Compilare: user.cpp: In member function ‘bool cmp::operator()(std::pair<short int, char>, std::pair<short int, char>)’: user.cpp:25:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] return d[x.first][x.second] > d[y.first][y.second]; ^ user.cpp:25:58: warning: array subscript has type ‘char’ [-Wchar-subscripts] return d[x.first][x.second] > d[y.first][y.second]; ^ user.cpp: In function ‘int main()’: user.cpp:64:62: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(sir[j] >= '1' && sir[j] <= '9' && j < sir.size()) ^ user.cpp:72:62: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(sir[j] >= '1' && sir[j] <= '9' && j < sir.size()) ^ user.cpp:80:62: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(sir[j] >= '1' && sir[j] <= '9' && j < sir.size()) ^ user.cpp:105:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < v[nod].size(); i++) ^