Compilare: user.cpp: In function ‘void down(trie*, const char*)’: user.cpp:42:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] const int fol = norm[*p]; ^ user.cpp: In function ‘void output()’: user.cpp:70:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^ user.cpp: In function ‘int main()’: user.cpp:92:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^