The O(n) Club: Interleaving String — Your DP Soap Opera Starter Pack
The O(n) Club: Interleaving String — Your DP Soap Opera Starter Pack ⚡ TL;DR Check if s3 is a flawless mashup of s1 and s2, but don’t mess…
The O(n) Club: Non-decreasing Array — Change Once Or Never
The O(n) Club: Non-decreasing Array — Change Once Or Never ⚡ TL;DR This LeetCode classic asks: Can you rescue your out-of-order array by…
The O(n) Club: Best Time to Buy and Sell Stock with a Transaction Fee (Or, How to Not Get Fleeced by the Middleman)
The O(n) Club: Best Time to Buy and Sell Stock with a Transaction Fee (Or, How to Not Get Fleeced by the Middleman) ⚡ TL;DR Maximize stock…
The O(n) Club: Minimum Depth of Binary Tree – Stop Calling Null a Leaf
The O(n) Club: Minimum Depth of Binary Tree – Stop Calling Null a Leaf ⚡ TL;DR Shortest path from root to an actual leaf (not a lonely child…
The Mutex Club: BlockingQueue Solves the Bounded Buffer Problem
TL;DR BlockingQueue in Java is the bounded buffer you didn’t know you needed: fixed-size, FIFO-ordered, thread-safe by default. put()…
The O(n) Club: Longest Substring with At Least K Repeating Characters — Chop Shop Edition
The O(n) Club: Longest Substring with At Least K Repeating Characters — Chop Shop Edition ⚡ TL;DR Your PM says, “Give me the longest…
The O(n) Club: All the Binary Tree Paths Your Leaves Will Ever Need
The O(n) Club: All the Binary Tree Paths Your Leaves Will Ever Need ⚡ TL;DR You want every root-to-leaf path in a binary tree? Great! DFS is…
The Mutex Club: Mastering Java Executors with Fixed & Cached Thread Pools
Key Insights ### Executors Factory Methods The Executors class is your one-stop shop for thread pool creation. Instead of wrestling with…
The Mutex Club: Demystifying Barrier Synchronization
Key Insights # Barrier Basics Imagine a relay race where every runner must wait at a checkpoint before the next leg. That’s barrier…
The O(n) Club: Network Delay Time, Java, and Your Shortcut to Dijkstra’s Fame
The O(n) Club: Network Delay Time, Java, and Your Shortcut to Dijkstra’s Fame ⚡ TL;DR Picture a network where you yell “coffee’s ready!” down…