c 2b 2b set element at index

1std::set<int> my_set;
2//inserting element in set
3my_set.insert(5);
4my_set.insert(15);
5my_set.insert(10);
6my_set.insert(7);
7
8//accessing nth element form set
9int x = *std::next(my_set.begin(), n);