How do I remove an element from a std::vector in C++?

How do I remove an element from a std::vector in C++?

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

What if I want to remove all occurrences of a specific value?

You can use the remove algorithm from the <algorithm> header followed by erase. For example:

vec.erase(std::remove(vec.begin(), vec.end(), value), vec.end());

Can you explain how remove works in this context?

Sure! The remove function shifts all elements that are not equal to the specified value to the front of the vector and returns an iterator to the new end. The erase method then removes the unwanted elements.

Is there a way to remove elements based on a condition?

Yes, you can use std::remove_if along with erase. For 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.