原文链接http://www.cnblogs.com/zhouzhendong/p/8326021.html 题目传送门 - POJ1459 题意概括 多组数据. 对于每一组数据,首先一个数n,表示有n个保安(n=0时输入结束). 接下来分别描述n个保安的信息. 对于每一个保安,首先两个整数K,M,分别表示他的空余时间段数和他一天中的最多工作时间. 接下来K行,每行h1:m1 h2:m2格式输入两个时间点,表示他从h1:m1时刻到h2:m2时刻是空余的. 现在我们要安排保安. 保安的开始工作和结…

Power Network Time Limit: 2000MS   Memory Limit: 32768K Total Submissions: 22987   Accepted: 12039 Description A power network consists of nodes (power stations, consumers and dispatchers) connected by power transport lines. A node u may be supplied…

https://vjudge.net/problem/POJ-1459 题解转载自:優YoU http://user.qzone.qq.com/289065406/blog/1299339754 解题思路 多源多汇最大流问题 题目给出很多都是废话,特别是符号s(u),d(u),Con还有那条公式都别管,混淆视听 难点在于构图 电站p(u)均为源点,用户c(u)均为汇点,中转站当普通点处理 第一个误区是例图, 结点 和 边 都有x/y(流量和容量),这个很容易使人产生矛盾(因为学习最大流问题是,只…

题目链接:https://vjudge.net/problem/POJ-1459 Power Network Time Limit: 2000MS   Memory Limit: 32768K Total Submissions: 29270   Accepted: 15191 Description A power network consists of nodes (power stations, consumers and dispatchers) connected by power t…

                                     Power Network Time Limit: 2000MS   Memory Limit: 32768K Total Submissions: 27229   Accepted: 14151 Description A power network consists of nodes (power stations, consumers and dispatchers) connected by power trans…

Description A power network consists of nodes (power stations, consumers and dispatchers) connected by power transport lines. A node u may be supplied with an amount s(u) >= 0 of power, may produce an amount 0 <= p(u) <= p max(u) of power, may co…

Time Limit: 2000MS   Memory Limit: 32768K Total Submissions: 20754   Accepted: 10872 Description A power network consists of nodes (power stations, consumers and dispatchers) connected by power transport lines. A node u may be supplied with an amount…

原题链接 题意简述 原题看了好几遍才看懂- 给出一个个点,条边的有向图.个点中有个源点,个汇点,每个源点和汇点都有流出上限和流入上限.求最大流. 题解 建一个真 · 源点和一个真 · 汇点.真 · 源点向所有原源点连容量等于其上限的边,所有原汇点向真 · 汇点连容量等于其上限的边.跑一遍最大流即可. Code //Power Network #include <cstdio> #include <cstring> #include <algorithm> using n…

解题报告 这题建模实在是好建.,,好贱.., 给前向星给跪了,纯dinic的前向星居然TLE,sad.,,回头看看优化,.. 矩阵跑过了.2A,sad,,, /************************************************************************* > File Name: PowerN.cpp > Author: _nplus > Mail: jun18753370216@gmail.com > Time: 2014年07…

读题比做题难系列…… poj1087 输入n,代表插座个数,接下来分别输入n个插座,字母表示.把插座看做最大流源点,连接到一个点做最大源点,流量为1. 输入m,代表电器个数,接下来分别输入m个电器,字符串表示.把电器看做最大流终点,连接到一个点做最大汇点,流量为1. 输入k,代表转换器个数,接下来分别输入k个转换器,每个插座输入两个字母a,b表示a可以连在b上.把转换器看做流,b->a,因为转换器无限提供,流量为无限大 代码: #include <iostream> #include &…

求从电站->调度站->消费者的最大流,给出一些边上的容量.和电站和消费者能够输入和输出的最大量. 加入一个超级源点和汇点,建边跑模板就能够了. 两个模板逗能够. #include <iostream> #include <cstring> #include <string> #include <cstdio> #include <cmath> #include <algorithm> #include <vector…

题目大意:一个网络,一共$n$个节点,$m$条边,$np$个发电站,$nc$个用户,$n-np-nc$个调度器,每条边有一个容量,每个发电站有一个最大负载,每一个用户也有一个最大接受量.问最多能供给多少电力. 解题关键:此题可转化为单元单汇最大流问题,设立一个超级源点和超级汇点,将超级源点指向所有源点,将所有汇点指向超级汇点,源点和汇点的点限制转化为连接边的容量限制. 此题输入格式有点坑,最好用cin #include<cstdio> #include<cstring> #incl…

题意:给出n,np,nc,m,n为节点数,np为发电站数,nc为用电厂数,m为边的个数.      接下来给出m个数据(u,v)z,表示w(u,v)允许传输的最大电力为z:np个数据(u)z,表示发电站的序号,以及最大的发电量:      nc个数据(u)z,表示用电厂的序号,以及最大的用电量.      最后让你求可以供整个网络使用的最大电力.思路:纯模板题.      这里主要是设一个源点s和一个汇点t,s与所有发电厂相连,边的最大容量为对应发电厂的最大发电量:      t与所有用电厂相连…

题目链接:http://poj.org/problem?id=1459 题意:有n个结点,np个发电站,nc个消费者,m个电力运输线.接下去是m条边的信息(u,v)cost,cost表示边(u,v)的最大流量:a个发电站的信息(u)cost,cost表示发电站u能提供的最大流量:b个用户的信息(v)cost,cost表示每个用户v能接受的最大流量. 思路:在图中添加1个源点S和汇点T,将S和每个发电站相连,边的权值是发电站能提供的最大流量:将每个用户和T相连,边的权值是每个用户能接受的最大流量.…

1.看了好久,囧. n个节点,np个源点,nc个汇点,m条边(对应代码中即节点u 到节点v 的最大流量为z) 求所有汇点的最大流. 2.多个源点,多个汇点的最大流. 建立一个超级源点.一个超级汇点,然后求超级源点到超级汇点的最大流即可. 3. 1.SAP邻接矩阵形式: /* SAP算法(矩阵形式) 结点编号从0开始 */ #include<iostream> #include<stdio.h> #include<string.h> using namespace std…

http://poj.org/problem?id=1459 题意:有np个发电站,nc个消费者,m条边,边有容量限制,发电站有产能上限,消费者有需求上限问最大流量. 思路:S和发电站相连,边权是产能上限,消费者和T相连,边权是需求上限,边的话就按题意加就好了.难点更觉得在于输入..加个空格..边数组要*2,因为有反向边. #include <cstdio> #include <algorithm> #include <iostream> #include <cs…

POJ 1459 Power Network / HIT 1228 Power Network / UVAlive 2760 Power Network / ZOJ 1734 Power Network / FZU 1161 (网络流,最大流) Description A power network consists of nodes (power stations, consumers and dispatchers) connected by power transport lines. A…

Power Network Time Limit: 2000MS   Memory Limit: 32768K Total Submissions: 31086   Accepted: 15986 题目链接:http://poj.org/problem?id=1459 Description: A power network consists of nodes (power stations, consumers and dispatchers) connected by power trans…

Power Network Time Limit: 2000MS   Memory Limit: 32768K Total Submissions: 24019   Accepted: 12540 Description A power network consists of nodes (power stations, consumers and dispatchers) connected by power transport lines. A node u may be supplied…

#include<cstdio> #include<cstring> #include<algorithm> #include<queue> #include<vector> #define INF 1e9 using namespace std; const int maxn=100+5; struct Edge { int from,to,cap,flow; Edge(){} Edge(int f,int t,int c,int fl):fr…

Power Network 时间限制: 1 Sec  内存限制: 128 MB 题目描述 A power network consists of nodes (power stations, consumers and dispatchers) connected by power transport lines. A node u may be supplied with an amount s(u) >= 0 of power, may produce an amount 0 <= p(u…

Power Network Time Limit: 2000MS   Memory Limit: 32768K Total Submissions: 27282   Accepted: 14179 Description A power network consists of nodes (power stations, consumers and dispatchers) connected by power transport lines. A node u may be supplied…

点击打开链接 Power Network Time Limit: 2000MS   Memory Limit: 32768K Total Submissions: 20903   Accepted: 10960 Description A power network consists of nodes (power stations, consumers and dispatchers) connected by power transport lines. A node u may be su…

Power Network Time Limit: 2000MS Memory Limit: 32768K Description A power network consists of nodes (power stations, consumers and dispatchers) connected by power transport lines. A node u may be supplied with an amount s(u) >= 0 of power, may produc…

Language: Default Power Network Time Limit: 2000MS   Memory Limit: 32768K Total Submissions: 23407   Accepted: 12267 Description A power network consists of nodes (power stations, consumers and dispatchers) connected by power transport lines. A node…

  Time Limit: 2000MS   Memory Limit: 32768K Total Submissions: 24788   Accepted: 12922 Description A power network consists of nodes (power stations, consumers and dispatchers) connected by power transport lines. A node u may be supplied with an amou…

Power Network Time Limit: 2000MS   Memory Limit: 32768K Total Submissions: 25414   Accepted: 13247 Description A power network consists of nodes (power stations, consumers and dispatchers) connected by power transport lines. A node u may be supplied…

Power Network Time Limit: 2000MS Memory Limit: 32768K Total Submissions: 24867 Accepted: 12958 Description A power network consists of nodes (power stations, consumers and dispatchers) connected by power transport lines. A node u may be supplied with…

题目连接 http://poj.org/problem?id=1459 Power Network Description A power network consists of nodes (power stations, consumers and dispatchers) connected by power transport lines. A node u may be supplied with an amount s(u) >= 0 of power, may produce an…

Power Network Time Limit: 2000MS   Memory Limit: 32768K Total Submissions: 25108   Accepted: 13077 Description A power network consists of nodes (power stations, consumers and dispatchers) connected by power transport lines. A node u may be supplied…