Compilare: user.cpp: In function ‘Trie* update(const string&)’: user.cpp:133:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] node->sons[son[word[i]]] = new Trie(); ^ user.cpp:134:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] } ^ user.cpp:136:38: warning: array subscript has type ‘char’ [-Wchar-subscripts] } ^ user.cpp: In function ‘void increase(int)’: user.cpp:144:52: warning: array subscript has type ‘char’ [-Wchar-subscripts] node = node->sons[son[text[index ++]]]; ^ user.cpp:145:45: warning: array subscript has type ‘char’ [-Wchar-subscripts] ++ node->count; ^ user.cpp: In function ‘int main()’: user.cpp:156:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] } ^ user.cpp:159:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] } ^