#include <set>
#include <iostream>
 
struct Point {
    int x, y;
};
 
int main() {
    auto comp = [](const Point& p1, const Point& p2) {
        return p1.x < p2.x || (p1.x == p2.x && p1.y < p2.y);
    };
    std::set<Point, decltype(comp)> mySet({ {2, 1}, {1, 2} }, comp);
 
    Point myPoint;
    myPoint.x = 1;
    myPoint.y = 3;
    mySet.insert(myPoint);
 
    for (auto const& pt : mySet) {
        std::cout << "(" << pt.x << ", " << pt.y << ")" << std::endl;
    }
 
	return 0;
}

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