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LLDCoding - Master LLD and Concurrency

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📘 Why Indexes Are Not Free

Subhahu JainSubhahu Jain
Jan 18, 20263 min read

The Silent Cost Behind Fast Reads Indexes don’t make systems faster —they shift cost from reads to writes, memory, and latency tails. 🧠 The...

📘 Why Indexes Are Not Free

🎤 Live Podcast with Guests — Concurrency Problem

Subhahu JainSubhahu Jain
Jan 17, 20264 min read

🧠 Real-World Scenario You’re building a live podcast platform where: A host starts a live podcast session. Multiple guests are invited to...

🎤 Live Podcast with Guests — 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

🏦 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