Math

The O(n) Club: Integer to English Words — There’s Nothing Regular About English, Sorry ⚡ TL;DR You’re converting a number like 12345…

The O(n) Club: Robot Bounded in Circle—How to Stop Your Robot From Moonwalking to Infinity ⚡ TL;DR Does your robot know when to stop, or is it…

The O(n) Club: Super Egg Drop — How to Crack It Without Losing All Your Eggs (or Dignity) ⚡ TL;DR Given k eggs and n floors, how few moves do…

The O(n) Club: LeetCode 670 Maximum Swap — Greedy Digit Hustle Unleashed ⚡ TL;DR Got a non-negative integer? Swap two digits (once) to get the…

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: Excel Sheet Column Number – Crack Excel’s Letter-to-Number Code, Finally ⚡ TL;DR This problem: turn Excel’s column…

The O(n) Club: When Prime Factors Make You a Copy-Paste Ninja (2 Keys Keyboard) ⚡ TL;DR You have two buttons and a dream: Copy All and Paste.…

The O(n) Club: Excel Sheet Column Title — The “A-Z” That Breaks Brains ⚡ TL;DR Turn a number into Excel’s loopy column…

The O(n) Club: Expression Add Operators—The Recursion-Induced Headache Edition ⚡ TL;DR Take a string of digits. Insert ‘+’,…

The O(n) Club: Integer Break — How to Multiply Your Happiness (and Numbers) ⚡ TL;DR Split your number n into at least two positive integers.…