What are the standard library containers in C++?

What are the standard library containers in C++?

The C++ standard library provides several containers like vector, list, deque, set, map, and unordered_map. Each serves different purposes.

Can you explain the differences between vector and list?

Sure! A vector is a dynamic array that allows random access and is efficient for adding/removing elements at the end. A list is a doubly linked list, which is better for inserting/removing elements from anywhere but doesn't allow random access.

When should I use a map instead of an unordered_map?

Use a map when you need ordered keys and can afford the overhead of maintaining order. Use unordered_map for faster access when order doesn't matter.

What is the complexity of accessing elements in a vector?

Accessing elements in a vector has a time complexity of O(1) due to its contiguous memory allocation.