Compilare: user.cpp: In function ‘void rezolva()’: user.cpp:29:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (!s.empty () && s.size () + n > m && s.top () < a) { ^ user.cpp:36:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (s.size () > m) s.pop (); ^ user.cpp:25:10: warning: unused variable ‘ok’ [-Wunused-variable] bool ok; ^