Compilare: user.cpp: In function ‘int main()’: user.cpp:32:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < points.size(); i++) { ^ user.cpp:33:69: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if (points[p].X > points[i].X || points[p].X == points[i].X && points[p].Y>points[i].Y) { ^ user.cpp:45:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 3; 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++) { ^