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Low Level Design (LLD) Coding

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concurrency

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🎮 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

🏦 Bank Transaction Concurrency Problem

Subhahu JainSubhahu Jain
Jul 8, 20252 min read

Problem Statement Multiple threads (ATM users, online banking) access shared bank...

🏦 Bank Transaction Concurrency Problem

🚂 Train Deadlock Concurrency Problem

Subhahu JainSubhahu Jain
Jul 7, 20252 min read

Problem Statement Multiple trains run on a shared circular track (like a subway loop). Only one train can occupy a track segment at a time (mutual...

🚂 Train Deadlock Concurrency Problem

🚦 Traffic Light Concurrency Problem

Subhahu JainSubhahu Jain
Jul 5, 20252 min read

Problem Statement:Simulate a traffic intersection where: Multiple roads (threads) lead to a single intersection (shared resource). Only one...

🚦 Traffic Light Concurrency Problem

Problem I: Thread-Safe Two-Sum Checker

Subhahu JainSubhahu Jain
Dec 31, 20233 min read

Design a shared data structure that allows multiple threads to insert numbers and check for two-sum pairs without race...

Problem I: Thread-Safe Two-Sum Checker