Not only is it basic, it's included in the C++ standard library (since '17): https://en.cppreference.com/w/cpp/algorithm/nth_element https://en.cppreference.co

Not only is it basic, it's included in the C++ standard library (since '17): https://en.cppreference.com/w/cpp/algorithm/nth_element https://en.cppreference.com/w/cpp/algorithm/nth_element