[题目链接] https://www.lydsy.com/JudgeOnline/problem.php?id=1735 [算法] 二分图最小覆盖 [代码] #include<bits/stdc++.h> using namespace std; #define MAXN 1010 struct edge { int to,nxt; } e[MAXN * MAXN]; int i,j,n,m,ans,cntx,cnty,tot; char mp[MAXN][MAXN]; int x[MAXN]…

链接 1735: [Usaco2005 jan]Muddy Fields 泥泞的牧场 思路 这就是个上一篇的稍微麻烦版(是变脸版,其实没麻烦) 用边长为1的模板覆盖地图上的没有长草的土地,不能覆盖草地 每个点(x,y)只有选择x或者y才能被覆盖 还是最小点覆盖,证明在上一篇 横边和竖边得遍历一遍求出,因为不能越过草地嘛 然后左边横边,右边竖边,开心的跑最大流就可以 代码 #include <bits/stdc++.h> #define iter vector<int>::itera…

http://poj.org/problem?id=2226 Muddy Fields Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 9022   Accepted: 3348 Description Rain has pummeled the cows' field, a rectangular grid of R rows and C columns (1 <= R <= 50, 1 <= C <= 5…

http://poj.org/problem?id=2226 Muddy Fields Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 7078   Accepted: 2622 Description Rain has pummeled the cows' field, a rectangular grid of R rows and C columns (1 <= R <= 50, 1 <= C <= 5…

POJ 2226 Muddy Fields 题目链接 题意:给定一个图,要求用纸片去覆盖'*'的位置.纸片能够重叠.可是不能放到'.'的位置,为最少须要几个纸片 思路:二分图匹配求最小点覆盖.和放车那题基本一样.就是注意要预处理一下行列,把连续横的'*'当成一行,竖的'*'当成一列,建图跑最小点覆盖就可以 代码: #include <cstdio> #include <cstring> #include <vector> #include <algorithm&g…

 Muddy Fields Time Limit:1000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u Submit Status Description Rain has pummeled the cows' field, a rectangular grid of R rows and C columns (1 <= R <= 50, 1 <= C <= 50). While good for…

Muddy Fields Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 7340   Accepted: 2715 Description Rain has pummeled the cows' field, a rectangular grid of R rows and C columns (1 <= R <= 50, 1 <= C <= 50). While good for the grass, t…

Muddy Fields 原题去我创的专题里找,在文件夹首页. 题目: 给出N*M矩阵.当中*表示泥土,.表示小草.要你用最少的木板把泥土覆盖. 木板长度不限.可是仅仅能水平和竖直. 行列式二分匹配配.是poj3041建图的加强版. 算法: 由poj3041的建图能够得到灵感.即把木板当作顶点,X轴,Y轴当作边.求解最小顶点覆盖. 3041的激光束不存在障碍物的问题,而这题却有不能压坏小草的限制. 我们能够换个角度思考.既然不能压坏小草,那就相当于该激光束到达这里必须停止了. 所以,我们就以小草…

Muddy Fields Time Limit: 1000ms Memory Limit: 65536KB This problem will be judged on PKU. Original ID: 222664-bit integer IO format: %lld      Java class name: Main   Rain has pummeled the cows' field, a rectangular grid of R rows and C columns (1 <=…

Muddy Fields Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 13235   Accepted: 4879 汪星人语言: Description Rain has pummeled the cows' field, a rectangular grid of R rows and C columns (1 <= R <= 50, 1 <= C <= 50). While good for the…