The O(n) Club: BST Mode Madness — Why HashMaps Are Out, and In-Order Is In
The O(n) Club: BST Mode Madness — Why HashMaps Are Out, and In-Order Is In ⚡ TL;DR Your task: Find the value(s) with the highest frequency…
The O(n) Club: Integer to English Words — There’s Nothing Regular About English, Sorry
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: Partition Array for Maximum Sum – Your Brain vs. Brute Force
The O(n) Club: Partition Array for Maximum Sum – Your Brain vs. Brute Force ⚡ TL;DR Split your array into chunks of up to k—not exactly k, not…
The O(n) Club: Smallest Range from K Lists: Heapify or Cry in Brute Force
The O(n) Club: Smallest Range from K Lists—Heapify or Cry in Brute Force ⚡ TL;DR If you want the smallest interval covering one number from…
The O(n) Club: Wiggle Sort II: The Interview Pattern That Spoils Dev Confidence
The O(n) Club: Wiggle Sort II — The Interview Pattern That Spoils Dev Confidence ⚡ TL;DR If you still think Wiggle Sort II is just another…
The O(n) Club: Next Greater Node in a Linked List—Stack Sorcery, Java Edition
The O(n) Club: Next Greater Node in a Linked List—Stack Sorcery, Java Edition ⚡ TL;DR Every node in your singly linked list wants to know, “Is…
The O(n) Club: Minimum Swaps To Make Sequences Increasing (or, Why Parallel Universes Matter)
The O(n) Club: Minimum Swaps To Make Sequences Increasing (or, Why Parallel Universes Matter) ⚡ TL;DR You get two number arrays. You want both…
The O(n) Club: Kth Missing Positive Number, or Why Your Integers Keep Vanishing
The O(n) Club: Kth Missing Positive Number, or Why Your Integers Keep Vanishing ⚡ TL;DR If you want the kth missing positive integer from a…
The O(n) Club: Peak Index in a Mountain Array: Because Who Has Time to Climb the Whole Thing?
The O(n) Club: Peak Index in a Mountain Array—Because Who Has Time to Climb the Whole Thing? ⚡ TL;DR You’re staring at an array that goes up,…
The O(n) Club: Shuffle the Array: When ‘Shuffle’ Means Bring a Spreadsheet to a Card Table
The O(n) Club: Shuffle the Array—When ‘Shuffle’ Means Bring a Spreadsheet to a Card Table ⚡ TL;DR LeetCode 1470 calls it…