How do I erase elements from a C++ STL vector?

How do I erase elements from a C++ STL vector?

You can use the erase method to remove elements from a vector. For example, vec.erase(vec.begin() + index); removes the element at the specified index.

What if I want to remove multiple elements?

You can use the erase method with an iterator range. For example, vec.erase(vec.begin() + start, vec.begin() + end); removes elements from start to end - 1.

Can I remove elements based on a condition?

Yes, you can use the remove_if algorithm from the <algorithm> header to remove elements based on a condition, followed by erase to actually remove them from the vector.

Can you show me an example of using remove_if?

Sure! Here's an example: vec.erase(std::remove_if(vec.begin(), vec.end(), [](int x) { return x < 0; }), vec.end()); This removes all negative numbers from the vector.