What is an algorithm? A tiny set of steps.
An algorithm is just a clear recipe for solving a problem. Let’s make one together.
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Arrays are a row of numbered boxes.
Learn how arrays keep many things in one tidy row and help us find them quickly.
Read episodeLinked lists are a treasure chain.
See how little boxes can point to one another, even when they are not side by side.
Read episodeStacks and queues: piles and lines.
A stack is like plates. A queue is like people waiting for ice cream.
Read episodeSearching and sorting a messy toy box.
Learn two ways to find a toy and one simple way to put toys in order.
Read episodeRecursion is a box inside a box.
A function can solve a smaller copy of its own problem. It only needs to know when to stop.
Read episodeTrees grow data from one root.
Trees organize data into parents, children, branches, and leaves.
Read episodeHash tables have smart labels.
Give something a key, and a hash table helps you jump close to its hiding place.
Read episodeGraphs connect places, people, and ideas.
A graph is a set of dots and connections. It can model a city, a friendship, or the web.
Read episodeBig O asks: how fast does the work grow?
Big O compares algorithms by watching what happens when the input gets much bigger.
Read episodeDynamic programming remembers old answers.
Save answers to small repeated problems, then use them to solve one big problem.
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