The O(n) Club: BST to Greater Sum Tree: The Rich Get Richer (and So Do You)
The O(n) Club: BST to Greater Sum Tree — The Rich Get Richer (and So Do You) ⚡ TL;DR Want every node in your BST to suddenly feel wealthier?…
The Side Effect Club: Airtable: Simplifying Databases for the No-Code Generation
The Side Effect Club: Airtable: Simplifying Databases for the No-Code Generation The Rise of Airtable: Sweeping Database Dinosaurs off their…
The O(n) Club: Binary Linked List Conversion Without The Fuss
The O(n) Club: Binary Linked List Conversion Without The Fuss ⚡ TL;DR Binary in a singly linked list (MSB at the head) goes to decimal. One…
The O(n) Club: Stock Span, Stacks, and the Brute-Force Blues
The O(n) Club: Stock Span, Stacks, and the Brute-Force Blues ⚡ TL;DR Every day, a stock price appears. For each, report how many days in a row…
The O(n) Club: Sum of Two Integers — Because Who Needs a Plus Sign?
The O(n) Club: Sum of Two Integers — Because Who Needs a Plus Sign? ⚡ TL;DR Your boss took away + and -, but you still have to add two…
The O(n) Club: Binary Tree Pruning: Because Zero Doesn’t Spark Joy
The O(n) Club: Binary Tree Pruning — Because Zero Doesn’t Spark Joy ⚡ TL;DR Got a binary tree infested with zero-only branches? Prune…
The O(n) Club: Design HashMap—Trust Issues, Buckets, and Chaos
The O(n) Club: Design HashMap—Trust Issues, Buckets, and Chaos ⚡ TL;DR Building your own HashMap in Java: for when Copy-Paste isn’t…
The O(n) Club: Cherry Pickup — How to Outwit a Grid of Thorns, Robots, and Regret
The O(n) Club: Cherry Pickup — How to Outwit a Grid of Thorns, Robots, and Regret ⚡ TL;DR Pick cherries in a grid, dodge the thorns, go from…
The O(n) Club: Excel Sheet Column Number – Crack Excel’s Letter-to-Number Code, Finally
The O(n) Club: Excel Sheet Column Number – Crack Excel’s Letter-to-Number Code, Finally ⚡ TL;DR This problem: turn Excel’s column…
The O(n) Club: Reverse Words in a String III — Don’t Flip Out
The O(n) Club: Reverse Words in a String III — Don’t Flip Out ⚡ TL;DR Don’t go full Exorcist—just reverse each word in the sentence, not the…