Compilare: main.cpp: In function 'int stoint(std::__cxx11::string)': main.cpp:19:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size(); ++i) ~~^~~~~~~~~~ main.cpp: In function 'int Solve_1(std::__cxx11::string&)': main.cpp:31:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size(); ++i) ~~^~~~~~~~~~ main.cpp: In function 'void AddIngredient(std::__cxx11::string, int, std::vector<std::pair<std::__cxx11::basic_string<char>, int> >&)': main.cpp:66:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v.size(); ++i) ~~^~~~~~~~~~ main.cpp: In function 'std::vector<std::pair<std::__cxx11::basic_string<char>, int> > Solve_2(std::__cxx11::string&)': main.cpp:84:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size(); ++i) ~~^~~~~~~~~~ main.cpp: In function 'void Sort(std::vector<std::pair<std::__cxx11::basic_string<char>, int> >&)': main.cpp:113:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v.size() - 1; ++i) ~~^~~~~~~~~~~~~~ main.cpp: In function 'void Display(int, std::vector<std::pair<std::__cxx11::basic_string<char>, int> >)': main.cpp:128:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < output_2.size(); ++i) ~~^~~~~~~~~~~~~~~~~