25+ problem explainers
Not answer dumps. You get the intuition, every approach from naive to optimal, and commented solutions in Python, JavaScript, and Java.
// computer science, demystified
The hidden computer science behind everyday tech.
Divide and Quantum takes apart the algorithms, systems, and ideas that quietly run the world, from the code in your phone to the math that lands rockets. Clear enough for anyone. Deep enough for engineers.
// more than a channel
A free learning platform, built the same way.
The videos explain the ideas. The platform makes them yours: a full library of LeetCode-style problem explainers, guided tracks, a foundations course with quizzes, and a community working through it with you. All free with an account.
Guided tracks
Arrays & Hashing through Dynamic Programming, ordered so each pattern builds on the last. No more random-problem roulette.
Courses & quizzes
Big-O, memory, hash maps, recursion. The foundations course makes sure the fundamentals actually stick.
One tap to get in
Sign in with Google and everything opens. No password to invent, no profile, and nothing stored about you.
// why people stick around
Not another “smash that like button” channel.
The goal is simple: you walk away actually understanding something you didn't before, whether you write code for a living or just like knowing how things work.
Deep, but never gatekept
Every episode starts from zero and ends somewhere real. No prerequisites, no hand-waving. Just the actual idea, made clear.
Built by an engineer
Written and made by someone who ships systems and ML in production. The code runs, the math checks out, the history is real.
Animated explainers
Clean visuals that explain instead of decorate, so the “aha” actually lands and sticks.
Companion deep dives
Every video gets a companion post with the full breakdown and a code implementation you can drop straight into your editor.
// recent episodes
Stories the textbooks skip.
Real algorithms, real history, real stakes. Here's a taste of what's on the channel.
01Control systems
The Rejected Algorithm That Helped Land Us on the Moon
A referee called Rudolf Kalman's filter “impossible.” Nine years later it guided Apollo 11 down. Today it runs inside every GPS, drone, and self-driving car.
Watch on YouTube →02Cryptography
The Math Problem That Protects the Entire Internet Is Dying
RSA secures almost every encrypted message on Earth. A big enough quantum computer running Shor's algorithm breaks it. Here's the fragile math, and what's replacing it.
Watch on YouTube →03Security
The Scary Truth About Your Phone's SIM Card
Your SIM is a full computer with a CPU, OS, filesystem, and network stack, running applets you didn't install and can't audit. Here's what's actually inside it.
Watch on YouTube →04Systems
The Bug That Killed the Lights for 55 Million People
A single race condition in power-grid software cascaded into the 2003 Northeast blackout. The story of how one unlocked thread took down a continent.
Watch on YouTube →05Algorithms
The Hidden Algorithm That Runs Your Life: Dijkstra's
It powers Google Maps and internet routing, finds the shortest path through anything. And there's one place it quietly breaks down.
Watch on YouTube →06Data structures
The Hidden Magic of Hash Tables
How your computer finds anything in an instant. Hashing, collisions, and an O(1) lookup built from scratch. It's the workhorse behind almost every program.
Watch on YouTube →07Optimization
The 1947 Algorithm That Routes Every Package You Receive
Dantzig's simplex method was built for Air Force planning. Eighty years on it still schedules airlines, blends gasoline, and routes the box on your doorstep.
Watch on YouTube →08Quantum
Quantum Computers Have a Dirty Secret
Five hard limits that explain why your laptop still beats a quantum computer at almost everything, and what they'll actually be good for.
Watch on YouTube →09Graph theory
How Traders Find Free Money with Graph Theory
Bellman-Ford hunts for negative cycles in a graph of exchange rates. A negative cycle is risk-free profit. Currency arbitrage, explained.
Watch on YouTube →// three small things, one big help
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