Regular Union-Find practice one. #include <cmath> #include <cstdio> #include <climits> #include <vector> #include <iostream> #include <fstream> #include <algorithm> #include <unordered_set> #include <unor…

题目介绍: 输入一个简单无向图,求出图中连通块的数目. Input 输入的第一行包含两个整数n和m,n是图的顶点数,m是边数.1<=n<=1000,0<=m<=10000. 以下m行,每行是一个数对v y,表示存在边(v,y).顶点编号从1开始. Output 单独一行输出连通块的数目. Sample Input 5 3 1 2 1 3 2 4 Sample Output 2 思路: 利用广度搜索,计算广度搜索的次数即为结果. 具体代码如下: #include <iostre…

题意:求图中的连通块数,注意孤立的算自连通! 例如:6个顶点3条路径,其中路径为:1->2    4->5  1->3 那么有(1-2&&1->3) + (4->5) + (6) 共3个连通块! 解法:对每个节点宽搜! #include<iostream> #include<memory.h> #include<queue> using namespace std; ][]; ]; int N,M; int main(){…

题目描述: 输入一个简单无向图,求出图中连通块的数目 输入: 输入的第一行包含两个整数n和m,n是图的顶点数,m是边数.1<=n<=1000,0<=m<=10000. 以下m行,每行是一个数对v y,表示存在边(v,y).顶点编号从1开始. 题目分析: 利用深度优先搜索寻找连通块数,一趟深度优先搜索为一个连通块,深度优先搜索次数为块数. #include<iostream> #include<memory> using namespace std; cons…

Codeforces Round #485 (Div. 2) F. AND Graph 题目连接: http://codeforces.com/contest/987/problem/F Description You are given a set of size $m$ with integer elements between $0$ and $2^{n}-1$ inclusive. Let's build an undirected graph on these integers in…

转自: http://aredko.blogspot.com/2014/02/knowing-how-all-your-components-work.html In today's post we will try to cover very interesting and important topic: distributed system tracing. What it practically means is that we will try to trace the request…

Read problems statements in Mandarin Chineseand Russian. Problem Statement Chef has a undirected graph G. This graph consists of N vertices and M edges. Each vertex of the graph has an unique index from 1 to N, also each edge of the graph has an uniq…

Time Limit: 2 Seconds      Memory Limit: 65536 KB Edward has a permutation {a1, a2, … an}. He finds that if he connects each pair (ai, aj) such that i < j and ai > aj, he will get a graph. For example, if the permutation is {2, 3, 1, 4}, then 1 and…

不难想到,x有边连出的一定是 (2^n-1) ^ x 的一个子集,直接连子集复杂度是爆炸的...但是我们可以一个1一个1的消去,最后变成补集的一个子集. 但是必须当且仅当 至少有一个 a 等于 x 的时候, 可以直接dfs(all ^ x) ,否则直接消1连边... Discription You are given a set of size mm with integer elements between 00 and 2n−12n−1 inclusive. Let's build an u…

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…