Compilare: user.cpp: In function ‘int main()’: user.cpp:21:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(v[a[i]]==0 || v[a[i]]==b[i]) ^ user.cpp:21:36: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(v[a[i]]==0 || v[a[i]]==b[i]) ^ user.cpp:22:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[a[i]]=b[i]; ^ user.cpp:11:9: warning: unused variable ‘x’ [-Wunused-variable] int x,n=0,i,f=0,j,ok=1; ^ user.cpp:11:17: warning: unused variable ‘f’ [-Wunused-variable] int x,n=0,i,f=0,j,ok=1; ^ user.cpp:11:21: warning: unused variable ‘j’ [-Wunused-variable] int x,n=0,i,f=0,j,ok=1; ^