The O(n) Club: Search in Rotated Sorted Array II: Why Binary Search Needs Therapy
The O(n) Club: Search in Rotated Sorted Array II — Why Binary Search Needs Therapy ⚡ TL;DR Rotated sorted array got you feeling dizzy? Now…
The O(n) Club: All Possible Parentheses — Recursion Goes Wild
The O(n) Club: All Possible Parentheses — Recursion Goes Wild ⚡ TL;DR Given an expression like “2*3-4*5”, your job is to group…
The O(n) Club: Constructing BST from Preorder — Recursion, Not Regret
The O(n) Club: Constructing BST from Preorder — Recursion, Not Regret ⚡ TL;DR Rebuild a Binary Search Tree from an array that screams…
The O(n) Club: Permutation Sequence: The Algorithmic VIP Pass
The O(n) Club: Permutation Sequence — The Algorithmic VIP Pass ⚡ TL;DR Find the k-th permutation (in lex order) of numbers 1 to n… without…
The O(n) Club: Maximum Width of Binary Tree: Counting Gaps Like a Pro
The O(n) Club: Maximum Width of Binary Tree—Counting Gaps Like a Pro ⚡ TL;DR Width isn’t about how many nodes you see—it’s about the full…
The O(n) Club: Zigzag Conversion – How to Break, Not Break, And Break Your Strings
The O(n) Club: Zigzag Conversion – How to Break, Not Break, And Break Your Strings ⚡ TL;DR Take your input string, sprinkle it…
The O(n) Club: Flood Fill (LeetCode 733): When Your Paint Bucket Actually Needs a Manual
The O(n) Club: Flood Fill (LeetCode 733): When Your Paint Bucket Actually Needs a Manual ⚡ TL;DR You want the code version of MS Paint’s…
The O(n) Club: Non-overlapping Intervals — Uninvite Guests, Save the Buffet
The O(n) Club: Non-overlapping Intervals — Uninvite Guests, Save the Buffet ⚡ TL;DR Got a stack of intervals and need to make sure none of…
The O(n) Club: Jewels and Stones — HashSet Heroics for the Chronically Loopy
The O(n) Club: Jewels and Stones — HashSet Heroics for the Chronically Loopy ⚡ TL;DR You have a string of jewels (unique, case-sensitive,…
The O(n) Club: Redundant Connection — Java’s Answer to Annoying Cycles
The O(n) Club: Redundant Connection — Java’s Answer to Annoying Cycles ⚡ TL;DR Some smart aleck added an extra edge to your tree, turning it…