Why should you care?

Sorted data unlocks binary search and two pointers.

See it live — copy this example

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

Array.Sort(a); // introsort
// Binary Search
int i = Array.BinarySearch(a, target);

What happened?

• Know library sort costs and when to build a named algorithm.
• 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 Binary Search. You know the complexity class. You tested at least one edge case.

Binary Search drill

AlgoVerse interview prompt on binary search.

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