Compilare: user.cpp: In function ‘double Area(std::vector<std::pair<double, double> >)’: user.cpp:18:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i(0) ; i < polygon.size() - 1 ; ++i) ^ user.cpp: In function ‘long long int Compute(long long int, point, point, point, point)’: user.cpp:67:1: warning: control reaches end of non-void function [-Wreturn-type] } ^