The Mutex Club: Mastering Java Parallel Merge Sort with ForkJoinPool
Key Insights # Divide and Conquer with ForkJoinPool ForkJoinPool is Java’s answer to your recursive parallel fantasies. It splits your array…
The O(n) Club: Majority Element II and the Pigeonhole Plot Twist
The O(n) Club: Majority Element II and the Pigeonhole Plot Twist ⚡ TL;DR Need to spot every array element that appears more than n/3 times?…
The O(n) Club: Permutation in String — Where Brute Force Goes To Die
The O(n) Club: Permutation in String — Where Brute Force Goes To Die ⚡ TL;DR Given two strings, does s2 have a substring that’s a…
The Mutex Club: Mastering Singletons, Thread Safety & Double-Checked Locking
Key Insights # One Instance Only The singleton pattern guarantees a single class instance and global access. It’s ideal for loggers,…
The Mutex Club: How Semaphore-Based Rate Limiters Actually Work (and Why They’re More Than Just Fancy Locks)
Semaphore Rate Limiting: The Velvet Rope for Your Threads Ever felt like your backend needed a bouncer? Enter semaphores. While mutexes get…
The O(n) Club: Reorganize String (Or How to Avoid Awkward Repeats)
The O(n) Club: Reorganize String (Or How to Avoid Awkward Repeats) ⚡ TL;DR Your string is throwing a party, but it can’t have two guests…
The O(n) Club: Why Splitting Arrays Feels Like Filing Taxes (LeetCode 410 Explained)
The O(n) Club: Why Splitting Arrays Feels Like Filing Taxes (LeetCode 410 Explained) ⚡ TL;DR You’ve got a rowdy array, and you want to…
The Mutex Club: How (and Why) to Build a Thread-Safe LRU Cache
The Thread-Safe LRU Cache, Deconstructed So you want to join the Mutex Club—the secret society of devs who actually ship high-performance…
The Dining Philosophers Problem: When Concurrency Goes From Fine Dining to Food Fight
Hungry for Answers: The Dining Philosophers Problem 🍽️ Picture this: five intellectuals, a bunch of forks, and way too much time to overthink.…
The O(n) Club: Unique Paths II—Help, My Robot Can’t Even (LeetCode 63 Edition)
The O(n) Club: Unique Paths II—Help, My Robot Can’t Even (LeetCode 63 Edition) ⚡ TL;DR You’re coding a grid-crawling robot, but…