Compilare: user.cpp: In member function ‘int Hash_Function::hash_function(std::string&)’: user.cpp:79: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:156: warning: deprecated conversion from string constant to ‘char*’ user.cpp: In member function ‘void Hash_Set<Data>::operator<<(char*) [with Data = int]’: user.cpp:156: instantiated from here user.cpp:116: warning: unused variable ‘mod’ user.cpp: In member function ‘bool Hash_Set<Data>::operator+=(Data&) [with Data = int]’: user.cpp:133: instantiated from ‘void Hash_Set<Data>::operator<<(char*) [with Data = int]’ user.cpp:156: instantiated from here user.cpp:227: warning: unused variable ‘init’