정답 개수:
0
틀린 개수:
10
실행 실패 개수:
5 front front size push_back 371 back
-1 -1 0 371
5 push_front 15 push_front 7 front pop_front push_front 42
7
7 7
7 push_front 788 pop_front pop_back front pop_back empty back
-1 -1 -1 1
788 -1 -1 -1 1 -1