The O(n) Club: Max Area of Island — Because DFS Is Land Lord
The O(n) Club: Max Area of Island — Because DFS Is Land Lord ⚡ TL;DR You get a grid of 0s (water) and 1s (land). Your mission, should you…
The O(n) Club: Reorder List: When Your Linked List Needs a Hollywood Makeover (Pointer Edition)
The O(n) Club: Reorder List — When Your Linked List Needs a Hollywood Makeover (Pointer Edition) ⚡ TL;DR Want to glam up your linked list so…
The O(n) Club: Palindrome Partitioning – Chop That String Like a Paranoid Chef
The O(n) Club: Palindrome Partitioning – Chop That String Like a Paranoid Chef ⚡ TL;DR Given a string, split it every way you can so every…
The O(n) Club: Best Time to Buy and Sell Stock III: Survive the Two-Trade Gauntlet
The O(n) Club: Best Time to Buy and Sell Stock III — Survive the Two-Trade Gauntlet ⚡ TL;DR Buy, sell, buy, sell—can you time these two trades…
The O(n) Club: Stock Profit With Cooldown: Because Wall Street Needs Naps Too
The O(n) Club: Stock Profit With Cooldown—Because Wall Street Needs Naps Too ⚡ TL;DR If you want to buy and sell stocks for max profit but…
The O(n) Club: Kth Smallest in a Sorted Matrix: Aka Why Binary Search Beats Brute Force (and Caffeine)
The O(n) Club: Kth Smallest in a Sorted Matrix: Aka Why Binary Search Beats Brute Force (and Caffeine) ⚡ TL;DR You want the kth smallest…
The O(n) Club: 4Sum — When Just One More Loop Feels Like a Crime
The O(n) Club: 4Sum — When Just One More Loop Feels Like a Crime ⚡ TL;DR Find four numbers in your array that make a target sum. Yes, you…
The O(n) Club: Word Search II: Why Your Brute Force Solution Needs an Intervention
The O(n) Club: Word Search II—Why Your Brute Force Solution Needs an Intervention ⚡ TL;DR Want to find every dictionary word in a letter grid,…
The O(n) Club: Longest Common Subsequence – Why Your Files and DNA Both Need Therapy
The O(n) Club: Longest Common Subsequence – Why Your Files and DNA Both Need Therapy ⚡ TL;DR LCS: finding the longest sequence in two…
The O(n) Club: Swap Nodes in Pairs — No, You Can’t Just Swap Values
The O(n) Club: Swap Nodes in Pairs — No, You Can’t Just Swap Values ⚡ TL;DR Take a singly linked list and actually swap every pair of…