The O(n) Club: Is Your Graph Bipartite, or Just Awkward?
The O(n) Club: Is Your Graph Bipartite, or Just Awkward? ⚡ TL;DR Want to know if your graph can join the exclusive Bipartite Club? Try…
The O(n) Club: Recovering a Corrupted BST: When Two Nodes Pull a Freaky Friday
The O(n) Club: Recovering a Corrupted BST: When Two Nodes Pull a Freaky Friday ⚡ TL;DR If two nodes in a BST have swapped their values,…
The Mutex Club: Key LRU Cache Insights for the AI Builder
The Mutex Club: Key LRU Cache Insights for the AI Builder TL;DR LRU = hash map + doubly-linked list for O(1) lookups & recency updates.…
The Mutex Club: Why Deadlock Is the Dinner Party Spoiler
Key Insights Deadlock is the system crash you didn’t ask for. In the classic Dining Philosophers scenario, five diners (ahem, threads) each…
The O(n) Club: Remove Duplicate Letters: Stack Attacks and Lex Wins
The O(n) Club: Remove Duplicate Letters—Stack Attacks and Lex Wins ⚡ TL;DR Want one of each letter from your string, perfectly alphabetized?…
The O(n) Club: How to Handle Array Doppelgängers Without Losing Your Sanity
The O(n) Club: How to Handle Array Doppelgängers Without Losing Your Sanity ⚡ TL;DR This is that magical Leetcode problem where duplicates…
The Mutex Club: Golden Rules for Thread Safety 🔒
Key Insights # Minimize Locked Regions Hold locks only around the critical state you must protect. Avoid any I/O, callbacks, or slow work…
The Mutex Club: Why Smart APIs Dodge Deadlocks
Key Insights # Concurrency ≠ Parallelism Throwing more threads at your API isn’t like adding cooks to a kitchen—too many just clutter the…
The O(n) Club: Max Consecutive Ones III: Where Sliding Windows Beat Your WiFi and Your Bugs
The O(n) Club: Max Consecutive Ones III—Where Sliding Windows Beat Your WiFi and Your Bugs ⚡ TL;DR Want to binge 1s in your binary array by…
The O(n) Club: Exponentiation by Squaring in Java – Because Your CPU Has Feelings Too
The O(n) Club: Exponentiation by Squaring in Java – Because Your CPU Has Feelings Too ⚡ TL;DR If you’re still looping through n…