How do I choose between a map or a set in C++?

How do I choose between a map or a set in C++?

It depends on your use case. A map is a key-value pair collection, while a set is a collection of unique elements.

Can you give me an example of when to use a map?

Sure! Use a map when you need to associate unique keys with values, like storing user IDs with user information.

And when should I use a set?

Use a set when you need to store unique items and don't care about the order, like a collection of unique tags.

What are the performance differences between them?

Maps generally have O(log n) complexity for insertions and lookups, while sets have similar performance but are optimized for unique elements.