Compilare: user.cpp: In function ‘node* GO(node*, char)’: user.cpp:40:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (it->next[c]) it->go[c] = it->next[c]; ^ user.cpp:40:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (it->next[c]) it->go[c] = it->next[c]; ^ user.cpp:40:44: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (it->next[c]) it->go[c] = it->next[c]; ^ user.cpp:41:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (it->go[c]) return it->go[c]; ^ user.cpp:41:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (it->go[c]) return it->go[c]; ^ user.cpp:43:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] it->go[c] = GO(getLink(it),c); ^ user.cpp:44:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] return it->go[c]; ^ user.cpp: In function ‘int main()’: user.cpp:73:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<H.size();i++){ ^