Compilare: main.cpp: In function 'void memoi(char*, int&, int&)': main.cpp:14:23: warning: array subscript has type 'char' [-Wchar-subscripts] cost+=cor1[key]*cor2[i], ^ main.cpp: In function 'int main()': main.cpp:71:15: warning: variable 'it' set but not used [-Wunused-but-set-variable] for (auto it:M) ^~