Compilare: main.cpp: In function 'std::vector<Point> convex_hull(std::vector<Point>&)': main.cpp:47:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Point>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 47 | for (int i = 0; i < pts.size(); i++) { | ~~^~~~~~~~~~~~ main.cpp:61:28: warning: comparison of integer expressions of different signedness: 'std::vector<Point>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 61 | while (hull.size() > lower_sz) { | ~~~~~~~~~~~~^~~~~~~~~~ main.cpp: In function 'bool is_visible(Point, Point)': main.cpp:94:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<Point> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 94 | for (int k = 0; k < obstacles.size(); k++) { | ~~^~~~~~~~~~~~~~~~~~ main.cpp:114:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Point>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 114 | for (int i = 1; i < pts.size(); i++) { | ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:207:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Point>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 207 | for (int i = 0; i < nodes.size(); i++) { | ~~^~~~~~~~~~~~~~