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Description"Fat and docile, big and dumb, they look so stupid, they aren't muchfun..." - Cows with Guns by Dana Lyons The cows want to... 阅读全文
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Problem Description电子科大本部食堂的饭卡有一种很诡异的设计，即在购买之前判断余额。如果购买一个商品之前，卡上的剩余金额大于或等于5元，就一定可以购买成功（即使购买后卡上余额为负），否则无法购买（即使金额足够）。所以大家都希望尽量使卡上的余额最少。某... 阅读全文
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Professor GukiZ doesn't accept string as they are. He likes to swap some letters in string to obtain a new one.GukiZ has strings a, b,... 阅读全文
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Problem DescriptionClairewd is a member of FBI. After several years concealing in BUPT, she intercepted some important messages and sh... 阅读全文
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Problem DescriptionIt is well known that AekdyCoin is good at string problems as well as number theory problems. When given a string s... 阅读全文
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DescriptionThe Genographic Project is a research partnership between IBM and The National Geographic Society that is analyzing DNA fro... 阅读全文
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DescriptionThe little cat is so famous, that many couples tramp over hill and dale to Byteland, and asked the little cat to give names... 阅读全文
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DescriptionGiven two strings a and b we define a*b to be their concatenation. For example, if a = "abc" and b = "def" then a*b = "abcd... 阅读全文
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题目描述There is a string A. The length of A is less than 1,000,000. I rewrite it again and again. Then I got a new string: AAAAAA...... N... 阅读全文
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Problem DescriptionThe French author Georges Perec (1936–1982) once wrote a book, La disparition, without the letter 'e'. He was a mem... 阅读全文