Compilare: user.cpp: In function ‘void Insert(Trie*, char*)’: user.cpp:93:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(nod->son[*str]==0) ^ user.cpp:94:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] nod->son[*str]=new Trie; ^ user.cpp:95:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] Insert(nod->son[*str],str-1); ^ user.cpp: In function ‘bool Find(Trie*, char*)’: user.cpp:105:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(nod->son[*str]==0) ^ user.cpp:107:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] return Find(nod->son[*str],str+1); ^ user.cpp: In function ‘char nextch()’: user.cpp:14:29: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf,1,MAXBUF,fi); ^