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#-14081: iceysakura
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#-14081: ichan
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#-14081: Ichikaninomiku
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#-14081: icoder178
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#-14081: icpc_zhzx034
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#-14081: ICPCC
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#-14081: icpccamp2024-admin
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#-14081: icpccamp2024-team01
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orz Qingyu
#-14081: icpccamp2024-team28
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#-14081: icpccamp2025-team01
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#-14081: icpccamp2025-team14
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Tooo young tooo simple, sometimes naiiiive
#-14081: icpccamp2025-team15
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#-14081: icpccamp2025-team16
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#-14081: icpccamp2025-team17
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#-14081: icpccamp2025-team22
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#-14081: ICPCLive-s2
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#-14081: ICPCManager
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#-14081: icreiys
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#-14081: ICsmile
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#-14081: Icyecho
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#-14081: icyM1voya
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#-14081: icyo
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#-14081: idawnlight
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#-14081: IdealizedRomance
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$f_t=\sum\limits_{i=0}^{n-1}{n\choose i}(-1)^{n-1-i}\frac{i^{t-1}(n-i)}{n^t}$
#-14081: ideograph_advantage
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