题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1533 On a grid map there are n little men and n houses. In each unit time, every little man can move one unit step, either horizontally, or vertically, to an adjacent point. For each little man, you need…

Going Home Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 3125    Accepted Submission(s): 1590 Problem Description On a grid map there are n little men and n houses. In each unit time, every…

这就是一道最小费用最大流问题 最大流就体现到每一个'm'都能找到一个'H',但是要在这个基础上面加一个费用,按照题意费用就是(横坐标之差的绝对值加上纵坐标之差的绝对值) 然后最小费用最大流模板就是再用最短路算法找最小费用路径.然后在找到这条路径上面的最大流..就这样一直找下去 代码: 1 //这是一个最小费用最大流问题 2 //最大费用最小流只要在添加边的时候换一下位置就好了 3 //求最大费用最大流只需要把费用换成相反数,用最小费用最大流求解即可 4 #include <cstdio> 5…

Going Home Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 7405    Accepted Submission(s): 3907 Problem Description On a grid map there are n little men and n houses. In each unit time, every l…

Coding Contest Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 1751    Accepted Submission(s): 374 Problem Description A coding contest will be held in this university, in a huge playground. The…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=3667 思路:由于花费的计算方法是a*x*x,因此必须拆边,使得最小费用流模板可用,即变成a*x的形式.具体的拆边方法为:第i次取这条路时费用为(2*i-1)*a (i<=5),每条边的容量为1.如果这条边通过的流量为x,那正好sigma(2*i-1)(1<<i<<x)==x^2.然后就是跑最小费用最大流了. #include<iostream> #include<…

Tour Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 65535/65535 K (Java/Others)Total Submission(s): 2925    Accepted Submission(s): 1407 Problem Description In the kingdom of Henryy, there are N (2 <= N <= 200) cities, with M (M <= 30000…

Special Fish Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2189    Accepted Submission(s): 826 Problem Description There is a kind of special fish in the East Lake where is closed to campus of…

Coding Contest Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 2653    Accepted Submission(s): 579 Problem Description A coding contest will be held in this university, in a huge playground. The…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1853 There are N cities in our country, and M one-way roads connecting them. Now Little Tom wants to make several cyclic tours, which satisfy that, each cycle contain at least two cities, and each city b…