Compilare: user.cpp: In function ‘void Solve()’: user.cpp:34:17: warning: unused variable ‘val’ [-Wunused-variable] int val = dq.back().first; ^~~ user.cpp:44:13: warning: unused variable ‘val’ [-Wunused-variable] int val = dq.back().first; ^~~ user.cpp:55:17: warning: unused variable ‘val’ [-Wunused-variable] int val = dq.back().first; ^~~ user.cpp:65:13: warning: unused variable ‘val’ [-Wunused-variable] int val = dq.back().first; ^~~