Compilare: main.cpp: In function 'std::vector<Point> convex_hull(std::vector<Point>&)': main.cpp:37:27: warning: comparison of integer expressions of different signedness: 'std::vector<Point>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 37 | while(hull.size() > lower_size && cross(hull[hull.size() - 2], hull.back(), P) <= EPS) | ~~~~~~~~~~~~^~~~~~~~~~~~ main.cpp:43:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Point>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 43 | for(int i = 1; i < hull.size(); i++) | ~~^~~~~~~~~~~~~