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Perhaps the sea‘s definition of a shell is the pearl. However, in my view, a shell necklace with n beautiful shells contains the most sincere feeling 阅读全文
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There are well-known formulas: , , . Also mathematicians found similar formulas for higher degrees. Find the value of the sum modulo 109 + 7 (so you s 阅读全文
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Tiny Wong the chef used to be a mathematics teacher in a senior high school. At that time, he always used to tell his students that when there is a sq 阅读全文
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Let's call a non-empty sequence of positive integers a1, a2... ak coprime if the greatest common divisor of all elements of this sequence is equal to 阅读全文
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You are given n points on Cartesian plane. Every point is a lattice point (i. e. both of its coordinates are integers), and all points are distinct. Y 阅读全文
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Little Petya likes to draw. He drew N red and M blue points on the plane in such a way that no three points lie on the same line. Now he wonders what 阅读全文
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题意：给定N个点，用矩形将所有点覆盖，要求矩形宽度最小。 思路：裸体，旋转卡壳去rotate即可。 最远距离是点到点；宽度是点到边。 阅读全文
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You are given n points with integer coordinates on the plane. Points are given in a way such that there is no triangle, formed by any three of these n 阅读全文
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Given n distinct points on a plane, your task is to find the triangle that have the maximum area, whose vertices are from the given points. Input The 阅读全文
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Bessie, Farmer John's prize cow, has just won first place in a bovine beauty contest, earning the title 'Miss Cow World'. As a result, Bessie will mak 阅读全文