C++ Vector Iterator vs List Iterator

What is the difference between a vector iterator and a list iterator in C++?

In C++, a vector iterator allows random access to elements, while a list iterator only allows sequential access.

Can you explain why vector iterators are faster than list iterators?

Vector iterators are faster because they provide direct access to elements in contiguous memory, reducing overhead.

Are there any scenarios where I should prefer using a list iterator?

Yes, if you need frequent insertions or deletions in the middle of the collection, a list iterator is more efficient.

What about memory usage? How do they compare?

Vectors use less memory overhead compared to lists, which require additional memory for pointers in each node.

Can you give an example of using both iterators in code?

Sure! Here's a simple example:

std::vector<int> vec = {1, 2, 3};
for(auto it = vec.begin(); it != vec.end(); ++it) {
    std::cout << *it << ' ';
}

std::list<int> lst = {1, 2, 3};
for(auto it = lst.begin(); it != lst.end(); ++it) {
    std::cout << *it << ' ';
}