The O(n) Club: Binary Tree Cameras: Minimum Coverage, Maximum Laziness
The O(n) Club: Binary Tree Cameras—Minimum Coverage, Maximum Laziness ⚡ TL;DR How many cameras do you need to keep an eye on every spot in…
The O(n) Club: Sort Array By Parity: When Evens Take the Lead (and Odds Wait in Line)
The O(n) Club: Sort Array By Parity — When Evens Take the Lead (and Odds Wait in Line) ⚡ TL;DR You want all the even numbers at the start and…
The O(n) Club: Integer Break: How to Multiply Your Happiness (and Numbers)
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.…
The O(n) Club: Maximum Frequency Stack, But Cooler: The Stack That Never Forgets (or Forgives)
The O(n) Club: Maximum Frequency Stack, But Cooler ⚡ TL;DR Your classic stack is LIFO: “Last one in, first one out.” But what if…
The O(n) Club: Spiral Matrix II: Mastering The Swirly-Square Algorithm Without Losing Your Sanity
The O(n) Club: Spiral Matrix II — Mastering The Swirly-Square Algorithm Without Losing Your Sanity ⚡ TL;DR Fill an n x n grid in spiral order…
The O(n) Club: Restore IP Addresses—Dotting Your Way to Sanity
The O(n) Club: Restore IP Addresses—Dotting Your Way to Sanity ⚡ TL;DR Stuff three dots into a digit string until you get every possible valid…
The O(n) Club: Count Binary Substrings — Or, Why Brute Force Devs Cry
The O(n) Club: Count Binary Substrings — Or, Why Brute Force Devs Cry ⚡ TL;DR Count every spot where a run of ‘0’s is immediately…
The O(n) Club: Subarray Sums Divisible by K (Now with Fewer Caffeine-Induced Tears)
The O(n) Club: Subarray Sums Divisible by K (Now with Fewer Caffeine-Induced Tears) ⚡ TL;DR Want to know how many subarrays have sums…
The O(n) Club: Minimum Number of Arrows to Burst Balloons Without Losing (Your Mind)
The O(n) Club: Minimum Number of Arrows to Burst Balloons Without Losing (Your Mind) ⚡ TL;DR This is LeetCode 452, not the Macy’s…
The O(n) Club: Delete Operation for Two Strings — Deleting Your Way to Happiness
The O(n) Club: Delete Operation for Two Strings — Deleting Your Way to Happiness ⚡ TL;DR Want two strings to be identical? Just delete…