Muddy Fields Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 8881   Accepted: 3300 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…

/* 题意:用木板盖住泥泞的地方,不能盖住草.木板任意长!可以重叠覆盖! '*'表示泥泞的地方,'.'表示草! 思路: 首先让我们回忆一下HDU 2119 Matrix这一道题,一个矩阵中只有0, 1,然后让我们通过选择一行,或者 是一列将其所在行的或者所在列的 1全部删掉,求出最少需要几步? 这道题的思路就是:将行标 和 列标值为1的建立一条边!通过匈牙利算法可以得到这个二分图的最大匹配数 最大匹配数==最小顶点覆盖数!最小顶点覆盖就是用最少的点覆盖了这个二分图的所有的边,然后去掉这些 最小覆…

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…

PIGS Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 18727   Accepted: 8508 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 come t…

Golden Eggs Time Limit: 6000/3000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 501    Accepted Submission(s): 281 Problem Description There is a grid with N rows and M columns. In each cell you can choose to put…

题目链接: http://poj.org/problem?id=3687 要逆向建图,输入的时候要判重边,找入度为0的点的时候要从大到小循环,尽量让编号大的先入栈,输出的时候注意按编号的顺序输出重量,不是按重量大小输出编号.. 题目确实很简单,但是感觉很经典. #include <stdio.h> #include <string.h> #include <stack> using namespace std; ][], vis[]; ], weight[]; stac…

Chessboard Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 14787   Accepted: 4607 Description Alice and Bob often play games on chessboard. One day, Alice draws a board with size M * N. She wants Bob to use a lot of cards with size 1 * 2…

Missile Time Limit: 2 Seconds      Memory Limit: 65536 KB You control N missile launching towers. Every tower has enough missiles, but for each tower only one missile can be launch at the same time. Before the launching, every missile need T1 seconds…

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…