스택 https://www.acmicpc.net/problem/17298 큐, 덱 https://www.acmicpc.net/problem/18258 https://www.acmicpc.net/problem/2164 https://www.acmicpc.net/problem/11866 https://www.acmicpc.net/problem/1966 https://www.acmicpc.net/problem/10866 덱
