Farm Game Problem Description “Farm Game” is one of the most popular games in online community. In the community each player has a virtual farm. The farmer can decide to plant some kinds of crops like wheat or paddy, and buy the corresponding crop se…

Description “Farm Game” is one of the most popular games in online community. In the community each player has a virtual farm. The farmer can decide to plant some kinds of crops like wheat or paddy, and buy the corresponding crop seeds. After they gr…

SPFA最长路,思路如下: 先对题目中给出的每条边建边,权值为转化率:增加一个终点S,每个节点到S建边,权值为该物品的单价. 假设X物品最终转化为了Y物品,那么转化之后得到的钱就是 W[x]*转化率1*转化率2*转化率3*转化率4*.....*P[Y] 现在我们关注 转化率1*转化率2*转化率3*转化率4*.....*P[Y] 这个式子,实际上就是求这个式子的最大值. 怎么求?事实上就是节点X到节点S的最长路.如果这样去求,那么需要N次SPFA:所以我们需要反向建边,从S出发开始求最长路.最终比…

Description “Farm Game” is one of the most popular games in online community. In the community each player has a virtual farm. The farmer can decide to plant some kinds of crops like wheat or paddy, and buy the corresponding crop seeds. After they gr…

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题目网址:http://acm.hdu.edu.cn/showproblem.php?pid=1198 题目: Farm Irrigation Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 10132    Accepted Submission(s): 4464 Problem Description Benny has a spac…

Farm Irrigation Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 6590    Accepted Submission(s): 2838 Problem Description Benny has a spacious farm land to irrigate. The farm land is a rectangle…

SPFA求最短路径.见图的时候注意逆向建图. /* 3696 */ #include <iostream> #include <queue> #include <vector> #include <algorithm> #include <cstdio> #include <cstring> #include <cmath> #include <cstdlib> using namespace std; #de…

Farm Irrigation Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 4977    Accepted Submission(s): 2137 Problem Description Benny has a spacious farm land to irrigate. The farm land is a rectangle…

题目: Benny has a spacious farm land to irrigate. The farm land is a rectangle, and is divided into a lot of samll squares. Water pipes are placed in these squares. Different square has a different type of pipe. There are 11 types of pipes, which is ma…