The Mutex Club: Lock-Free Atomic Counters with CAS 🚀
Forget refereeing thread arguments yourself — let CAS handle the quarreling. ## Key Insights # Atomic Variables and CAS in a Nutshell Wrap…
The O(n) Club: Single Number II: That One Rogue Bit Nobody Likes
The O(n) Club: Single Number II—That One Rogue Bit Nobody Likes ⚡ TL;DR Given an array where every number appears three times except one…
The O(n) Club: Binary Tree Postorder Traversal—Why the Cleanup Crew Wins
The O(n) Club: Binary Tree Postorder Traversal—Why the Cleanup Crew Wins ⚡ TL;DR You want to visit the left child, then the right child, then…
The Mutex Club: Lock Ordering for Deadlock-Free Bank Transfers
The Deadlock Dilemma Ever seen your payment processor come to a screeching halt? When two threads try to swap funds between accounts A and B…
The Mutex Club: Futures, Timeouts, and Avoiding Thread Hell ⏱️
TL;DR: Timeout your Futures or face thread starvation, deadlocks, and cursed automations. ## Key Insights # Timeouts Aren’t Optional…
The O(n) Club: Become the Overlord of Longest Repeating Character Replacements (Sliding Window Style)
The O(n) Club: Become the Overlord of Longest Repeating Character Replacements (Sliding Window Style) ⚡ TL;DR Here’s the interview…
The O(n) Club: Sort Characters By Frequency — and Stop Overengineering It
The O(n) Club: Sort Characters By Frequency — and Stop Overengineering It ⚡ TL;DR Your job: shuffle the string so that characters with the…
The Mutex Club: Thread Lifecycle Secrets for Next-Level Debugging
Thread debugging giving you nightmares? Flip the light switch with lifecycle insights. ## Why Debugging Threads is a Headache—Until You See…
The Mutex Club: Semaphore Gatekeepers for Concurrency Control
Introduction Ever felt your system choke when too many jobs try to party at once? Think of semaphore-based rate limiting as the bouncer…
The O(n) Club: Range Sum of BST — Prune or Perish Edition
The O(n) Club: Range Sum of BST — Prune or Perish Edition ⚡ TL;DR You’re told to sum BST node values within [low, high]. If you brute…