Array

The O(n) Club: Search a 2D Matrix: Stop Nesting and Start Flattening ⚡ TL;DR This sorted 2D matrix wants you to get clever, not just…

The O(n) Club: Rotated Array Minimum—Coffee-Powered Binary Search (Java Edition) ⚡ TL;DR Looking for the smallest element in a rotated sorted…

The O(n) Club: Set Matrix Zeroes — A Griddy Matrix Meltdown ⚡ TL;DR Every zero in your grid? Nuke the whole row and column. The catch: Do it…

The O(n) Club: Convert Sorted Array to BST – Arrays Deserve a Glow-Up Too ⚡ TL;DR You want a balanced BST from your nice, sorted array. The…

The O(n) Club: Rotting Oranges – How Fast Can You Spoil Lunch? ⚡ TL;DR Staring at a grid of oranges where some are gross (rotten) and some are…

The O(n) Club: Find All Numbers Disappeared in an Array — Now With Extra Negativity ⚡ TL;DR Caffeine fading fast? In short: You’ve got an int…

The O(n) Club: Spiral Matrix — How to Spiral Without Actually Losing Your Mind ⚡ TL;DR Spiral Matrix: Peel the matrix like you would an…

The O(n) Club: Target Sum — Why Subset Sums Deserve an Oscar for Best Disguise ⚡ TL;DR Want your array to hit the target by just flipping plus…

The O(n) Club: Task Scheduler Idle Madness (and the Math That Saves You) ⚡ TL;DR Given a list of tasks and a cooldown period, schedule them so…

The O(n) Club: Maximal Rectangle — How Histograms Secretly Run the Grid ⚡ TL;DR If you’re hunting for the biggest rectangle of 1’s…