The O(n) Club: Linked List to BST—the Only Speed Limit is Your Pointer
The O(n) Club: Linked List to BST—the Only Speed Limit is Your Pointer ⚡ TL;DR Turning a sorted singly-linked list into a balanced BST? Sure,…
The O(n) Club: Path Sum II: The Quest for Leafy Sums (or, Why Your Paths Keep Mutating)
The O(n) Club: Path Sum II – The Quest for Leafy Sums (or, Why Your Paths Keep Mutating) ⚡ TL;DR Given a binary tree and a target sum, find…
The Mutex Club: Taming Batch Jobs with Java’s ExecutorService
Key Insights # Batch Submission Patterns Use submit() in a loop or the one-liner invokeAll() to fire off a pile of Callable or Runnable tasks.…
The Mutex Club: Async Chat Servers with Threads & Mutexes
Key Insights Parallel Handling and Shared State Building an async chat server means juggling multiple users (threads or async tasks) while…
The O(n) Club: Valid Sudoku—How Not to Ruin Your Day (or Tech Interview)
The O(n) Club: Valid Sudoku—How Not to Ruin Your Day (or Tech Interview) ⚡ TL;DR Validating Sudoku isn’t about flexing galaxy-brain…
The O(n) Club: Remove Duplicates from Sorted List II (aka Everybody Out!)
The O(n) Club: Remove Duplicates from Sorted List II (aka Everybody Out!) ⚡ TL;DR Given a sorted linked list, kick out everyone who dares show…
The Mutex Club: Why Game Loops Are Smarter Than Your Average Thread Party
Welcome to the Mutex Club (Jacket Optional, Thread Safety Mandatory)\n\nGame engine devs love their threads like coffee: strong and…
The Mutex Club: Kafka Consumers & Multithreading—Stop Sharing, Start Scaling
The Mutex Club: Kafka Consumers & Multithreading—Stop Sharing, Start Scaling Kafka consumers are single-threaded by design—think Chandler…
The O(n) Club: Remove Linked List Elements – How a Dummy Node Keeps You Sane
The O(n) Club: Remove Linked List Elements – How a Dummy Node Keeps You Sane ⚡ TL;DR Your mission: rip every node containing val out of a…
The O(n) Club: Triangle Minimum Path Sum — The Only Pyramid Scheme You’ll Ever Love
The O(n) Club: Triangle Minimum Path Sum — The Only Pyramid Scheme You’ll Ever Love ⚡ TL;DR Solve a triangle of numbers by finding the…