Compilare: user.cpp: In function ‘void Add(Trie*, char*)’: user.cpp:36:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(nod->son[chr] == 0) ^ user.cpp:38:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] nod->son[chr] = new Trie; ^ user.cpp:42:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] Add(nod->son[chr],X+1); ^ user.cpp: In function ‘bool Delete(Trie*, char*)’: user.cpp:51:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(Delete(nod->son[chr],X+1)) ^ user.cpp:53:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] nod->son[chr] = 0; ^ user.cpp: In function ‘int Search(Trie*, char*)’: user.cpp:71:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(nod->son[chr]) ^ user.cpp:72:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] return Search(nod->son[chr],X+1); ^ user.cpp: In function ‘int Prefix(Trie*, char*, int)’: user.cpp:81:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(*X == '\0' || nod->son[chr] == 0) ^ user.cpp:84:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] return Prefix(nod->son[chr],X+1,k+1); ^