Compilare: main.cpp: In member function 'void Trie::insert(std::__cxx11::string)': main.cpp:32:30: warning: array subscript has type 'char' [-Wchar-subscripts] if(curr->nxt[s[i]] == 0) { ^ main.cpp:33:31: warning: array subscript has type 'char' [-Wchar-subscripts] curr->nxt[s[i]] = new Node(); ^ main.cpp:35:34: warning: array subscript has type 'char' [-Wchar-subscripts] curr = curr->nxt[s[i]]; ^ main.cpp: In member function 'void Trie::count(std::__cxx11::string&, int, int)': main.cpp:47:30: warning: array subscript has type 'char' [-Wchar-subscripts] if(curr->nxt[s[i]] != 0) { ^ main.cpp:49:38: warning: array subscript has type 'char' [-Wchar-subscripts] curr = curr->nxt[s[i]]; ^