Aug 9, 20251 min read

🧩 The Problem We’re building a digital jigsaw puzzle game (or simulation) where: The puzzle has many pieces (hundreds or thousands). Each piece can...

🧩 Jigsaw Puzzle Builder (Parallel Parts) Concurrency Problem

📦 Warehouse Packing Simulation Concurrency Problem

Subhahu JainSubhahu Jain
Jul 25, 20252 min read

Let's model a warehouse system where multiple workers pack orders concurrently while managing shared resources. Problem Statement Multiple packing...

📦 Warehouse Packing Simulation Concurrency Problem

🎮 Online Matchmaking (Real-Time Queue Handling) Concurrency Problem

Subhahu JainSubhahu Jain
Jul 24, 20252 min read

Problem Simulate an online matchmaking system where: Players join a matchmaking queue in real-time. When enough players are available (say, 4 or...

🎮 Online Matchmaking (Real-Time Queue Handling) Concurrency Problem

📞 Call Center Queue Concurrency Problem

Subhahu JainSubhahu Jain
Jul 19, 20252 min read

🎯 Objective: Simulate a call center where: There are a limited number of agents (say 3). Many customers (calls) are coming in at the same time. If...

📞 Call Center Queue Concurrency Problem