Compilare: user.cpp: In function ‘bool comparePoints(Point, Point)’: user.cpp:19:38: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] return p1.X < p2.X || p1.X==p2.X && p1.Y < p2.Y; ^ user.cpp: In function ‘int main()’: user.cpp:45:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 2; i < points.size(); i++) { ^ user.cpp:52:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < hull.size(); i++) { ^