Complete Modern C++ - Unordered Containers (C++11)

The video tutorial explains unordered containers, which are associative containers implemented as hash tables. It covers the types of unordered containers, namely unordered set and unordered map, and their characteristics. The video delves into the mechanics of hash tables, including hashing, load factor, and rehashing. Practical examples demonstrate how to use unordered set and unordered map in code, highlighting their template parameters, performance, and handling of duplicates.

What is the primary characteristic of unordered containers?

• They maintain elements in a sorted order.

• They allow duplicate keys by default.

• They are slower than ordered containers.

• They are implemented as hash tables.

What happens when the load factor of a hash table reaches a certain value?

• The hash table remains unchanged.

• The hash table deletes some elements.

• The hash table shrinks.

• The hash table is rehashed.

Which header file is necessary to use unordered sets in C++?

What is the default behavior of an unordered set regarding duplicate entries?

• It allows duplicate entries.

• It merges duplicate entries.

• It sorts duplicate entries.

• It does not allow duplicate entries.

In an unordered map, what is used to compute the hash?

• A random value.

• The first element of the pair.

• The entire pair object.

• The second element of the pair.

Which function is used to insert elements into an unordered map?

• insert()

• append()

• add()

• push()

What is a key difference between unordered maps and unordered multimaps?

• Unordered multimaps are slower than unordered maps.

• Unordered maps do not allow duplicate keys.

• Unordered multimaps do not allow duplicate keys.

• Unordered maps allow duplicate keys.