#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…
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…
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: 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…
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…
Power Network Time Limit: 2000MS   Memory Limit: 32768K Total Submissions: 25514   Accepted: 13287 Description A power network consists of nodes (power stations, consumers and dispatchers) connected by power transport lines. A node u may be supplied…
题目链接: http://poj.org/problem?id=1459 因为发电站有多个,所以需要一个超级源点,消费者有多个,需要一个超级汇点,这样超级源点到发电站的权值就是发电站的容量,也就是题目中的pmax,消费者到超级汇点的权值就是消费者的容量,也就是题目中的cmax.初学网络流,第一眼看到这个题还以为应该先做一遍EK算法,然后减去max(p-pmax, c-cmax)呢..没想到这个题的难点就是建图而已.. #include <stdio.h> #include <string…
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…
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…
<题目链接> 题目大意:给出 n 个点,其中包括 np个发电站,nc 个消费者, 剩下的全部都是中转点,再给出 这些点中的m 条边,代表这两点间的最大传输电量,并且给出发电站的最大发送电量,以及消费者的最大承受电量,求所有消费者所能得到的最大电量. 解题分析:本题发电站可以看成源点,消费者看成汇点,由于可能有多个源点和汇点,因此我们可以建立一个超级源点和超级汇点,超级源点与所有发电站直接相连,容量为每个发电站的最大容量,超级汇点与所有消费者相连,容量为每个消费者的最大容量. #include…
题目:http://poj.org/problem?id=1459 题意:有一些发电站,消耗用户和中间线路,求最大流.. 加一个源点,再加一个汇点.. 其实,过程还是不大理解.. #include <iostream> #include <cstdio> #include <cstring> #include <algorithm> #include <queue> using namespace std; <<; ][],flow[…
不可以理解的是,测评站上的0ms是怎么搞出来的. 这一题在建立超级源点和超级汇点后就变得温和可爱了.其实它本身就温和可爱.对比了能够找到的题解: (1)艾德蒙·卡普算法(2)迪尼克算法(3)改进版艾德蒙·卡普算法(MY METHOD) 不去管那个0ms的吧,那么(3)号算法最为美妙[它的别名是:ISAP],时间可观. 这个就算是一个ISAP的模板吧(除了输入的难看的几行外,其余均是标准的大米饼牌模板!) #include<stdio.h> #include<algorithm> #…
题目链接:http://poj.org/problem?id=1459 解题报告: 电力调度站不涉及流的产生和消耗,不用考虑,Edmonds-Karp算法,就是利用剩余网络和增广路来解决,网络中的最大流. 原理:剩余网络,就是一种回退,构造完在剩余网络后,在剩余网络中找一条增广路,其中的最小流量,每个边加上这个最小流量或者减去这个最小流量,那么流就变成最大的了. 在加上或者减去这个最小流量时,初始化flow[][]这个剩余网络为0,最小流量node[v]=min(node[u],cap[u][v…
Description Cows are such finicky eaters. Each cow has a preference for certain foods and drinks, and she will consume no others. Farmer John has cooked fabulous meals for his cows, but he forgot to check his menu against their preferences. Although…
Sightseeing tour Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 8628   Accepted: 3636 Description The city executive board in Lund wants to construct a sightseeing tour by bus in Lund, so that tourists can see every corner of the beauti…
Description On a grid map there are n little men and n houses. In each unit time, every little man can move one unit step, either horizontally, or vertically, to an adjacent point. For each little man, you need to pay a $1 travel fee for every step h…
Description Dearboy, a goods victualer, now comes to a big problem, and he needs your help. In his sale area there are N shopkeepers (marked from 1 to N) which stocks goods from him.Dearboy has M supply places (marked from 1 to M), each provides K di…
Description Alice, a charming girl, have been dreaming of being a movie star for long. Her chances will come now, for several filmmaking companies invite her to play the chief role in their new films. Unfortunately, all these companies will start mak…
Description Jamie is a very popular girl and has quite a lot of friends, so she always keeps a very long contact list in her cell phone. The contact list has become so long that it often takes a long time for her to browse through the whole list to f…
Description FJ's cows really hate getting wet so much that the mere thought of getting caught in the rain makes them shake in their hooves. They have decided to put a rain siren on the farm to let them know when rain is approaching. They intend to cr…
链接 Description Every time it rains on Farmer John's fields, a pond forms over Bessie's favorite clover patch. This means that the clover is covered by water for awhile and takes quite a long time to regrow. Thus, Farmer John has built a set of draina…
题目链接:http://poj.org/problem?id=1459 Power Network Time Limit: 2000MS   Memory Limit: 32768K Total Submissions: 27074   Accepted: 14066 Description A power network consists of nodes (power stations, consumers and dispatchers) connected by power transp…
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 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: 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: 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…
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…
题目链接 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) <= pmax(u) of power, ma…