How do I insert an element into a C++ list?

How do I insert an element into a C++ list?

You can use the push_back() method to insert an element at the end of a list or insert() to add it at a specific position.

Can you show me an example of using insert()?

Sure! Here's an example:

#include <iostream>
#include <list>

int main() {
    std::list<int> myList = {1, 2, 3};
    auto it = myList.begin();
    ++it; // Point to the second element
    myList.insert(it, 10); // Insert 10 before the second element

    for (int n : myList) {
        std::cout << n << ' ';
    }
    return 0;
}

What happens if I try to insert at an invalid position?

If you try to insert at an invalid position, it will result in undefined behavior. Always ensure the iterator is valid.