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After hearing about the epidemic of obesity in the USA, Farmer John wants his cows to get more exercise, so he has committed to create a bovine marath 阅读全文
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Alex doesn't like boredom. That's why whenever he gets bored, he comes up with games. One long winter evening he came up with a game and decided to pl 阅读全文
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Professor Dumbledore is helping Harry destroy the Horcruxes. He went to Gaunt Shack as he suspected a Horcrux to be present there. He saw Marvolo Gaun 阅读全文
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Paladin Manao caught the trail of the ancient Book of Evil in a swampy area. This area contains n settlements numbered from 1 to n. Moving through the 阅读全文
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A. Borya's Diagnosis It seems that Borya is seriously sick. He is going visit n doctors to find out the exact diagnosis. Each of the doctors needs the 阅读全文
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As you know, an undirected connected graph with n nodes and n - 1 edges is called a tree. You are given an integer d and a tree consisting of n nodes. 阅读全文
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In the evening Polycarp decided to analyze his today's travel expenses on public transport. The bus system in the capital of Berland is arranged in su 阅读全文
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A. Alex and broken contest One day Alex was creating a contest about his friends, but accidentally deleted it. Fortunately, all the problems were save 阅读全文
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Little X has n distinct integers: p1, p2, ..., pn. He wants to divide all of them into two sets A and B. The following two conditions must be satisfie 阅读全文
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A boy named Ayrat lives on planet AMI-1511. Each inhabitant of this planet has a talent. Specifically, Ayrat loves running, moreover, just running is 阅读全文