Compilare: main.cpp: In function 'int main()': main.cpp:14:17: warning: array subscript has type 'char' [-Wchar-subscripts] if(sir[i]>='a' && sir[i]<='z') lit[sir[i]-'a']++; ^ main.cpp:14:32: warning: array subscript has type 'char' [-Wchar-subscripts] if(sir[i]>='a' && sir[i]<='z') lit[sir[i]-'a']++; ^ main.cpp:14:51: warning: array subscript has type 'char' [-Wchar-subscripts] if(sir[i]>='a' && sir[i]<='z') lit[sir[i]-'a']++; ^ main.cpp:16:17: warning: array subscript has type 'char' [-Wchar-subscripts] if(lit[i]) ^ main.cpp:19:39: warning: array subscript has type 'char' [-Wchar-subscripts] fout << ch << " " << lit[i] << "\n"; ^