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#295: icpccamp2024-team05
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orz Qingyu
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#295: icpccamp2025-team01
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Tooo young tooo simple, sometimes naiiiive
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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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