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Problem Description Ms.Fang loves painting very much. She paints GFW(Great Funny Wall) every day. Every day before painting, sh... 阅读全文
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Problem Description Dima took up the biology of bacteria, as a result of his experiments, he invented k types of bacteria. Over... 阅读全文
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Problem Description The Old Frog King lives on the root of an infinite tree. According to the law, each node should connect to ... 阅读全文
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Problem Description Given a prime number C(1≤C≤2×105), and three integers k1, b1, k2 (1≤k1,k2,b1≤109). Please find all pairs (a... 阅读全文
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Problem Description A frog has just learned some number theory, and can't wait to show his ability to his girlfriend. Now the... 阅读全文
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Problem Description Consider the decimal presentation of an integer. Let's call a number d-magic if digit d appears in decimal ... 阅读全文
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昨天有事回家，在车站冻了半天，成功的感冒了。。。 早上 8 点多醒了想来实验室，有的头晕量了量体温，有点低烧，就决定再睡一会订好闹钟 10 点多再去实验室，结果一睡睡到快 1 点，打比赛成功的迟到了 1 个多小时。。。 出的第一个题是之前做过的一个区间 dp，... 阅读全文
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Problem Description Dima, Inna and Seryozha have gathered in a room. That's right, someone's got to go. To cheer Seryozha up an... 阅读全文
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Problem Description In some country there are exactly n cities and m bidirectional roads connecting the cities. Cities are numb... 阅读全文
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Problem Description Students in a class are making towers of blocks. Each student makes a (non-zero) tower by stacking pieces l... 阅读全文