How do I insert elements into a C++ std::vector?

How do I insert elements into a C++ std::vector?

You can use the push_back() method to add elements to the end of a std::vector. For example: vec.push_back(10);.

Can I insert elements at a specific position?

Yes, you can use the insert() method. For example: vec.insert(vec.begin() + 1, 20); inserts 20 at the second position.

What happens if I insert beyond the current size?

Inserting beyond the current size is not allowed directly. You need to ensure the position is valid, or use push_back() to add to the end.

Are there any performance considerations I should be aware of?

Yes, inserting elements can be costly if it requires reallocating memory. It's better to reserve space in advance if you know the size.