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题目链接：Happy Necklace HDU - 6030 华师男想为他的女朋友买一条项链。项链是由多个红色和蓝色珠子组成的单串。身为华师男他体贴地想要更加打动他的女朋友，他知道，只要这段珠子中任意取出长度为质数的一段，都满足红珠数不少于蓝珠数，她就会喜欢这条项链。现在，他想买一串纯正的有n个珠子 阅读全文
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Bi-shoe and Phi-shoe Bamboo Pole-vault is a massively popular sport in Xzhiland. And Master Phi-shoe is a very popular coach for his success. He needs 阅读全文
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The Embarrassed Cryptographer The young and very promising cryptographer Odd Even has implemented the security module of a large system with thousands 阅读全文
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Big Number Problem Description As we know, Big Number is always troublesome. But it's really important in our ACM. And today, your task is to write a 阅读全文