What is an unordered map in C++11?

Can you explain what an unordered map is in C++11?

Sure! An unordered map in C++11 is a hash table-based container that stores key-value pairs. It allows for fast retrieval of values based on their keys.

What are the advantages of using an unordered map over a regular map?

The main advantage is performance. Unordered maps provide average constant time complexity for lookups, insertions, and deletions, while regular maps have logarithmic time complexity.

Are there any drawbacks to using unordered maps?

Yes, unordered maps use more memory due to their underlying hash table structure, and the order of elements is not maintained.

How do I declare and initialize an unordered map in C++?

You can declare an unordered map like this: std::unordered_map<int, std::string> myMap; and initialize it using curly braces: `myMap = {{1, "one"}, {2, "two"}};"