Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 5934    Accepted Submission(s): 1845 Problem Description Coach Pang is interested in Fibonacci numbers while Uncle Yang wants him to do some resea…

hdu 5909 Tree Cutting 题意:一颗无根树,每个点有权值,连通子树的权值为异或和,求异或和为[0,m)的方案数 \(f[i][j]\)表示子树i中经过i的连通子树异或和为j的方案数 转移类似背包,可以用fwt加速 #include <iostream> #include <cstdio> #include <cstring> #include <algorithm> using namespace std; typedef long lon…

题目:http://acm.hdu.edu.cn/showproblem.php?pid=1102 /************************************************************************/ /* hdu Constructing Roads 最小生成树 题目大意:在N个村子中已经存在部分存在连通,建最少长度的路使得所有的村子连通. 解题思路:已经连通的村子其中间的路径作为0,即修建的时候修建为0耗费,求这些节点的最小生成树. */ /*…

HDU 5044 Tree field=problem&key=2014+ACM%2FICPC+Asia+Regional+Shanghai+Online&source=1&searchmode=source" target="_blank" style="">题目链接 就简单的树链剖分,只是坑要加输入外挂,还要手动扩栈 代码: #include <cstdio> #include <cstring>…

[HDU 5293]Tree chain problem(树形dp+树链剖分) 题面 在一棵树中,给出若干条链和链的权值,求选取不相交的链使得权值和最大. 分析 考虑树形dp,dp[x]表示以x为子树的最大权值和(选的链都在i的子树中) 设sum[x]表示x的儿子的dp值和,即\(\sum _{y \in \mathrm{son}(x)} dp[y]\) 1.不选两端点lca为x的链,dp[x]=sum[x] 2.选两端点lca为x的链,则dp[x]=max{链的权值+链上节点的所有子节点dp的…

Minimum Spanning Tree Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) [Problem Description] XXX is very interested in algorithm. After learning the Prim algorithm and Kruskal algorithm of minimum spanning tree, XXX…

Minimal Ratio Tree Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) [Problem Description] For a tree, which nodes and edges are all weighted, the ratio of it is calculated according to the following equation.Given a…

Fibonacci Tree 题目连接: http://acm.hdu.edu.cn/showproblem.php?pid=4786 Description Coach Pang is interested in Fibonacci numbers while Uncle Yang wants him to do some research on Spanning Tree. So Coach Pang decides to solve the following problem: Consi…

Tree Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 102400/102400 K (Java/Others) Total Submission(s): 1643    Accepted Submission(s): 461 Problem Description   Zero and One are good friends who always have fun with each other. This time, t…

给定一个无向图,如果他的某个子图中,任意两个顶点都能互相连通并且是一棵树,那么这棵树就叫做生成树(spanning tree). 如果边上有权值,那么使得边权和最小的生成树叫做最小生成树(MST,Minimum Spanning Tree).       1.prim版本的算法   .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", co…

Tree Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=4757 Description Zero and One are good friends who always have fun with each other. This time, they decide to do something on a tree which is a kind of graph…

Install Air Conditioning HDU - 4756 题意是要让n-1间宿舍和发电站相连 也就是连通嘛 最小生成树板子一套 但是还有个限制条件 就是其中有两个宿舍是不能连着的 要求所有情况中最大的那个 这是稠密图 用kruskal的时间会大大增加 所以先跑一遍prim 跑完之后对最小生成树里面的边去搜索(树形dp)我觉得dp就是搜索(虽然我菜到切不了dp题.) so dfs的过程我也叫做树形dp咯 dp[i][j]表示i和j不相连后 这两个部分距离最小的边 代码如下 #incl…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=6228 Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 262144/262144 K (Java/Others) Problem DescriptionConsider a un-rooted tree T which is not the biological significance of tree or plant, but a tre…

Tree Cutting 题目连接: http://acm.hdu.edu.cn/showproblem.php?pid=5909 Description Byteasar has a tree T with n vertices conveniently labeled with 1,2,...,n. Each vertex of the tree has an integer value vi. The value of a non-empty tree T is equal to v1⊕v…

[BZOJ1977][BeiJing2010组队]次小生成树 Tree Description 小 C 最近学了很多最小生成树的算法,Prim 算法.Kurskal 算法.消圈算法等等. 正当小 C 洋洋得意之时,小 P 又来泼小 C 冷水了.小 P 说,让小 C 求出一个无向图的次小生成树,而且这个次小生成树还得是严格次小的,也就是说: 如果最小生成树选择的边集是 EM,严格次小生成树选择的边集是 ES,那么需要满足:(value(e) 表示边 e的权值)  这下小 C 蒙了,他找到了你,希望…

题目链接:pid=4786" target="_blank">http://acm.hdu.edu.cn/showproblem.php?pid=4786 Problem Description Coach Pang is interested in Fibonacci numbers while Uncle Yang wants him to do some research on Spanning Tree. So Coach Pang decides to sol…

Tree Time Limit: 6000/2000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 1954    Accepted Submission(s): 573 Problem Description There are N (2<=N<=600) cities,each has a value of happiness,we consider two cities…

tree Time Limit: 8000ms Memory Limit: 262144KB This problem will be judged on HDU. Original ID: 539064-bit integer IO format: %I64d      Java class name: Main   Given a rooted tree(node 1 is the root) with n nodes. The ithnode has a positive value vi…

传送门 Tree Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 102400/102400 K (Java/Others) Problem Description   Zero and One are good friends who always have fun with each other. This time, they decide to do something on a tree which is a kind…

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…

题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=5293 题意: 给你一些链,每条链都有自己的价值,求不相交不重合的链能够组成的最大价值. 题解: 树形dp, 对于每条链u,v,w,我们只在lca(u,v)的顶点上处理它 让dp[i]表示以i为根的指数的最大值,sum[i]表示dp[vi]的和(vi为i的儿子们) 则i点有两种决策,一种是不选以i为lca的链,则dp[i]=sum[i]. 另一种是选一条以i为lca的链,那么有转移方程:dp[i]=…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=4757 题意:给出一棵树,节点有权值.每次询问x到y的路径上与z抑或的最大值. 思路:可持久化trie. struct Node { int c[2],cnt; }; Node a[2000005]; int cnt; int newNode() { cnt++; a[cnt].c[0]=a[cnt].c[1]=a[cnt].cnt=0; return cnt; } struct node { int…

tree 把每条边权是1的边断开,发现每个点离他最近的点个数就是他所在的连通块大小. 开一个并查集,每次读到边权是0的边就合并.最后Ans​i​​=size[findset(i)],size表示每个并查集根的size Ans_i=size[findset(i)],sizeAns​i​​=size[findset(i)],size表示每个并查集根的sizesize. #include<cstdio> #include<cstring> #include<algorithm>…

Tree Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://acm.hust.edu.cn/vjudge/contest/view.action?cid=93850#problem/F 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 w…

Problem Description There is a tree(the tree is a connected graph which contains n points and n−1 edges),the points are labeled from 1 to n,which edge has a weight from 0 to 1,for every point i∈[1,n],you should find the number of the points which are…

Problem Description         A binary tree is a finite set of vertices that is either empty or consists of a root r and two disjoint binary trees called the left and right subtrees. There are three most important ways in which the vertices of a binary…

Binary Tree Traversals Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 3340    Accepted Submission(s): 1500 Problem Description A binary tree is a finite set of vertices that is either empty or…

Problem Description The Head Elder of the tropical island of Lagrishan has a problem. A burst of foreign aid money was spent on extra roads between villages some years ago. But the jungle overtakes roads relentlessly, so the large road network is too…

Problem Description   Coco has a tree, whose vertices are conveniently labeled by 1,2,…,n.There are m chain on the tree, Each chain has a certain weight. Coco would like to pick out some chains any two of which do not share common vertices.Find out t…

题目链接 Problem Description There is a tree with n nodes, each of which has a type of color represented by an integer, where the color of node i is ci. The path between each two different nodes is unique, of which we define the value as the number of di…