How is the unordered_map used in C++?

unordered_map is an associative container in C++, which allows storing and accessing elements using key-value pairs. It utilizes a hash table to provide constant time insertion, access, and deletion operations in most cases.

Here is how to use the unordered_map:

1. Use the unordered_map library.
2. Create a standard unordered map called “map” with keys of type Key and values of type T.
3. Insert the key and value pair into the map.
4. Assign the value to the key in the map.
5. “He put all his effort into completing the project.”
   – He dedicated all his energy to finishing the project.
6. key map
7. Delete the entry with the specified key from the map.
8. Find the value associated with the key in the map and assign it to the variable it.
9. Iterate through the map and print out each key and value using a for loop.
10. Iterate through the map and print out the key and value pairs.

It is important to note that elements in an unordered_map are stored in an unordered manner, so the order of elements cannot be guaranteed. If you need to access elements in a specific order, consider using std::map.