The O(n) Club: Two Sum II – Sorted Input, Sorted Output, Less Screaming
The O(n) Club: Two Sum II – Sorted Input, Sorted Output, Less Screaming ⚡ TL;DR You have a sorted array, a target, and either a Java IDE or a…
The Mutex Club: Parallel API Mastery with CompletableFuture
Key Insights – Spin off parallel tasks with CompletableFuture.allOf() to slash API wait times. Avoid the common O(N×T) trap by…
The Mutex Club: Mastering CompletableFuture Exception Handling
Key Insights Java’s CompletableFuture is your lifeboat when async code risks sinking into callback hell. Its trio of exception…
The O(n) Club: Partition to K Equal Sum Subsets Without Losing Sanity
The O(n) Club: Partition to K Equal Sum Subsets Without Losing Sanity ⚡ TL;DR Divide an array into k non-empty groups with equal sums. If…
The O(n) Club: Parentheses on the Brink—How to Fix Invalid Parentheses Without Deleting Your Soul
The O(n) Club: Parentheses on the Brink—How to Fix Invalid Parentheses Without Deleting Your Soul ⚡ TL;DR You’ve been handed a string…
The Mutex Club: Master Java CompletableFuture Chaining with thenApply, thenAccept & thenCompose
Key Insights ### thenApply: The Chef’s Slice Synchronous transformer (think Stream.map) that reshapes your result on the same thread. Ideal…
The O(n) Club: Count Complete Tree Nodes Like a Binary Sorcerer
The O(n) Club: Count Complete Tree Nodes Like a Binary Sorcerer ⚡ TL;DR You could count each node in your complete binary tree like a…
The O(n) Club: Surrounded Regions — Don’t Flip Out, Mark the Borders!
The O(n) Club: Surrounded Regions — Don’t Flip Out, Mark the Borders! ⚡ TL;DR Got a board of ‘O’s and ‘X’s? Flip every…
The O(n) Club: Sudoku Solver—Backtracking Without Losing Your Sanity
The O(n) Club: Sudoku Solver—Backtracking Without Losing Your Sanity ⚡ TL;DR Solve Sudoku like you mean it—skip brute force, do backtracking!…
The O(n) Club: Remove K Digits with Stack-Fueled Schadenfreude
The O(n) Club: Remove K Digits with Stack-Fueled Schadenfreude ⚡ TL;DR Want to turn a big, ugly number into its smallest possible self by…