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描述 Ural大学有N个职员，编号为1~N。他们有从属关系，也就是说他们的关系就像一棵以校长为根的树，父结点就是子结点的直接上司。每个职员有一个快乐指数。现在有个周年庆宴会，要求与会职员的快乐指数最大。但是，没有职员愿和直接上司一起与会。 输入格式第一行一个整数N。(1<=N<=3000) 接下来N行，第i+1行表示i号职员的快乐指数Ri。(-128<=Ri<=127) 接下来N-1行，每行

题目描述 Description学校实行学分制。每门的必修课都有固定的学分，同时还必须获得相应的选修课程学分。学校开设了N（N<300）门的选修课程，每个学生可选课程的数量M是给定的。学生选修了这M门课并考核通过就能获得相应的学分。　　在选修课程中，有些课程可以直接选修，有些课程需要一定的基础知识，必须在选了其它的一些课程的基础上才能选修。例如《Frontpage》必须在选修了《Windows操作基

You are given a tree consisting exactly of nnn vertices. Tree is a connected undirected graph with n−1n−1n−1 edges. Each vertex vvv of this tree has a value ava_vav​ assigned to it. Let dist(x,y)dist(...

Time Limit: 15000/5000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others) Problem Description Dr. Skywind and Dr. Walkoncloud are planning to hold the annual JLU Collegiate Programming Contest...

time limit per test : 2 seconds memory limit per test : 256 megabytes You are given a tree (an undirected connected acyclic graph) consisting of nnn vertices. You are playing a game on this tree. Init...