sort function descending c++

#include <iostream>
#include <algorithm>
#include <vector>

int main() {
    std::vector<int> vec = {5, 2, 9, 1, 5, 6};

    std::sort(vec.begin(), vec.end(), std::greater<int>());

    for (const auto& elem : vec) {
        std::cout << elem << " ";
    }

    return 0;
}