The O(n) Club: Course Schedule II’s Topological Soap Opera
The O(n) Club: Course Schedule II’s Topological Soap Opera ⚡ TL;DR LeetCode 210 is just course scheduling pretending to be about academics.…
The O(n) Club: Find All Numbers Disappeared in an Array — Now With Extra Negativity
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: Target Sum — Why Subset Sums Deserve an Oscar for Best Disguise
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: Spiral Matrix — How to Spiral Without Actually Losing Your Mind
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: Reverse Nodes in K-Group: Now You’re Juggling Pointers and Sanity
The O(n) Club: Reverse Nodes in K-Group — Now You’re Juggling Pointers and Sanity ⚡ TL;DR Reverse your singly-linked list in groups of k…
The O(n) Club: Task Scheduler Idle Madness (and the Math That Saves You)
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
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…
The O(n) Club: Median from Data Stream—How Heaps Became Your Streaming BFF
The O(n) Club: Median from Data Stream—How Heaps Became Your Streaming BFF ⚡ TL;DR Still sorting your whole list every time for the median,…
The O(n) Club: Decode Ways — How Zeros Spoil All Your Fun (and DP Saves You)
The O(n) Club: Decode Ways — How Zeros Spoil All Your Fun (and DP Saves You) ⚡ TL;DR Given a string of digits, count all the ways to map it to…
The O(n) Club: Perfect Squares Problem—Counting Squares Without Losing Yours
The O(n) Club: Perfect Squares Problem—Counting Squares Without Losing Yours ⚡ TL;DR Given a number n, find the minimum count of perfect…