The O(n) Club: Best Time to Buy and Sell Stock: Because Margins and Caffeine Can Only Do So Much
The O(n) Club: Best Time to Buy and Sell Stock: Because Margins and Caffeine Can Only Do So Much ⚡ TL;DR One shot at glory: buy low, sell…
The O(n) Club: Rotated Binary Search Mania (feat. Dizzy Arrays & Java)
The O(n) Club: Rotated Binary Search Mania (feat. Dizzy Arrays & Java) ⚡ TL;DR Sorted array had a quarter-life crisis and rotated, but…
The O(n) Club: Letter Case Permutation — Brute Force Meets Java’s Fashion Police
The O(n) Club: Letter Case Permutation — Brute Force Meets Java’s Fashion Police ⚡ TL;DR You get a string. For every letter, you swap its case…
The O(n) Club: Binary Tree Level Order Traversal II – Boss Mode Unlocked
The O(n) Club: Binary Tree Level Order Traversal II – Boss Mode Unlocked ⚡ TL;DR Need to traverse a tree from leaf to root, level by level?…
The O(n) Club: Valid Palindrome: Why Your String Doesn’t Care About Punctuation
The O(n) Club: Valid Palindrome – Why Your String Doesn’t Care About Punctuation ⚡ TL;DR Check if a string’s a palindrome, but ignore…
The O(n) Club: Longest Univalue Path: When Trees, Edges, and Your Patience All Snap
The O(n) Club: Longest Univalue Path — When Trees, Edges, and Your Patience All Snap ⚡ TL;DR Find the longest path—counted in edges, not…
The O(n) Club: Score of Parentheses—Where Mildly Annoying Brackets Become Mathematical Fireworks
The O(n) Club: Score of Parentheses—Where Mildly Annoying Brackets Become Mathematical Fireworks ⚡ TL;DR Don’t (re)curse yourself! You…
The O(n) Club: Longest String Chain — The O(n) Club Edition
The O(n) Club: Longest String Chain — The Interview Jenga That Breaks Spirits ⚡ TL;DR Find the biggest possible chain where each word is built…
The O(n) Club: Hamming Distance: When Your Bits Can’t Agree (And Why XOR is King)
The O(n) Club: Hamming Distance — When Your Bits Can’t Agree (And Why XOR is King) ⚡ TL;DR How many bits do x and y disagree on? XOR them,…
The O(n) Club: Taming LeetCode’s Flatten Nested List Iterator Without Losing Your Mind
The O(n) Club: Taming LeetCode’s Flatten Nested List Iterator Without Losing Your Mind ⚡ TL;DR If you thought recursion was wild, try feeding…