Compilare: user.cpp: In member function ‘void the_structure::do_chunk(int)’: user.cpp:32:13: warning: unused variable ‘delta’ [-Wunused-variable] const int delta = delta_chunks[ch]; ^ user.cpp: In member function ‘int the_structure::query(int)’: user.cpp:67:19: warning: control reaches end of non-void function [-Wreturn-type] return i; } } } }; ^