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Maximum Multiple Problem DescriptionGiven an integer n, Chiaki would like to find three positive integers x, y and z such that: n=x+y+z, x∣n, y∣n, z∣n 阅读全文
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B:Battle Royale Battle Royale games are the current trend in video games and Gamers Concealed Punching Circles (GCPC) is the most popular game of them 阅读全文
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Vitaly works at the warehouse. The warehouse can be represented as a grid of n × m cells, each of which either is free or is occupied by a container. 阅读全文
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Description Michael喜欢滑雪百这并不奇怪， 因为滑雪的确很刺激。可是为了获得速度，滑的区域必须向下倾斜，而且当你滑到坡底，你不得不再次走上坡或者等待升降机来载你。Michael想知道载一个区域中最长底滑坡。区域由一个二维数组给出。数组的每个数字代表点的高度。下面是一个例子 1 2 阅读全文
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&运算 将两个数转化为二进制后，对应的位置上相同即取，通常取1，所以&通常情况下可以用来枚举子集 设x为表示集合的整数，那么这个整数有如下性质： x的子集整数y在数值上不会比x大。因为x的子集y只是保留了x某些位置上的1，所以y总可以加上一个非负的整数z等于x，相当于把没选的1补上。 根据这个性质可 阅读全文
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Problem Description Claire and her little friend, ykwd, are travelling in Shevchenko's Park! The park is beautiful - but large, indeed. N feature spot 阅读全文
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树上面最长简单路（无环），就是树的直径问题 解决办法 一开始任取一个点u进行搜索查找出距离点u最远距离的点v和长度 第二次dfs则从第一次中的v找出距离点v最远距离的点的路径长度 Cow Marathon Description After hearing about the epidemic of 阅读全文
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Since Sonya has just learned the basics of matrices, she decided to play with them a little bit. Sonya imagined a new type of matrices that she called 阅读全文
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Divisions David is a young boy and he loves numbers. Recently he learned how to divide two numbers.David divides the whole day. He is happy if the res 阅读全文
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D:Lift Problems On the ground floor (floor zero) of a large university building a number of students are wait- ing for a lift. Normally, the lift stop 阅读全文