The O(n) Club: Sum Root to Leaf Numbers: Why Trees Love Place Value (LeetCode 129)
The O(n) Club: Sum Root to Leaf Numbers—Why Trees Love Place Value (LeetCode 129) ⚡ TL;DR Take a binary tree stuffed with digits (0–9). Walk…
The Mutex Club: Why Threads and Mutexes Aren’t Always the Answer
Key Insights ### Threads and Mutexes Aren’t Free Ever slapped a thread on your script and felt like a wizard? Threads and mutexes serialize…
The Mutex Club: Functional Concurrency Without the Lock-and-Key Drama
Introduction Welcome to the Mutex Club, where we design out our locks and live to tell the tale. Imagine a kitchen where every ingredient is…
The O(n) Club: Rotate List: How to Not Tie Your Pointers in Knots
The O(n) Club: Rotate List—How to Not Tie Your Pointers in Knots ⚡ TL;DR Rotate a singly linked list right by k spots. Please don’t move the…
The O(n) Club: Surviving Interval List Intersections Without Meltdowns
The O(n) Club: Surviving Interval List Intersections Without Meltdowns ⚡ TL;DR Need to intersect two sorted, non-overlapping interval lists in…
The Mutex Club: Why Immutability Beats Mutexes 📌
Key Insights # Built-in Thread Safety Immutable objects refuse to change after creation, so threads can’t stomp on each other’s data. Think of…
The Mutex Club: Shared Mutability Gave Me Heartburn—Here’s Why
Shared Mutability in a Nutshell Think of shared mutability as letting multiple chefs stir the same soup without coordinating—one dumps salt,…
The O(n) Club: Deleting a Linked List Node When All You Have Is the Node (Not the Head!)
The O(n) Club: Deleting a Linked List Node When All You Have Is the Node (Not the Head!) ⚡ TL;DR Your mission: delete a node in a singly…
The O(n) Club: Valid Palindrome II: Palindrome With Training Wheels
The O(n) Club: Valid Palindrome II – Palindrome With Training Wheels ⚡ TL;DR Basically, you get one free pass. Given a string, can it be a…
The Mutex Club: Why Your Data Cries for a Mutex
Thread-Safe Code: Why Your Data Cries for a Mutex Ever juggled n8n workflows, LangChain calls, and a Pinecone index at 3 a.m. only to find…