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 Mutex Club: Thread.yield()—Java’s Most Misunderstood Nudge
Thread.yield(): Java’s Most Misunderstood Nudge Let’s get something straight: Thread.yield() in Java is the multithreading equivalent of…
The Mutex Club: Thread.sleep() – The Concurrency Clown Nobody Asked For
Key Insights ### Thread.sleep() is a Minimum Wait Thread.sleep() forces the current thread into TIMED_WAITING for at least the duration—even…
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 Mutex Club: Don’t Let Thread.run() Fool You – Unleash True Java Concurrency
Key Insights Thread.run() is just another method call It executes synchronously on the calling thread—no JVM wizardry, no parallelism.…
The Mutex Club: Respecting Java’s Thread.start() 🔒
Key Insights Java’s Thread.start() is the gateway to genuine parallelism. Think of it as sending your code on a separate courier bike instead…
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…