Compilare: user.cpp: In function ‘int main()’: user.cpp:21:13: warning: unused variable ‘q’ [-Wunused-variable] int q=dq.back().first; ^ user.cpp:22:13: warning: unused variable ‘w’ [-Wunused-variable] int w=dq.back().second;} ^ user.cpp:36:13: warning: unused variable ‘q’ [-Wunused-variable] int q=dq.back().first; ^ user.cpp:37:13: warning: unused variable ‘w’ [-Wunused-variable] int w=dq.back().second;} ^