Compilare: user.cpp: In function ‘void insert(Trie*, char*)’: user.cpp:17:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(nod->fii[*s]==0){ ^ user.cpp:19:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] nod->fii[*s]=new Trie; ^ user.cpp:21:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] insert(nod->fii[*s],s+1); ^ user.cpp: In function ‘void del(Trie*, char*)’: user.cpp:29:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] del(nod->fii[*s],s+1); ^ user.cpp:36:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] nod->fii[*s]=0; ^ user.cpp: In function ‘int print_word(Trie*, char*, int)’: user.cpp:50:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(nod->fii[*s]==0) ^ user.cpp:52:38: warning: array subscript has type ‘char’ [-Wchar-subscripts] return print_word(nod->fii[*s],s+1,niv+1); ^ user.cpp: In function ‘int print_prefix(Trie*, char*, int)’: user.cpp:58:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] if((*s)==-1||nod->fii[*s]==0) ^ user.cpp:61:40: warning: array subscript has type ‘char’ [-Wchar-subscripts] return print_prefix(nod->fii[*s],s+1,niv+1); ^