摘要：一所学校不久前买了第一台电脑（所以这台电脑的ID是1）。近年来，学校购买了N-1新电脑。每台新电脑都连接到一台先前安装的电脑上。学校的管理人员担心网络运行缓慢，希望知道第i台计算机需要发送信号的最大距离si（即到最远计算机的电缆长度）。您需要提供此信息。 提示：示例输入与此图对应。从图中，你可以看到 阅读全文

摘要：Given a tree (a connected graph with no cycles), you have to find the farthest nodes in the tree. The edges of the tree are weighted and undirected. T 阅读全文

摘要：Building and maintaining roads among communities in the far North is an expensive business. With this in mind, the roads are build such that there is 阅读全文

摘要：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

摘要：The northern part of the Pyramid contains a very large and complicated labyrinth. The labyrinth is divided into square blocks, each of them either fil 阅读全文