Compilare: main.cpp: In function 'std::__cxx11::string get(std::__cxx11::string)': main.cpp:18:14: warning: array subscript has type 'char' [-Wchar-subscripts] if (!Val[it]) Val[it] = ++cnt; ^ main.cpp:18:23: warning: array subscript has type 'char' [-Wchar-subscripts] if (!Val[it]) Val[it] = ++cnt; ^ main.cpp:20:15: warning: array subscript has type 'char' [-Wchar-subscripts] c += (Val[it] + '0'); ^