Compilare: user.cpp: In function ‘int main()’: user.cpp:95:12: warning: unused variable ‘e’ [-Wunused-variable] int n, k, e; ^ user.cpp:28:23: warning: ‘deque’ may be used uninitialized in this function [-Wmaybe-uninitialized] return (deque->first == 0); ^ user.cpp:97:9: note: ‘deque’ was declared here Deque* deque; ^