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;
}