Compilare: user.cpp: In function ‘long long int freq(long long int, long long int)’: user.cpp:43:42: warning: array subscript has type ‘char’ [-Wchar-subscripts] long long lng=n,frlit=fr[s[(poz-1)%n]],frcaps=fr[caps(s[(poz-1)%n])],auxlit,auxcaps; ^ user.cpp:43:72: warning: array subscript has type ‘char’ [-Wchar-subscripts] long long lng=n,frlit=fr[s[(poz-1)%n]],frcaps=fr[caps(s[(poz-1)%n])],auxlit,auxcaps; ^ user.cpp: In function ‘int main()’: user.cpp:68:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(auto c:s)++fr[c]; ^