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4361: isn Description 给出一个长度为n的序列A(A1,A2...AN)。如果序列A不是非降的,你必须从中删去一个数, 这一操作,直到A非降为止。求有多少种不同的操作方案,答案模10^9+7。 给出一个长度为n的序列A(A1,A2...AN)。如果序列A不是非降的,你必须从中删去 阅读全文
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4428: [Nwerc2015]Debugging调试 Description Your fancy debugger will not help you in this matter. There are many ways in which code can produce different 阅读全文
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4425: [Nwerc2015]Assigning Workstations分配工作站 Description Penelope is part of the admin team of the newly built supercomputer. Her job is to assign wor 阅读全文