Compilare: user.cpp: In member function 'void Trie::add_word(std::string)': user.cpp:74: warning: array subscript has type 'char' user.cpp:75: warning: array subscript has type 'char' user.cpp:80: warning: array subscript has type 'char' user.cpp: In member function 'int AC::process_character(int&, char)': user.cpp:217: warning: array subscript has type 'char' user.cpp:219: warning: array subscript has type 'char' user.cpp: In member function 'int AC::process_string()': user.cpp:229: warning: array subscript has type 'char' user.cpp:231: warning: array subscript has type 'char' user.cpp:225: warning: unused variable 'op' user.cpp: In function 'int main()': user.cpp:303: warning: array subscript has type 'char' user.cpp:305: warning: array subscript has type 'char' user.cpp:264: warning: unused variable 'j' user.cpp:264: warning: unused variable 'k' /tmp/cctULU6m.o: In function `main': user.cpp:(.text+0x180): warning: the `gets' function is dangerous and should not be used.