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liuqy

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$f_t=\sum\limits_{i=0}^{n-1}{n\choose i}(-1)^{n-1-i}\frac{i^{t-1}(n-i)}{n^t}$

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Virtual Participations：1 contest

Name	Start time
Public NOIP Round #1 (Div. 1, 提高)	2022-10-26 07:54:52