Compilare: user.cpp: In function ‘void convexHull(std::vector<int>&, std::vector<int>&)’: user.cpp:79:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 2 ; i < v.size() ; ++ i) { ^ user.cpp: In function ‘long long int Area(std::vector<int>)’: user.cpp:106:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i + 1 < v.size() ; ++ i) ^ user.cpp: In function ‘std::string getAnsString(std::vector<int>*)’: user.cpp:113:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0 ; j < inf[i].size() ; ++ j) ^