Compilare: user.cpp: In function ‘int compare(std::string, std::string)’: user.cpp:16:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(d[a[i]]<d[b[i]])return 1; ^ user.cpp:16:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(d[a[i]]<d[b[i]])return 1; ^ user.cpp:17:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] else if(d[a[i]]>d[b[i]])return 0; ^ user.cpp:17:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] else if(d[a[i]]>d[b[i]])return 0; ^