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A number that will be the same when it is written forwards or backwards is known as a Palindromic Number. For example, 1234321 is a palindromic number... 阅读全文
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There is a public bike service in Hangzhou City which provides great convenience to the tourists from all over the world. One may rent a bike at any s... 阅读全文
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http://arena.acmclub.com/problem.php?id=26850数码世界的国王Shoutmon想要在n个小岛上举办一个游戏，来让数码宝贝们好好玩耍。背景是这样的：在这n个小岛之间事先安放了一些单向通道，每个通道连接两个不同的小岛，且只能按一个给定的方向通过。数码宝贝每次由通... 阅读全文