The Mutex Club: Coordinating Threads in Phases with Phaser
TL;DR Ever tried corralling chatty threads that need to wait on each other? Java’s Phaser is your airtight club bouncer. It handles variable…
The Mutex Club: CountDownLatch: Waiting for Threads Like a Boss
The Mutex Club: CountDownLatch — Waiting for Threads Like a Boss (and Not Getting Burned) Concurrency can feel like juggling flaming…
The Mutex Club: Divide & Conquer with ForkJoinPool
Key Insights # Work-Stealing Algorithm Java’s ForkJoinPool turns each worker thread into a task thief. Every thread owns a double-ended queue…
The O(n) Club: Subtree of Another Tree: How to Find Doppelgänger Branches (and Not Lose Your Mind)
The O(n) Club: Subtree of Another Tree – How to Find Doppelgänger Branches (and Not Lose Your Mind) ⚡ TL;DR Want to know if subRoot is…
The O(n) Club: Delete Node in a BST — When Trees Demand Therapy
The O(n) Club: Delete Node in a BST — When Trees Demand Therapy ⚡ TL;DR Deleting a node in a BST is three things: drama-free for leaves,…
The Mutex Club: Blocking Queues in Executors: Types and Use Cases
Introduction: Taming the Thread Stampede Ever watched your Java thread pool duct-tape itself together under load? That’s the BlockingQueue in…
The Mutex Club: Building a Custom ThreadPoolExecutor
Key Insights ### Core vs. Max Threads Core Pool Size: The steady squad of worker threads always ready to tackle tasks. Max Pool Size: That…
The O(n) Club: Path Sum and the Java Leaf-Hunting Gauntlet
The O(n) Club: Path Sum and the Java Leaf-Hunting Gauntlet ⚡ TL;DR Loyal binary searchers, here’s the deal: You want to know if any…
The O(n) Club: Queue Reconstruction by Height is Just Tall-Tale Sorting
The O(n) Club: Queue Reconstruction by Height is Just Tall-Tale Sorting ⚡ TL;DR You get a list of [height, k] for people—k means “number of…
The O(n) Club: Longest Increasing Path in a Matrix — Because Who Needs Diagonals?
The O(n) Club: Longest Increasing Path in a Matrix — Because Who Needs Diagonals? ⚡ TL;DR Find the longest path in a matrix by moving up,…