题意 给定一棵 \(n\) 个节点, \(m\) 条边的无向图,每个点有点权,有 \(q\) 个询问,每次询问若删去存在一个节点权值在 \([L,R]\) 范围外的边,剩下的图构成了多少个连通块(询问间相互独立). \(1\leq n,q \leq 10^5\) \(1\leq m \leq 2\times 10^5\) 思路 题目意思在简化一下,就是求连接两个点权在 \([L,R]\) 中的边和原图中的所有节点构成的连通块数. 对于两维的询问,在没有强制在线的情况下,可以考虑离线消维.我们把询…

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…

GCD Tree Time Limit: 5000/2500 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 415    Accepted Submission(s): 172 Problem Description Teacher Mai has a graph with n vertices numbered from 1 to n. For every edge(u,v),…

Box Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) [Problem Description] There are N boxes on the ground, which are labeled by numbers from 1 to N. The boxes are magical, the size of each one can be enlarged or r…

Tree Time Limit: 16000/8000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 920    Accepted Submission(s): 388 Problem Description You are given a tree with N nodes which are numbered by integers 1..N. Each node is a…

Happy King Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others)Total Submission(s): 821    Accepted Submission(s): 179 Problem Description There are n cities and n−1 roads in Byteland, and they form a tree. The citie…

题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=4010 题意; 先给你一棵树,有 \(4\) 种操作: 1.如果 \(x\) 和 \(y\) 不在同一棵树上则在\(x-y\)连边. 2.如果 \(x\) 和 \(y\) 在同一棵树上并且 \(x!=y\) 则把 \(x\) 换为树根并把 \(y\) 和 \(y\) 的父亲分离. 3.如果 \(x\) 和 \(y\) 在同一棵树上则 \(x\) 到 \(y\) 的路径上所有的点权值\(+w\). 4…

lca的做法还是非常明显的.简单粗暴, 只是不是正解.假设树是长链就会跪,直接变成O(n).. 最后跑的也挺快,出题人还是挺阳光的.. 动态树的解法也是听别人说能ac的.预计就是放在splay上剖分一下,做法还是比較复杂的.,, 来一发lca: #include <stdio.h> #include <iostream> #include <algorithm> #include <sstream> #include <stdlib.h> #in…

The LCIS on the Tree Time Limit: 6000/3000 MS (Java/Others)    Memory Limit: 65535/65535 K (Java/Others)Total Submission(s): 175    Accepted Submission(s): 40 Problem Description For a sequence S1, S2, ... , SN, and a pair of integers (i, j), if 1 <=…

375. Query on a tree Problem code: QTREE You are given a tree (an acyclic undirected connected graph) with N nodes, and edges numbered 1, 2, 3...N-1. We will ask you to perfrom some instructions of the following form: CHANGE i ti : change the cost of…