Why should you care?

Without complexity intuition, every solution looks fine until n grows.

See it live — copy this example

Run snippets in a .NET console app, LINQPad, or https://dotnetfiddle.net. Write Big O above every solution.

// Recursion vs Iteration
Console.WriteLine("Focus: complexity + correct structure");
// Ask: input size n? worst-case ops?

What happened?

• State n, count dominant operations, and name the Big O class.
• Follow the steps below — typing the code yourself is the fastest way to learn.

Practice next

1. Type the snippet in a C# console or LINQPad.
2. Write Big O on top of your solution.
3. Test empty / single-element edge cases.
4. Add a failing test then fix it.
5. Rename variables to domain words.

Remember

You can code a small C# example for Recursion vs Iteration. You know the complexity class. You tested at least one edge case.

Recursion vs Iteration drill

AlgoVerse interview prompt on recursion vs iteration.

Outcome: You recognize the pattern and ship a correct C# sketch.