Compilare: user.cpp: In member function ‘void mypq::clear()’: user.cpp:69:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(cur < v.size() && v[cur].empty()){ ^ user.cpp: In member function ‘bool mypq::empty()’: user.cpp:79:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return cur == v.size(); } ^