3396: [Usaco2009 Jan]Total flow 水流 Time Limit: 1 Sec  Memory Limit: 128 MBSubmit: 45  Solved: 27[Submit][Status] Description   Input 第1行输入N,之后N行每行描述一条水管,前两个英文字母表示水管的两端(大小写字母是不一样的),后一个整数表示水管的流量,流量不会超过1000. Output 一个整数,表示总流量． Sample Input 5 A B 3 B C 3…

#include<cstdio> #include<cstring> #include<algorithm> #include<queue> using namespace std; #define INF 2147483647 #define MAXN 201 #define MAXM 1501 int v[MAXM],cap[MAXM],en,first[MAXN],next[MAXM]; int d[MAXN],cur[MAXN]; queue<…

3396: [Usaco2009 Jan]Total flow 水流 Time Limit: 1 Sec  Memory Limit: 128 MBSubmit: 179  Solved: 73[Submit][Status] Description   Input 第1行输入N,之后N行每行描述一条水管,前两个英文字母表示水管的两端(大小写字母是不一样的),后一个整数表示水管的流量,流量不会超过1000. Output 一个整数,表示总流量． Sample Input 5 A B 3 B C…

最大流生动形象的板子,注意数组开大点 #include<iostream> #include<cstdio> #include<queue> #include<cstring> using namespace std; const int N=100,inf=1e9; int n=26,m,h[N],cnt=1,s=1,t=26,le[N],x; char s1[5],s2[5]; struct qwe { int ne,to,va; }e[N*N*2];…

http://www.lydsy.com/JudgeOnline/problem.php?id=3396 裸的最大流跑过.. #include <cstdio> #include <cstring> #include <cmath> #include <string> #include <iostream> #include <algorithm> #include <queue> using namespace std;…

/* 网络流之最大流Dinic算法模版 */ #include <cstring> #include <cstdio> #include <queue> using namespace std; ; const int inf = 0x3f3f3f3f; struct { int c,f;//c为边的容量,f为边的容量 }edge[maxn][maxn]; int dis[maxn]; int v,e; bool bfs()//利用bfs进行分层处理,当汇点无法分层时得…

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…

UVA 10480 Sabotage (网络流,最大流,最小割) Description The regime of a small but wealthy dictatorship has been abruptly overthrown by an unexpected rebel-lion. Because of the enormous disturbances this is causing in world economy, an imperialist military super…

题目描述 Farmer John always wants his cows to have enough water and thus has made a map of the N (1 <= N <= 700) water pipes on the farm that connect the well to the barn. He was surprised to find a wild mess of different size pipes connected in an appa…

[Luogu2711]小行星(网络流,最大流) 题面 题目描述 星云中有n颗行星,每颗行星的位置是(x,y,z).每次可以消除一个面(即x,y或z坐标相等)的行星,但是由于时间有限,求消除这些行星的最少次数. 输入输出格式 输入格式: 第1行为小行星个数n,第2行至第n+1行为xi, yi, zi,描述第i个小行星所在的位置. 输出格式: 共1行,为消除所有行星的最少次数. 输入输出样例 输入样例#1: 3 1 2 3 2 3 1 1 3 2 输出样例#1: 2 说明 1≤n≤50000 1≤x…

HDU 3416 Marriage Match IV (最短路径,网络流,最大流) Description Do not sincere non-interference. Like that show, now starvae also take part in a show, but it take place between city A and B. Starvae is in city A and girls are in city B. Every time starvae can…

HDU 3605 Escape (网络流,最大流,位运算压缩) Description 2012 If this is the end of the world how to do? I do not know how. But now scientists have found that some stars, who can live, but some people do not fit to live some of the planet. Now scientists want you…

HDU 3338 Kakuro Extension (网络流,最大流) Description If you solved problem like this, forget it.Because you need to use a completely different algorithm to solve the following one. Kakuro puzzle is played on a grid of "black" and "white" ce…

POJ 2711 Leapin' Lizards / HDU 2732 Leapin' Lizards / BZOJ 1066 [SCOI2007]蜥蜴(网络流,最大流) Description Your platoon of wandering lizards has entered a strange room in the labyrinth you are exploring. As you are looking around for hidden treasures, one of…

HDU 4289 Control (网络流,最大流) Description You, the head of Department of Security, recently received a top-secret information that a group of terrorists is planning to transport some WMD(Weapon of Mass Destruction)from one city (the source) to another o…

HDU 4292 Food (网络流,最大流) Description You, a part-time dining service worker in your college's dining hall, are now confused with a new problem: serve as many people as possible. The issue comes up as people in your college are more and more difficult…

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…

Libre 6007 「网络流 24 题」方格取数 / Luogu 2774 方格取数问题 (网络流,最大流) Description 在一个有 m*n 个方格的棋盘中,每个方格中有一个正整数.现要从方格中取数,使任意 2 个数所在方格没有公共边,且取出的数的总和最大.试设计一个满足要求的取数算法.对于给定的方格棋盘,按照取数要求编程找出总和最大的数. Input 第 1 行有 2 个正整数 m 和 n,分别表示棋盘的行数和列数.接下来的 m 行,每行有 n 个正整数,表示棋盘方格中的数. Ou…

Libre 6006 「网络流 24 题」试题库 / Luogu 2763 试题库问题 (网络流,最大流) Description 问题描述: 假设一个试题库中有n道试题.每道试题都标明了所属类别.同一道题可能有多个类别属性.现要从题库中抽取m 道题组成试卷.并要求试卷包含指定类型的试题.试设计一个满足要求的组卷算法. 编程任务: 对于给定的组卷要求,计算满足要求的组卷方案. Input 第1行有2个正整数k和n (2 <=k<= 20, k<=n<= 1000) k 表示题库中试…

Libre 6005 「网络流 24 题」最长递增子序列 / Luogu 2766 最长递增子序列问题(网络流,最大流) Description 问题描述: 给定正整数序列x1,...,xn . (1)计算其最长递增子序列的长度s. (2)计算从给定的序列中最多可取出多少个长度为s的递增子序列. (3)如果允许在取出的序列中多次使用x1和xn,则从给定序列中最多可取出多少个长度为s的递增子序列. 编程任务: 设计有效算法完成(1)(2)(3)提出的计算任务. Input 第1 行有1个正整数n,…

Libre 6004 「网络流 24 题」圆桌聚餐(网络流,最大流) Description 假设有来自n个不同单位的代表参加一次国际会议.每个单位的代表数分别为 ri.会议餐厅共有m张餐桌,每张餐桌可容纳 ci个代表就餐. 为了使代表们充分交流,希望从同一个单位来的代表不在同一个餐桌就餐. 试设计一个算法,给出满足要求的代表就餐方案. Input 文件第1行有2个正整数m和n,m表示单位数,n表示餐桌数. 文件第2行有m个正整数,分别表示每个单位的代表数. 文件第3行有n个正整数,分别表示每个…

Libre 6003 「网络流 24 题」魔术球 (网络流,最大流) Description 假设有n根柱子,现要按下述规则在这n根柱子中依次放入编号为 1,2,3,4......的球. (1)每次只能在某根柱子的最上面放球. (2)在同一根柱子中,任何2个相邻球的编号之和为完全平方数. 试设计一个算法,计算出在n根柱子上最多能放多少个球.例如,在4 根柱子上最多可 放11个球. ´编程任务: 对于给定的n,计算在 n根柱子上最多能放多少个球. Input 第1 行有 1个正整数n,表示柱子数.…

Luogu 2764 最小路径覆盖问题 / Libre 6002 「网络流 24 题」最小路径覆盖 (网络流,最大流) Description 给定有向图G=(V,E).设P是G的一个简单路(顶点不相交)的集合.如果V中每个顶点恰好在P的一条路上,则称P是G的一个路径覆盖.P中路径可以从V的任何一个顶点开始,长度也是任意的,特别地,可以为0.G的最小路径覆盖是G的所含路径条数最少的路径覆盖. 设计一个有效算法求一个有向无环图G的最小路径覆盖. Input 第1行有2个正整数n和m.n是给定有向无…

Luogu 2762 太空飞行计划 / Libre 6001 「网络流 24 题」太空飞行计划 (网络流,最大流) Description W 教授正在为国家航天中心计划一系列的太空飞行.每次太空飞行可进行一系列商业性实验而获取利润.现已确定了一个可供选择的实验集合E={E1,E2,-,Em},和进行这些实验需要使用的全部仪器的集合I={ I1, I2,-,In }.实验Ej 需要用到的仪器是I的子集Rj∈I. 配置仪器Ik 的费用为ck 美元.实验Ej 的赞助商已同意为该实验结果支付pj 美元…

HDU 4280 Island Transport(网络流,最大流) Description In the vast waters far far away, there are many islands. People are living on the islands, and all the transport among the islands relies on the ships. You have a transportation company there. Some route…

POJ 3436 ACM Computer Factory (网络流,最大流) Description As you know, all the computers used for ACM contests must be identical, so the participants compete on equal terms. That is why all these computers are historically produced at the same factory. Eve…

P2936 [USACO09JAN]全流Total Flow 题目描述 Farmer John always wants his cows to have enough water and thus has made a map of the N (1 <= N <= 700) water pipes on the farm that connect the well to the barn. He was surprised to find a wild mess of different…

题目描述 Farmer John always wants his cows to have enough water and thus has made a map of the N (1 <= N <= 700) water pipes on the farm that connect the well to the barn. He was surprised to find a wild mess of different size pipes connected in an appa…

题目描述 Farmer John always wants his cows to have enough water and thus has made a map of the N (1 <= N <= 700) water pipes on the farm that connect the well to the barn. He was surprised to find a wild mess of different size pipes connected in an appa…

[洛谷P3376题解]网络流(最大流)的实现算法讲解与代码 更坏的阅读体验 定义 对于给定的一个网络,有向图中每个的边权表示可以通过的最大流量.假设出发点S水流无限大,求水流到终点T后的最大流量. 起点我们一般称为源点,终点一般称为汇点 内容前置 1.增广路 ​ 在一个网络从源点S到汇点T的一条各边剩余流量都大于0(还能让水流通过,没有堵住)的一条路. 2.分层 ​ 预处理出源点到每个点的距离(每次寻找增广路都要,因为以前原本能走的路可能因为水灌满了,导致不能走了).作用是保证只往更远的地方放水…