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You are given agraph with n nodes and m directed edges. One lowercase letter is assigned to each node. We define a path'svalue as the number of the mo 阅读全文
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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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考虑具有N（1 <= N <= 20,000）个节点的树T，其编号为1 ... N. 从树中删除任何节点会生成一个林：一个或多个树的集合。将节点的余额定义为通过从T中删除该节点而创建的林T中最大树的大小。 例如，考虑树： 删除节点4会生成两个树，其成员节点为{5}和{1,2,3,6,7}。这两棵树中 阅读全文
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Problem Description Dandelion's uncle is a boss of a factory. As the spring festival is coming , he wants to distribute rewards to his workers. Now he 阅读全文
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Problem Description 众所周知，度度熊喜欢各类体育活动。今天，它终于当上了梦寐以求的体育课老师。第一次课上，它发现一个有趣的事情。在上课之前，所有同学要排成一列， 假设最开始每个人有一个唯一的ID，从1到N，在排好队之后，每个同学会找出包括自己在内的前方所有同学的最小ID，作为自己 阅读全文