데일리디벨롭

📚 문제 입력 출력 예제 입력 1 15 push_back 1 push_front 2 front back size empty pop_front pop_back pop_front size empty pop_back push_front 3 empty front예제 출력 1 2 1 2 0 2 1 -1 0 1 -1 0 3예제 입력 2 22 front back pop_front pop_back push_front 1 front pop_back push_back 2 back pop_front push_front 10 push_front 333 front back pop_back pop_back push_back 20 push_back 1234 front back pop_back pop_back예제 출력 2 -1 -1..