Special Fish Problem Description There is a kind of special fish in the East Lake where is closed to campus of Wuhan University. It's hard to say which gender of those fish are, because every fish believes itself as a male, and it may attack one of s…

layout: post title: 训练指南 UVALive - 4043(二分图匹配 + KM算法) author: "luowentaoaa" catalog: true mathjax: true tags: - 二分图匹配 - 图论 - 训练指南 Ants UVALive - 4043 题意 给你n个白点和n个黑点的平面坐标,要求用n条不相交的线连起来,每条线段连一个白点和黑点,每个点连一条线,也就是匹配.让你输出第i个白点所对应的黑点. 思路 二分图完美匹配问题.但是题目…

Special Fish Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 2367    Accepted Submission(s): 878 Problem Description There is a kind of special fish in the East Lake where is closed to campus o…

链接:https://www.nowcoder.com/acm/contest/143/E来源:牛客网 Nowcoder University has 4n students and n dormitories ( Four students per dormitory). Students numbered from 1 to 4n. And in the first year, the i-th dormitory 's students are (x1[i],x2[i],x3[i],x4[…

Kuhn-Munkres算法 KM算法,求完备匹配下的最大权匹配,时间复杂度O(\(n^3\)) 所谓的完备匹配就是在二部图中,x点集中的所有点都有对应的匹配 且 y点集中所有的点都有对应的匹配 ,则称该匹配为完备匹配 算法思想 (1)初始化可行顶标的值: (2)用匈牙利算法寻找完备匹配: (3)若未找到完备匹配则修改可行顶标的值: (4)重复(2)(3)直到找到相等子图的完备匹配为止. 模板 #include <bits/stdc++.h> using namespace std; #def…

Young naturalist Bill studies ants in school. His ants feed on plant-louses that live on apple trees. Each ant colony needs its own apple tree to feed itself. Bill has a map with coordinates of n ant colonies and n apple trees. He knows that ants tra…

求最大费用能够将边权取负以转化成求最小费用. 然而此时依旧不正确.由于会优先寻找最大流.可是答案并不一定出如今满流的时候.所以要加一些边(下图中的红边)使其在答案出现时满流. 设全部边的流量为1,花费例如以下图所看到的. 显然最大花费是1001.而没有红边的情况下会得到3. #include <algorithm> #include <iostream> #include <cstring> #include <cstdlib> #include <c…

Kingdom of Obsession Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 49    Accepted Submission(s): 14 Problem Description There is a kindom of obsession, so people in this kingdom do things very…

奔小康赚大钱 Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 1836    Accepted Submission(s): 798 Problem Description 传说在遥远的地方有一个非常富裕的村落,有一天,村长决定进行制度改革:重新分配房子.这可是一件大事,关系到人民的住房问题啊.村里共有n间房间,刚好有n家老百姓,考虑到每…

The Perfect StallHal Burch Farmer John completed his new barn just last week, complete with all the latest milking technology. Unfortunately, due to engineering problems, all the stalls in the new barn are different. For the first week, Farmer John r…