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劝君莫惜金缕衣 劝君惜取少年时
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2020牛客暑期多校训练营(第一场)J
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题目描述 Given , find the value of . It can be proved that the value is a rational number . Print the result as . 输入描述 The input consists of seve...
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2020-08-10
1
567