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hdu 1524 A Chess Game 博弈之,SG函数简单题
Problem Description Let's design a new chess game. There are N positions to hold M chesses in this game. Multiple chesses can be located in the same position. The positions are constituted as a topological graph, i.e. there are directed edges connecting so...
分类:其他好文   时间:2015-03-01 13:14:04    阅读次数:294
SDUTOJ 2498 AOE网上的关键路径 最短路spfa
Description     一个无环的有向图称为无环图(Directed Acyclic Graph),简称DAG图。     AOE(Activity On Edge)网:顾名思义,用边表示活动的网,当然它也是DAG。与AOV不同,活动都表示在了边上,如下图所示:                                           如上所示,共有11项活动(11条...
分类:其他好文   时间:2015-02-28 06:46:02    阅读次数:240
JavaSript中的正则表达式
正则表达式是对字符串操作的逻辑公式,表达了对字符串的一种过滤逻辑。 相对于.NET和Perl,JS对正则表达式的支持相当朴素,或者说JS的正则表达式是perl正则表达式的一个子集。一、正则表达式引擎:主流正则引擎分为3类:1、DFA(text-directed) 2、NFA(rege-direc.....
分类:编程语言   时间:2015-02-27 00:15:55    阅读次数:506
hdu 4635 强连通分量+缩点
http://acm.hdu.edu.cn/showproblem.php?pid=4635 Problem Description Give a simple directed graph with N nodes and M edges. Please tell me the maximum number of the edges you can add that the gr...
分类:其他好文   时间:2015-02-26 18:35:11    阅读次数:148
poj 2054 Color a Tree 据说是贪心
Bob is very interested in the data structure of a tree. A tree is a directed graph in which a special node is singled out, called the "root" of the tree, and there is a unique path from the root to each of the other nodes. Bob intends to color all the no...
分类:其他好文   时间:2015-02-06 21:55:57    阅读次数:221
拓扑排序
拓扑排序:对有向图的所有结点排序,使得每一条有向边(u,v)对应的u都排在v的前面。 如果图中存在有向环,则不存在拓扑排序,反之则存在。把不包含有向环的有向图称为有向无环图(Directed Acyclic Graph,DAG)。 //因为查找的是有向边(u,v),所以在放置u之前需要把比u偏序大的所有的v放置好。 //所以,所有元素的放置是从后往前放的。 //用到的vis数组,vis[u]=...
分类:编程语言   时间:2015-02-04 20:26:34    阅读次数:255
HDU 3549 Flow Problem (最大流)
链接:click here 题意:Network flow is a well-known difficult problem for ACMers. Given a graph, your task is to find out the maximum flow for the weighted directed graph. 翻译:网络流量是一个众所周知的难题ACMers。给定一个图,...
分类:其他好文   时间:2015-02-03 19:39:49    阅读次数:245
codeforces#285--C - Misha and Forest(拓扑排序变形)
C - Misha and Forest Time Limit:1000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u Submit Status Description Let's define a forest as a non-directed acyclic graph (also...
分类:编程语言   时间:2015-01-16 10:05:48    阅读次数:174
codeforce #501 c Misha and Forest
Let's define a forest as a non-directed acyclic graph (also without loops and parallel edges). One day Misha played with the forest consisting of n vertices. For each vertex v from 0 to n?-?1 he ...
分类:其他好文   时间:2015-01-13 15:58:19    阅读次数:211
(python)Graph_tools模块学习
使用之前需要先导入:from graph_tool.all import *1、 创建一个图有向图:g = Graph()无向图:ug = Graph(directed=False)或ug = Graph()ug.set_directed(False)2、 创建节点:v1 =g.add_vertex...
分类:编程语言   时间:2014-12-27 22:53:09    阅读次数:561
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