Compilare: user.cpp: In member function ‘bool comp::operator()(std::string, std::string)’: user.cpp:19:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] return dist[x[0]] < dist[y[0]]; ^ user.cpp:19:38: warning: array subscript has type ‘char’ [-Wchar-subscripts] return dist[x[0]] < dist[y[0]]; ^ user.cpp: In function ‘void read()’: user.cpp:51:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i=0; i < sortare.size() ; i++) ^ user.cpp:52:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] dist[sortare[i]] = sortare[i] - 'a'; ^