The Bottom of a Graph Time Limit : 6000/3000ms (Java/Other)   Memory Limit : 131072/65536K (Java/Other) Total Submission(s) : 1   Accepted Submission(s) : 1 Problem Description We will use the following (standard) definitions from graph theory. Let V…

题目大意:给你一张$n(n\leqslant5\times10^5)$个点$m(m\leqslant5\times10^5)$条边的有向图,有点权,给你起点和一些可能的终点.问从起点开始,到任意一个终点经过的点权和的最大值是多少. 题解:先把有向图缩点,然后从起点跑最长路,对每个终点取个最大值即可 卡点:求最长路写了$dijkstra$,然后死活调不出. C++ Code: #include <algorithm> #include <cstdio> #include <cc…

题目大意:给一张$n(n\leqslant2000)$个点的无向图,给所有边定向,使定向之后存在最多的有序点对$(a,b)$满足从$a$能到$b$ 题解:先把边双缩点,因为这里面的点一定两两可达. 根据网上题解得知,最优解一定长这样:存在一个点$s$,使得对于任意其他点$t$,要么$s$可以到$t$,要么$t$可以到$s$,就把$s$作为根.(出题人的题解也没给出解答,就感性理解) 所以$s$的每一个子树内的边要么都朝向$s$,要么都远离$s$ 然后可以枚举哪个点作为根,记$w_i$第$i$个双…

图论之强连通复习开始- - 题目大意:给你一个有向图,要你求出这样的点集:从这个点出发能到达的点,一定能回到这个点 思路:强连通分量里的显然都可以互相到达 那就一起考虑,缩点后如果一个点有出边,一定不在点集内,因为缩点后是DAG,无环,因此一定不能回到原来的点,所以找到出度为0的点即可 #include<cstdio> #include<string.h> #include<math.h> #include<algorithm> #include<io…

The Bottom of a Graph Time Limit: 3000MS   Memory Limit: 65536K Total Submissions: 9641   Accepted: 4008 Description We will use the following (standard) definitions from graph theory. Let V be a nonempty and finite set, its elements being called ver…

Problem Description Soda has a bipartite graph with n vertices and m undirected edges. Now he wants to make the graph become a complete bipartite graph with most edges by adding some extra edges. Soda needs you to tell him the maximum number of edges…

无向图缩块后,以n所在的块为根节点,dp找每块中的最大值. 对于每一个桥的答案为两块中的较小的最大值和较小的最大值加1 CRB and Graph Time Limit: 8000/4000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 113    Accepted Submission(s): 41 Problem Description A connected, undi…

Given a directed graph G, con- sider the following transformation. First, create a new graph T(G) to have the same vertex set as G. Cre- ate a directed edge between two vertices u and v in T(G) if and only if there is a path between u and v in G that…

强连通分量SCC 2-SAT 部分资料来自: 1.https://blog.csdn.net/whereisherofrom/article/details/79417926 2.https://baike.baidu.com/item/%E5%BC%BA%E8%BF%9E%E9%80%9A%E5%88%86%E9%87%8F/7448759?fr=aladdin 定义 在有向图G中,如果两个顶点vi,vj间(vi>vj)有一条从vi到vj的有向路径,同时还有一条从vj到vi的有向路径,则称两个…

论文信息 Title:<Symmetric Graph Convolutional Autoencoder for Unsupervised Graph Representation Learning> Authors:Jiwoong Park.Minsik Lee.H. Chang.Kyuewang Lee.J. Choi Sources:2019 IEEE/CVF International Conference on Computer Vision (ICCV) Paper:Downlo…

关于图计算&图学习的基础知识概览:前置知识点学习(Paddle Graph Learning (PGL)) 欢迎fork本项目原始链接:关于图计算&图学习的基础知识概览:前置知识点学习(Paddle Graph L)https://aistudio.baidu.com/aistudio/projectdetail/4982973?contributionType=1 因为篇幅关系就只放了部分程序在第三章,如有需求可自行fork项目原始链接. 0.1图计算基本概念 首先看到百度百科定义: 图…

TimeWall is a graph databases github It be used to apply mathematic model and social network with graph algorithms and so on... Features: 1. C/S structure 2. compute in memory 3. dynamic add and remove nodes on the graph db 4. with lots of algorithms…

Source: Connected Brain Figure above: Bullmore E, Sporns O. Complex brain networks: graph theoretical analysis of structural and functional systems.[J]. Nature Reviews Neuroscience, 2009, 10(3):186-198. Graph measures A graph G consisting of a set of…

Destroying The Graph Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 8198   Accepted: 2635   Special Judge Description Alice and Bob play the following game. First, Alice draws some directed graph with N vertices and M arcs. After that B…

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…

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 check whether these edges make up a valid tree. For example: Given n = 5 and edges = [[0, 1], [0, 2], [0, 3], [1, 4]], return tru…

Clone an undirected graph. Each node in the graph contains a label and a list of its neighbors. OJ's undirected graph serialization: Nodes are labeled uniquely. We use # as a separator for each node, and , as a separator for node label and each neigh…

Influence maximization on big social graph Fanju PPT链接: social influence booming of online social network 一, Application:viral marketing 1, identify influence customers: seeds. 2, convince them to adopter product. other application: Rumor monitoring…

关于zabbix的API见,zabbixAPI 1item批量添加 我是根据我这边的具体情况来做的,本来想在模板里面添加item,但是看了看API不支持,只是支持在host里面添加,所以我先在一个host里面添加,然后在将item全部移动到模板里. 具体步骤就不说了,直接上代码: 为了快速完成,代码写的有点乱,也没怎么处理异常,算是第一版吧,有时间在优化  1 #!/usr/bin/env python #-*- coding: utf- -*- import json import sys i…

Graph Structure Graph Definition theano's symbolic mathematical computation, which is composed of: Apply node: the application of an operator to some variable. Variable node: symbolic varibles. Op node: mathematical operation like: +,-,*,\,sqrt,sum,t…

作者:Vamei 出处:http://www.cnblogs.com/vamei 欢迎转载,也请保留这段声明.谢谢! 图(graph)是一种比较松散的数据结构.它有一些节点(vertice),在某些节点之间,由边(edge)相连.节点的概念在树中也出现过,我们通常在节点中储存数据.边表示两个节点之间的存在关系.在树中,我们用边来表示子节点和父节点的归属关系.树是一种特殊的图,但限制性更强一些. 这样的一种数据结构是很常见的.比如计算机网络,就是由许多节点(计算机或者路由器)以及节点之间的边(网线…

题目: Clone an undirected graph. Each node in the graph contains a label and a list of its neighbors. OJ's undirected graph serialization: Nodes are labeled uniquely. We use # as a separator for each node, and , as a separator for node label and each n…

转载:http://duanple.blog.163.com/blog/static/70971767201281610126277/   作者:Grzegorz Malewicz, Matthew H. Austern .etc.Google Inc 2010-6 原文:http://people.apache.org/~edwardyoon/documents/pregel.pdf 译者:phylips@bmy 2012-09-14 译文:http://duanple.blog.163.co…

<graph string='Sale Paid Grapg' type="pivot"> <field name='section_id' type="row"/> <field name='date' type="col"/> <field name='paid_amount' type="measure"/> </graph> graph type 指定默认图表…

Graph cuts是一种十分有用和流行的能量优化算法,在计算机视觉领域普遍应用于前背景分割(Image segmentation).立体视觉(stereo vision).抠图(Image matting)等. 此类方法把图像分割问题与图的最小割(min cut)问题相关联.首先用一个无向图G=<V,E>表示要分割的图像,V和E分别是顶点(vertex)和边(edge)的集合.此处的Graph和普通的Graph稍有不同.普通的图由顶点和边构成,如果边的有方向的,这样的图被则称为有向图,否则为…

一些知识点的初步理解_8(Graph Cuts,ing...) Graph cuts是一种十分有用和流行的能量优化算法,在计算机视觉领域普遍应用于前背景分割(Image segmentation).立体视觉(stereo vision).抠图(Image matting)等.Graph Cuts理论最早是出现在流网络优化领域的,比如说水管网络,通信传输网络,城市车流网络等.此时的Graph Cuts算法是用来确定网络流的最小分割,即寻找一个容量最小的边的集合,去掉这个集合中的所有边就可以阻挡这个…

My name is Charles Humble and I am here at QCon New York 2014 with Ian Robinson. Ian, can you introduce yourself to the InfoQ community? Hello, I am Ian Robinson, I am engineer at Neo Technology, I am based in London and I work on the Neo4j graph dat…

Learning CNNs for Arbitrary Graphs (Graph-like data): Learning Convolutional Neural Networks for Graphs Graph canonization: https://en.wikipedia.org/wiki/Graph_canonization Graph isomorphism https://en.wikipedia.org/wiki/Graph_isomorphism Bijection,…

2014年8月1日,经过很长时间的上网查阅资料,走了很多弯路,终于可以成功使用Graph工具仿真波形了,虽然这个的确很简单,但是经过自己摸索出来的,兴奋之情难于言表. 明天就是七夕了,刚和女朋友分手的我,有点小郁闷.不发牢骚了,最后一句,祝天下所有有缘人都是失散多年的兄妹. /***************************我是华丽的分割线君*******************************/ 1.连上仿真器,运行代码,在需要观察的地方打上断点.(这个就不细说了) 2.打开Gr…

// poj 1737 Connected Graph // // 题目大意: // // 带标号的连通分量计数 // // 解题思路: // // 设f(n)为连通图的数量,g(n)为非连通图的数量,h(n)为所有的 // 图的数量,h(n) = 2 ^(n * (n - 1) / 2); // f(n) + g[n] = h(n). // // 考虑标号为1在哪个连通分量内,设连通分量内有k个点,则问题为 // 在n-1个点中选择k-1个点的方法数 C(n-1,k-1),此时1所在的连通图数…