Compilare: main.cpp: In function 'int main()': main.cpp:26:11: warning: array subscript has type 'char' [-Wchar-subscripts] 26 | F[c]=!F[c]; | ^ main.cpp:26:17: warning: array subscript has type 'char' [-Wchar-subscripts] 26 | F[c]=!F[c]; | ^ main.cpp: In function 'int factor()': main.cpp:71:20: warning: array subscript has type 'char' [-Wchar-subscripts] 71 | return F[ t[i++] ]; | ~~~~~^