十年换你一句好久不见

摘要： 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

摘要： 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

摘要： 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

摘要： 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

摘要： &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

摘要： 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

摘要： 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

摘要： 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

摘要： 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

摘要： 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