Compilare: main.cpp: In function 'int main()': main.cpp:29:12: warning: array subscript has type 'char' [-Wchar-subscripts] 29 | f[msg[i]] ++; | ~~~~~^ main.cpp:58:18: warning: array subscript has type 'char' [-Wchar-subscripts] 58 | inv = 2 * (f[sh] + f[reverse(sh)]); | ^~ main.cpp:68:20: warning: array subscript has type 'char' [-Wchar-subscripts] 68 | x += inv - f[sh]; | ^~ main.cpp:70:20: warning: array subscript has type 'char' [-Wchar-subscripts] 70 | x += inv - f[osh]; | ^~~ main.cpp:74:14: warning: array subscript has type 'char' [-Wchar-subscripts] 74 | x += f[sh]; | ^~ main.cpp:76:14: warning: array subscript has type 'char' [-Wchar-subscripts] 76 | x += f[osh]; | ^~~