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DescriptionThere are eight planets and one planetoid in the Solar system. It is not a well known fact that there is a secret planet S4... 阅读全文
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Volodya is an odd boy and his taste is strange as well. It seems to him that a positive integer number is beautiful if and only if it ... 阅读全文
摘要：
Problem Description 单身! 依然单身！ 吉哥依然单身！ DS级码农吉哥依然单身！ 所以，他生平最恨情人节，不管是214还是77，他都讨厌！ 吉哥观察了214和77这两个数，发现： 2+1+4=7 7+7=7*2 77=7*11... 阅读全文