std::unordered_multiset

This container is a flexible counterpart to std::unordered_set, allowing multiple occurrences of an element. It amalgamates the speed of hashing with the liberty of non-unique elements.

Purpose and suitability

std::unordered_multiset is a hash table-based container that allows you to store multiple equivalent items in an unordered manner. Its primary attractions are as follows:

• Quick average-case insertion and lookup times
• The ability to store multiple items with the same value

It’s particularly suitable in the following scenarios:

• When the order of elements doesn’t matter
• When you anticipate having multiple elements with the same value
• When you want average-case constant time complexity for insertions and lookups

When searching for a container where duplicates are permissible and order isn’t crucial, std::unordered_multiset is a compelling choice.

Ideal use cases

The following are some...