Data structures and algorithmic complexity
HE · 50 minutes · Choose structures by their cost.
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Our learning goal
Choose structures by their cost.
Your turn: Choose one thing you would like to understand by the end.
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My lesson notes & project
Full teaching script
- Today: Data structures and algorithmic complexity. Our goal: Choose structures by their cost.
- Take one idea at a time. Pause after each sentence; ask for repetition whenever you need it.
- Arrays give O(1) index, O(n) insert. Hash maps give amortised O(1) lookup. Balanced trees give O(log n) ordered operations. Graphs need BFS for shortest unweighted paths, Dijkstra for weighted. Big-O describes growth, not speed — constants still matter in practice.
- Together: choose one example from the explanation and show how it works. What do you notice?
- Your turn: Implement a hash map and measure collisions at load factors.
- Reflect: what made sense, and what would you like explained differently?
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