Compilare: user.cpp: In function ‘std::vector<int> Jarvis(std::vector<std::pair<double, double> >&)’: user.cpp:30:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < v.size(); i++) ^ user.cpp:41:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v.size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:65:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < hull.size(); i++) ^