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:19:36: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(alph[b.o[i]]<alph[a.o[i]]) ^ user.cpp: In function ‘int main()’: user.cpp:50:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] alph[init[i]]=i+1; ^ user.cpp:46:15: warning: variable ‘nr’ set but not used [-Wunused-but-set-variable] int p,n,i,nr; ^~ user.cpp: In function ‘bool crt(alphabet, alphabet)’: user.cpp:24:1: warning: control reaches end of non-void function [-Wreturn-type] } ^