Compilare: user.cpp: In function ‘int main()’: user.cpp:20:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(v[a[i]]!=b[i] && v[a[i]]!=0) ^ user.cpp:20:39: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(v[a[i]]!=b[i] && v[a[i]]!=0) ^ user.cpp:23:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] else v[a[i]]=b[i]; ^