Compilare: user.cpp: In function ‘void insert(trie*, char*)’: user.cpp:60:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (node -> children[H[*s]] == 0) ^ user.cpp:61:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] node -> children[H[*s]] = new trie(); ^ user.cpp:62:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] insert(node -> children[H[*s]], s + 1); ^