Compilare: user.cpp: In function ‘int main()’: user.cpp:35:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<h.size();++i) ^ user.cpp: In function ‘bool comparePoints(Point, Point)’: user.cpp:53:33: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] return (a.x<b.x)||(a.x==b.x)&&(a.y<b.y); ^ user.cpp: In function ‘void ConvexHull()’: user.cpp:66:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=2;i<v.size();++i) ^