Hash Table vs Unordered Map in C++

What is the difference between a hash table and an unordered map in C++?

A hash table is a data structure that implements an associative array, while an unordered map is a specific implementation of a hash table in C++.

Can you explain how unordered maps handle collisions?

Unordered maps handle collisions using techniques like chaining or open addressing to ensure that multiple keys can be stored.

Which one is faster for lookups, hash table or unordered map?

In C++, unordered maps are generally faster for lookups due to their average constant time complexity, assuming a good hash function.

Are there any downsides to using unordered maps?

Yes, unordered maps can have higher memory overhead and may perform poorly in the worst-case scenario if many collisions occur.