What is the performance of std::unordered_map in C++11?

What is the performance of std::unordered_map in C++11?

The std::unordered_map in C++11 offers average constant time complexity for insertions, deletions, and lookups.

How does it compare to std::map?

Unlike std::map, which is ordered and has logarithmic time complexity, std::unordered_map is faster for most operations.

Are there any downsides to using std::unordered_map?

Yes, it uses more memory due to hashing and can have performance issues with poor hash functions.

What are some best practices for using std::unordered_map?

Use a good hash function, avoid excessive resizing, and consider the load factor for optimal performance.