QOJ.ac

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qwq

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2544

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19

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$\displaystyle \sum_{i=1}^n [i,i+1,\cdots, i+k] \pmod{10^9+7}$

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Accepted problems:196 problems

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Tried problems:33 problems

38361068410281138213124442995304235054010401140594251456145624797533663166367652780002164621651216752168621687216892169421695217272189421896

Authored problems:0 problem

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Virtual Participations:17 contests