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Description George took sticks of the same length and cut them randomly until all parts became at most 50 units long. Now he wants to return sticks to 阅读全文
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Description During his last sabbatical, professor M. A. Ya made a surprising discovery about the old Maya calendar. From an old knotted message, profe 阅读全文
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Description One measure of ``unsortedness'' in a sequence is the number of pairs of entries that are out of order with respect to each other. For inst 阅读全文
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Description Some people believe that there are three cycles in a person's life that start the day he or she is born. These three cycles are the physic 阅读全文
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Description Fred Mapper is considering purchasing some land in Louisiana to build his house on. In the process of investigating the land, he learned t 阅读全文
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Description Larry graduated this year and finally has a job. He's making a lot of money, but somehow never seems to have enough. Larry has decided tha 阅读全文
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Description How far can you make a stack of cards overhang a table? If you have one card, you can create a maximum overhang of half a card length. (We 阅读全文