Going Home Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 3443    Accepted Submission(s): 1763 Problem Description On a grid map there are n little men and n houses. In each unit time, every…

网络流裸题: 分两部分建图,求不要求满流的最大费用最大流..... Yu-Gi-Oh! Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 401    Accepted Submission(s): 108 Problem Description "Yu-Gi-Oh!", also known as "Dueling…

Matrix Again Time Limit: 5000/2000 MS (Java/Others) Memory Limit: 102400/102400 K (Java/Others) Total Submission(s): 16 Accepted Submission(s): 7   Problem Description Starvae very like play a number game in the n*n Matrix. A positive integer number…

Matrix Again Time Limit: 5000/2000 MS (Java/Others)    Memory Limit: 102400/102400 K (Java/Others)Total Submission(s): 4255    Accepted Submission(s): 1233 Problem Description Starvae very like play a number game in the n*n Matrix. A positive integer…

最小费用最大流板子,没有压行.利用重标号让边权非负,用Dijkstra进行增广,在理论和实际上都比SPFA增广快得多.教程略去.转载请随意. #include <cstdio> #include <cstring> #include <algorithm> #include <functional> #include <queue> using namespace std; ; const int inf = 0x33333333; typede…

其实本来打算做最小费用最大流的题目前先来点模板题的,,,结果看到这道题二话不说(之前打太多了)敲了一个dinic,快写完了发现不对 我当时就这表情→   =_=你TM逗我 刚要删突然感觉dinic的模板中的bfs就相当于找每天边的权都为1的图上的最短路,稍稍改一下就能变成spfa,于是重新写了一下,但是函数名还是bfs... 然后又发现不对,最后要返回路径的,dfs也要改= =结果变成了非递归,但是函数名还是dfs... 于是一个看似是dinic,实则垃圾得不行的最小费用最大流就敲完了 然后调了…

G. Underfail time limit per test:1 second memory limit per test:256 megabytes input:standard input output:standard output You have recently fallen through a hole and, after several hours of unconsciousness, have realized you are in an underground cit…

将每个点拆分成原点A与伪点B,A->B有两条单向路(邻接表实现时需要建立一条反向的空边,并保证环路费用和为0),一条残留容量为1,费用为本身的负值(便于计算最短路),另一条残留容量+∞,费用为0(保证可以多次通过该点,但费用只计算一次). 另外伪点B与原点右侧与下方的点有一条单向路(邻接表实现需要建立反向空边),残留容量为+∞,费用为0.源点0到点1有一条单向路,残留容量为K(可以通过K次),最后一个点的伪点2*n*n与汇点2*n*n+1有一条单向边,残留容量为K,两条边的费用都为0. 构图成功…

题目 Source http://acm.hdu.edu.cn/showproblem.php?pid=5900 Description Every school has some legends, Northeastern University is the same. Enter from the north gate of Northeastern University,You are facing the main building of Northeastern University.…

P3381 [模板]最小费用最大流 题目描述 如题,给出一个网络图,以及其源点和汇点,每条边已知其最大流量和单位流量费用,求出其网络最大流和在最大流情况下的最小费用. 输入输出格式 输入格式: 第一行包含四个正整数N.M.S.T,分别表示点的个数.有向边的个数.源点序号.汇点序号. 接下来M行每行包含四个正整数ui.vi.wi.fi,表示第i条有向边从ui出发,到达vi,边权为wi(即该边最大流量为wi),单位流量的费用为fi. 输出格式: 一行,包含两个整数,依次为最大流量和在最大流量情况下的…