What is the complexity of hash tables in C++?

What is the complexity of hash tables in C++?

The average time complexity for search, insert, and delete operations in a hash table is O(1). However, in the worst case, it can be O(n) if many elements hash to the same index.

What factors affect the performance of hash tables?

Factors include the quality of the hash function, load factor, and how collisions are handled. A good hash function minimizes collisions.

Can you explain how collisions are resolved in hash tables?

Collisions can be resolved using methods like chaining, where each bucket contains a list of entries, or open addressing, where we find another open slot.

What is the load factor in hash tables?

The load factor is the ratio of the number of entries to the number of buckets. It helps determine when to resize the hash table to maintain performance.

How do I implement a hash table in C++?

You can implement a hash table using an array and a hash function. You can also use STL's unordered_map for a built-in solution.