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Doqe
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https://qoj.ac/contest/1668/problem/8714 https://qoj.ac/contest/1699/problem/8529 https://loj.ac/p/2834 https://www.cnblogs.com/alfalfa-w/p/17539285.html awa
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https://qoj.ac/contest/1668/problem/8714 https://qoj.ac/contest/1699/problem/8529 https://loj.ac/p/2834 https://www.cnblogs.com/alfalfa-w/p/17539285.html awa