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
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