Problem Description Thanks to a certain "green" resources company, there is a new profitable industry of oil skimming. There are large slicks of crude oil floating in the Gulf of Mexico just waiting to be scooped up by enterprising oil barons. O…

Oil Skimming Time Limit:1000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u Submit Status Practice HDU 4185 Description Thanks to a certain "green" resources company, there is a new profitable industry of oil skimming. There ar…

原文链接http://www.cnblogs.com/zhouzhendong/p/8231146.html 题目传送门 - HDU4185 题意概括 每次恰好覆盖相邻的两个#,不能重复,求最大覆盖次数.(引用大佬的http://blog.csdn.net/u011721440/article/details/38144339) 题解 我们对于每两个相邻#的建边(来回两条). 然后我们把格子黑白染色一下,发现黑点只会向白点连边,白点只会连向黑点连边,于是这个就是二分图了. 然后跑一跑匈牙利. 答…

题目大意:在一个N*N的矩阵里寻找最多有多少个“##”(横着竖着都行).     题目分析:重新构图,直接以相邻的两个油井算中间算以条边,然后进行匹配,看看两两之间最多能匹配多少对. #include<stdio.h> #include<string.h> #include<algorithm> #include<iostream> #include<vector> #include<queue> #include<cmath&…

<题目链接> 题目大意: 给你一张图,图中有 '*' , '.' 两点,现在每次覆盖相邻的两个 '#' ,问最多能够覆盖几次. 解题分析: 无向图二分匹配的模板题,每个'#'点与周围四个方向的'#'建立匹配关系,然后用匈牙利跑一遍,因为匹配的两点各会进行相互匹配一次,所以最大匹配数为ans/2. #include <cstdio> #include <cstring> #include <algorithm> using namespace std; +;…

Battle ships Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 1061    Accepted Submission(s): 377 Problem Description Dear contestant, now you are an excellent navy commander, who is responsible…

PIGS Time Limit: 1000MS   Memory Limit: 10000KB   64bit IO Format: %I64d & %I64u Submit Status Description Mirko works on a pig farm that consists of M locked pig-houses and Mirko can't unlock any pighouse because he doesn't have the keys. Customers…

题目大意: 统计相邻(上下左右)的‘#’的对数. 解法: 与题目hdu1507 Uncle Tom's Inherited Land*类似,需要用奇偶建图.就是行+列为奇数的作为X集合,偶尔作为Y集合,都是‘#’就连边.最后求最大匹配. 数据有点大,直接建图会出错(我试过).可以按照‘#’出现的顺序给顶点编号. #include<iostream> #include<cstdio> #include<cstring> #include<queue> #inc…

Necklace/center> 题目连接: http://acm.hdu.edu.cn/showproblem.php?pid=5727 Description SJX has 2*N magic gems. N of them have Yin energy inside while others have Yang energy. SJX wants to make a necklace with these magic gems for his beloved BHB. To avoid…

http://acm.hdu.edu.cn/showproblem.php?pid=1083 二分图匹配用得很多 这道题只需要简化的二分匹配 #include<iostream> #include<cstdio> #include<cstring> #define maxm 410 using namespace std; int p,n; int master[maxm]; int linking[maxm][maxm]; int has[maxm]; int sol…