Compilare: user.cpp: In member function ‘int hash_functions::Hash(std::string&)’: user.cpp:71: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:283: warning: comparison between signed and unsigned integer expressions user.cpp: In member function ‘bool Chaining_Hash<Type>::operator+=(Type&) [with Type = unsigned int]’: user.cpp:297: instantiated from here user.cpp:261: warning: comparison between signed and unsigned integer expressions user.cpp: In member function ‘void Chaining_Hash<Type>::operator-=(Type&) [with Type = unsigned int]’: user.cpp:297: instantiated from here user.cpp:249: warning: comparison between signed and unsigned integer expressions user.cpp:297: instantiated from here user.cpp:246: warning: unused variable ‘b’ user.cpp:247: warning: unused variable ‘a’ user.cpp: In member function ‘bool Chaining_Hash<Type>::operator==(Type&) [with Type = unsigned int]’: user.cpp:297: instantiated from here user.cpp:237: warning: comparison between signed and unsigned integer expressions user.cpp: In member function ‘bool Cuckoo_Hash<Type>::operator+=(Type&) [with Type = unsigned int]’: user.cpp:187: warning: control reaches end of non-void function