String

The O(n) Club: Longest Palindromic Substring — The Algorithm That Reads the Same Backwards (and Forwards, Duh) ⚡ TL;DR Need to impress an…

The O(n) Club: Parentheses on the Brink—How to Fix Invalid Parentheses Without Deleting Your Soul ⚡ TL;DR You’ve been handed a string…

The O(n) Club: Remove K Digits with Stack-Fueled Schadenfreude ⚡ TL;DR Want to turn a big, ugly number into its smallest possible self by…

The O(n) Club: Longest Palindromic Subsequence — Where Dynamic Programming Eats Exponential Time For Breakfast ⚡ TL;DR Given a string,…

The O(n) Club: Palindrome Partitioning – Chop That String Like a Paranoid Chef ⚡ TL;DR Given a string, split it every way you can so every…

The O(n) Club: Longest Common Subsequence – Why Your Files and DNA Both Need Therapy ⚡ TL;DR LCS: finding the longest sequence in two…

The O(n) Club: Palindromic Substrings: The Hunt That Expands Out (Not Downward Spiral) ⚡ TL;DR Counting all contiguous palindromic substrings?…

The O(n) Club: Make Your Trees Portable—The Surprisingly Deadly World of Binary Tree Serialization ⚡ TL;DR Serializing a binary tree means…

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: Longest Common Prefix for Devs Who Love Autocomplete More Than Typing ⚡ TL;DR The mission: Find the longest prefix all strings…