大意:给定无向图, 求补图的连通块数 bfs模拟即可, 这里用了map存图, set维护未划分的点集, 复杂度$O(nlog^2n)$, 用链表的话可以$O(n)$ #include <iostream> #include <algorithm> #include <cstdio> #include <set> #include <map> #include <queue> #define REP(i,a,n) for(int i=a…

https://codeforces.com/contest/920/problem/E https://www.luogu.org/problemnew/show/P3452 https://www.lydsy.com/JudgeOnline/problem.php?id=1098 CF貌似出了原题? 这几个都是一样的,输入输出都一样,就是读入一张图,要求补图的连通块个数以及各个连通块大小 可以这样搞:维护一个set表示所有当前没到过的点:一开始所有点加进去 取出set中任意点作为起始点并从s…

这个题目居然可以用线段树写,好震惊,如果不是在线段树专题肯定想不到,但是就算在线段树的专题里面,我也不太会怎么写. 这个题目大意是,给你n m n代表n个点,m代表m条边,然后就是m行,每行两个数字,一个u一个v. 这个意思是u和v不想连,然后问你这个n个点形成了多少个联通块. 思路大概是这样,首先随意枚举一个点,然后直接更新每一个点的值+1,先消除自己的影响,然后对于每一个和它连的点的值都-1 然后查找一个值大于0 的点,再继续循环这个过程,如果找不到了就推出这个循环. 这个复杂度我不太会算.…

E - Connected Components? 思路: 补图bfs,将未访问的点存进set里 代码: #include<bits/stdc++.h> using namespace std; #define ll long long #define pb push_back #define mem(a,b) memset(a,b,sizeof(a)) ; bool vis[N]; int head[N]; int a[N]; ,ans=; struct edge{ int to,next;…

Discription You are given an undirected graph consisting of n vertices and  edges. Instead of giving you the edges that exist in the graph, we give you m unordered pairs (x, y) such that there is no edge between x and y, and if some pair of vertices…

E. Connected Components? time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are given an undirected graph consisting of n vertices and  edges. Instead of giving you the edges that exist i…

E. Connected Components? You are given an undirected graph consisting of n vertices and edges. Instead of giving you the edges that exist in the graph, we give you m unordered pairs (x, y) such that there is no edge between x and y, and if some pair…

原题链接在这里:https://leetcode.com/problems/number-of-connected-components-in-an-undirected-graph/ 题目: Given n nodes labeled from 0 to n - 1 and a list of undirected edges (each edge is a pair of nodes), write a function to find the number of connected com…

Cyclic Components CodeForces - 977E You are given an undirected graph consisting of nn vertices and mm edges. Your task is to find the number of connected components which are cycles. Here are some definitions of graph theory. An undirected graph con…

原题链接在这里:https://leetcode.com/problems/number-of-connected-components-in-an-undirected-graph/ 题目: Given n nodes labeled from 0 to n - 1 and a list of undirected edges (each edge is a pair of nodes), write a function to find the number of connected com…

E. Connected Components? time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are given an undirected graph consisting of n vertices and edges. Instead of giving you the edges that exist in…

Given n nodes labeled from 0 to n - 1 and a list of undirected edges (each edge is a pair of nodes), write a function to find the number of connected components in an undirected graph. Example 1: 0          3 |          | 1 --- 2    4 Given n = 5 and…

Write a program to find the strongly connected components in a digraph. Format of functions: void StronglyConnectedComponents( Graph G, void (*visit)(Vertex V) ); where Graph is defined as the following: typedef struct VNode *PtrToVNode; struct VNode…

We will learn how to use withRouter() to inject params provided by React Router into connected components deep in the tree without passing them down all the way down as props. The app component itself does not really use filter. It just passes the fi…

Number of Connected Components in an Undirected Graph Given n nodes labeled from 0 to n - 1 and a list of undirected edges (each edge is a pair of nodes), write a function to find the number of connected components in an undirected graph. Example 1:…

Given n nodes labeled from 0 to n - 1 and a list of undirected edges (each edge is a pair of nodes), write a function to find the number of connected components in an undirected graph. Example 1: 0          3 |          | 1 --- 2    4 Given n = 5 and…

Write a function to count the number of connected components in a given graph. Format of functions: int CountConnectedComponents( LGraph Graph ); where LGraph is defined as the following: typedef struct AdjVNode *PtrToAdjVNode; struct AdjVNode{ Verte…

［抄题］: Given n nodes labeled from 0 to n - 1 and a list of undirected edges (each edge is a pair of nodes), write a function to find the number of connected components in an undirected graph. Example 1: Input: n = 5 and edges = [[0, 1], [1, 2], [3, 4]…

Given n nodes labeled from 0 to n - 1 and a list of undirected edges (each edge is a pair of nodes), write a function to find the number of connected components in an undirected graph. Example 1: Input: n = 5 and edges = [[0, 1], [1, 2], [3, 4]] 0 3…

Given n nodes labeled from 0 to n - 1 and a list of undirected edges (each edge is a pair of nodes), write a function to find the number of connected components in an undirected graph. Example 1: | | --- Given n = 5 and edges = [[0, 1], [1, 2], [3, 4…

spark最新版公布了.之前的版本号就已经集成了graphx,这个版本号还改了一些bug. 我做了简单測试,只是网上关于集群模式执行spark资料太少了,仅仅有关于EC2(见參考资料1)的.可是还非常旧,好多命令都有变化了.非常讨厌写安装类的博客不注明当前使用软件的版本号,这是常识好不好?! 我的平台配置: spark:0.9.1 scala:2.10.4 hadoop:1.0.4 jdk:1.7.0 master node:1 worker node:16 1. spark 0\.9\.1的部…

We already know of the large corporation where Polycarpus works as a system administrator. The computer network there consists of n computers and m cables that connect some pairs of computers. In other words, the computer network can be represented a…

Given n nodes labeled from 0 to n - 1 and a list of undirected edges (each edge is a pair of nodes), write a function to find the number of connected components in an undirected graph. Example 1: 0        3 |          | 1 --- 2    4 Given n = 5 and e…

292D - Connected Components D. Connected Components time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output We already know of the large corporation where Polycarpus works as a system administrato…

D. Connected Components 题意 现在有n个点,m条编号为1-m的无向边,给出k个询问,每个询问给出区间[l,r],让输出删除标号为l-r的边后还有几个连通块? 思路 去除编号为[l,r]的边后,只剩下了[1,l-1]&&[r+1,m]两部分. 我们维护一个前缀以及后缀并查集,询问的时候把这两部分的边合并一下,就可以求出连通块的个数. 精辟! 代码 #include<bits/stdc++.h> #include<vector> #include…

作者: 负雪明烛 id: fuxuemingzhu 个人博客:http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 并查集 日期 题目地址:https://leetcode-cn.com/problems/number-of-connected-components-in-an-undirected-graph/ 题目描述 Given n nodes labeled from 0 to n - 1 and a list of undirected edges (ea…

题目链接 题意 对给定的一张图,求其补图的联通块个数及大小. 思路 参考 ww140142. 维护一个链表,里面存放未归入到任何一个连通块中的点,即有必要从其开始进行拓展的点. 对于每个这样的点,从它开始进行 \(bfs\),将未被拓展到的点加入队列,并从链表中删除. 注意:写法上有一点要注意, 在处理完一整个连通块之后,记录下下一个连通块中的第一个点之后,再将最初的 \(src\) 从链表中删除.若一开始便删除,则会造成链表脱节. Code #include <bits/stdc++.h>…

题 OvO http://codeforces.com/contest/920/problem/E 解 模拟一遍…… 1.首先把所有数放到一个集合 s 中,并创建一个队列 que 2.然后每次随便取一个数,并且从集合中删除这个数,将这个数放入 que 3.取 que 首元素,记为 now,然后枚举集合 s,每次找到 s 中和 now 相连的元素 x,从 s 中删除元素 x,并且把 x 放入 que 中. 4.如果 s 不为空,回到步骤2 可见就是一个模拟,至于复杂度,计算如下. 由于每个数字只会…

Description 题库链接 给你一个 \(n\) 个点 \(m\) 条边的无向图,求其补图的连通块个数及各个连通块大小. \(1\leq n,m\leq 200000\) Solution 参考了 ww140142 的做法.题解也转自该博客. 每次枚举一个未处理过的点,然后从它开始宽搜出它所在的连通块: 具体是枚举它的所有原图的边,标记起来,枚举边之后再枚举所有的点,将未标记的点加入该连通块,并加入队列继续宽搜: 为了节约无用的枚举,我们还需要对所有点构建链表,将已经在某个块内的点删除:…

一.题目 二.题目链接 http://codeforces.com/contest/920/problem/E 三.题意 给定一个$N$和$M$.$N$表示有$N$个点,$M$表示,在一个$N$个点组成的无向完全图中,接下来的$M$条无向边不存在. 问你在这个图中有多少个连通分量,并且从小到大输出每个连通分量的顶点个数. 四.思路 求无向图的连通分量个数,只需要跑一边bfs就OK了.其实dfs也可以,只是太多的“函数压栈现场保护”浪费一丢丢时间而已,慢一点点,影响其实并不大. 要注意的是,无论跑…