What are the advantages of using unordered_map in C++11?

What are the advantages of using unordered_map in C++11?

Unordered_map in C++11 offers several advantages, such as average constant time complexity for insertions, deletions, and lookups.

How does it compare to the traditional map?

Unlike traditional maps, unordered_map uses a hash table, which allows for faster access times on average, but does not maintain order.

Are there any downsides to using unordered_map?

Yes, unordered_map can have higher memory usage due to its underlying hash table and may have worse performance in cases of hash collisions.

When should I prefer unordered_map over map?

You should prefer unordered_map when you need fast access and don't require the elements to be sorted.

Can you give an example of when to use unordered_map?

Sure! If you're implementing a frequency counter for words in a text, unordered_map would be ideal for quick lookups and insertions.