Compilare: user.cpp: In function ‘long double getArea(const std::vector<Point>&)’: user.cpp:28:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < P.size(); i++) Ar += fabs(Det(P[0], P[i - 1], P[i])); ^ user.cpp: In function ‘std::vector<Point> Reorder(const std::vector<Point>&)’: user.cpp:41:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = Pos; i < P.size(); i++) PP.push_back(P[i]); ^ user.cpp: In function ‘void Solve(std::vector<Point>&)’: user.cpp:86:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i++; i < P.size(); i++) Side2.push_back(P[i]); ^