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DescriptionThe French author Georges Perec (1936–1982) once wrote a book, La disparition, without the letter'e'. He was a member of the Oulipo group. ... 阅读全文
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Problem DescriptionVictor has a machine. When the machine starts up, it will pop out a ball immediately. After that, the machine will pop out a ball e... 阅读全文
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Problem DescriptionThe Czech Technical University is rather old — you already know that it celebrates 300 years of its existence in 2007. Some of the ... 阅读全文
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Problem Description经过锦囊相助，海东集团终于度过了危机，从此，HDU的发展就一直顺风顺水，到了2050年，集团已经相当规模了，据说进入了钱江肉丝经济开发区500强。这时候，XHD夫妇也退居了二线，并在风景秀美的诸暨市浬浦镇陶姚村买了个房子，开始安度晚年了。 这样住了一段时间，徐总... 阅读全文
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Problem Description某省自从实行了很多年的畅通工程计划后，终于修建了很多路。不过路多了也不好，每次要从一个城镇到另一个城镇时，都有许多种道路方案可以选择，而某些方案要比另一些方案行走的距离要短很多。这让行人很困扰。现在，已知起点和终点，请你计算出要从起点到终点，最短需要行走多少距离... 阅读全文
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DescriptionThe Game “Man Down 100 floors” is an famous and interesting game.You can enjoy the game fromhttp://hi.baidu.com/abcdxyzk/blog/item/16398781... 阅读全文
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Problem DescriptionConsider a positive integer X,and let S be the sum of all positive integer divisors of 2004^X. Your job is to determine S modulo 29... 阅读全文
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Problem DescriptionMr. Hdu is interested in Greatest Common Divisor (GCD). He wants to find more and more interesting things about GCD. Today He comes... 阅读全文
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Problem DescriptionA sequenceb1,b2,⋯,bnare called(d1,d2)-arithmetic sequence if and only if there existi(1≤i≤n)such that for everyj(1≤j 2 #include 3 #... 阅读全文
