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Description 一个数x各个数位上的数之积记为$f(x)$ 求[L,R)中满足$0 include include include include include define RG register define il inline define iter iterator define 阅读全文
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Description Given a string S. K string is the sub string of S and it appear in the S at least K times.It means there are at least K different pairs (i 阅读全文
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Description In middle school, teachers used to encourage us to pick up pretty sentences so that we could apply those sentences in our own articles. On 阅读全文
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Description Byteasar the gardener is growing a rare tree called Rotatus Informatikus. It has some interesting features: The tree consists of straight 阅读全文
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Description 永无乡包含 n 座岛,编号从 1 到 n,每座岛都有自己的独一无二的重要度,按照重要度可 以将这 n 座岛排名,名次用 1 到 n 来表示。某些岛之间由巨大的桥连接,通过桥可以从一个岛 到达另一个岛。如果从岛 a 出发经过若干座(含 0 座)桥可以到达岛 b,则称岛 a 和岛 阅读全文
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Description Now Coach Pang is preparing for the Graduate Record Examinations as George did in 2011. At each day, Coach Pang can: "+w": learn a word w 阅读全文