题目: (我的题目很长,你忍一下--) 题目分析: 这道题目的体面比较复杂,先是讲了一下树是怎样的一个结构,并且告诉我们在这里,他是以什么样的一种方式描述一棵树的,就是通过描述每个节点的父节点是哪个(b数组),然后告诉我们要安排边权,使得树中的每个节点到根的距离都能如同p数组那样进行排序,然后叫我们输出对应每个点和他的父结点之间的边权即可. 题解: 首先这道题是一道非常经典的让我们判断能否构造一个数组,使得题干条件成立,如果不能输出-1: 既然这样的话,我们肯定要先分析什么情况下会输出-1,那么…

Big Christmas Tree Time Limit: 3000MS   Memory Limit: 131072K Total Submissions: 23387   Accepted: 5063 Description Christmas is coming to KCM city. Suby the loyal civilian in KCM city is preparing a big neat Christmas tree. The simple structure of t…

树形DP.... Tree of Tree Time Limit: 1 Second      Memory Limit: 32768 KB You're given a tree with weights of each node, you need to find the maximum subtree of specified size of this tree. Tree Definition A tree is a connected graph which contains no c…

E. Minimum spanning tree for each edge   Connected undirected weighted graph without self-loops and multiple edges is given. Graph contains n vertices and m edges. For each edge (u, v) find the minimal possible weight of the spanning tree that contai…

time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Connected undirected weighted graph without self-loops and multiple edges is given. Graph contains n vertices and m edges. For each edge (u,…

E. Minimum spanning tree for each edge time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Connected undirected weighted graph without self-loops and multiple edges is given. Graph contains n …

CRB and Tree Time Limit: 8000/4000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 2112    Accepted Submission(s): 635 Problem Description CRB has a tree, whose vertices are labeled by 1, 2, …, N. They are connected…

Problem Description You are given a tree with N nodes which are numbered by integers 1..N. Each node is associated with an integer as the weight. Your task is to deal with M operations of 4 types: 1.Delete an edge (x, y) from the tree, and then add a…

A Complete Tutorial on Tree Based Modeling from Scratch (in R & Python) MACHINE LEARNING PYTHON R   SHARE      MANISH SARASWAT, APRIL 12, 2016 / 52     Introduction Tree based learning algorithms are considered to be one of the best and mostly used s…

E. Minimum spanning tree for each edge 题目连接: http://www.codeforces.com/contest/609/problem/E Description Connected undirected weighted graph without self-loops and multiple edges is given. Graph contains n vertices and m edges. For each edge (u, v) f…