Compilare: user.cpp: In member function ‘int Hash_Function::hash_function(std::string&)’: user.cpp:80: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:238: warning: deprecated conversion from string constant to ‘char*’ user.cpp:239: warning: unused variable ‘h’ user.cpp: In member function ‘void Hash_Set<Data>::read_file(char*) [with Data = int]’: user.cpp:238: instantiated from here user.cpp:229: warning: unused variable ‘h’