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原题：DescriptionLittle Lesha loves listening to music via his smartphone. But the smartphone doesn't have much memory, so Lesha listens to his favorite ... 阅读全文
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原题：Descriptionnparticipants of the competition were split intomteams in some manner so that each team has at least one participant. After the competit... 阅读全文
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原题：DescriptionYou probably have played the game "Throwing Balls into the Basket". It is a simple game. You have to throw a ball into a basket from a c... 阅读全文
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原题：DescriptionAs Harry Potter series is over, Harry has no job. Since he wants to make quick money, (he wants everything quick!) so he decided to rob ... 阅读全文
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原题;Description大家常常感慨，要做好一件事情真的不容易，确实，失败比成功容易多了！做好“一件”事情尚且不易，若想永远成功而总从不失败，那更是难上加难了，就像花钱总是比挣钱容易的道理一样。话虽这样说，我还是要告诉大家，要想失败到一定程度也是不容易的。比如，我高中的时候，就有一个神奇的女生，... 阅读全文
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原题:DescriptionTomorrow is contest day, Are you all ready?We have been training for 45 days, and all guys must be tired.But , you are so lucky comparin... 阅读全文
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原题：DescriptionGirls are clever and bright. In HDU every girl like math. Every girl like to solve math problem!Now tell you two nonnegative integer a a... 阅读全文
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原题：Description 小明对数的研究比较热爱，一谈到数，脑子里就涌现出好多数的问题，今天，小明想考考你对素数的认识。 问题是这样的：一个十进制数，如果是素数，而且它的各位数字和也是素数，则称之为“美素数”，如29，本身是素数，而且2+9 = 11也是素数，所以它是美素数。 给定一个区间... 阅读全文
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原题：DescriptionThere is a hill with n holes around. The holes are signed from 0 to n-1.A rabbit must hide in one of the holes. A wolf searches the rabb... 阅读全文
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原题：DescriptionSometimes some mathematical results are hard to believe. One of the common problems is the birthday paradox. Suppose you are in a party ... 阅读全文