Compilare: user.cpp: In function ‘bool crt(alphabet, alphabet)’: user.cpp:19:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(alph[b.o[i]]!=alph[a.o[i]]) ^ user.cpp:19:37: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(alph[b.o[i]]!=alph[a.o[i]]) ^ user.cpp:20:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] return alph[b.o[i]]>alph[a.o[i]]; ^ user.cpp:20:44: warning: array subscript has type ‘char’ [-Wchar-subscripts] return alph[b.o[i]]>alph[a.o[i]]; ^ user.cpp: In function ‘int main()’: user.cpp:47:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] alph[init[i]]=i+1; ^ user.cpp:43:15: warning: variable ‘nr’ set but not used [-Wunused-but-set-variable] int p,n,i,nr; ^~