Compilare: user.cpp: In function ‘int main()’: user.cpp:23:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(cod[x[i]] && (cod[x[i]] != y[i])) ^ user.cpp:23:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(cod[x[i]] && (cod[x[i]] != y[i])) ^ user.cpp:26:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] cod[x[i]] = y[i]; ^ user.cpp:36:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(cod[c]) ^ user.cpp:37:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] out << c << ' ' << cod[c] << '\n'; ^