题意: 第一行输入N M C ,表示从1到N有M条无向边,现在要从1走到N 走C次完全不同的路径,求最长边的最小值.下面M行是从a点到b点的距离. 建图: 题上说从两点之间可以有多条边,问的是从1~N的C种走法,所走路径上的最大边最小可以是多少,所以我们用结构体来储存点的距离,用二分搜索中的mid来假设成最大边的值,那么其他边都要小于等于它,然后根据mid建图,两点之间的边数作为容量网络的边权,也就是两点间的容量,(Dinic跑一遍)求出一个最大流,看它与C的关系,如果C大于它,说明mid太小,…

B - Dining Time Limit:2000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u Submit Status Practice POJ 3281 Appoint description:   Description Cows are such finicky eaters. Each cow has a preference for certain foods and drinks, and she w…

题意: 农场主有f种食物,d种饮料,n头牛. 接下来的n行每行第一个数代表第i头牛喜欢吃的食物数量,和第i头牛喜欢喝的饮料数目. 接下来分别是喜欢的食物和饮料的编号. 求解:农场主最多能保证几头牛同时能吃到喜欢的食物和喜欢的饮料. 思路: 从源点到每种食物加流量为1的边,保证每种食物只能被吃一次. 将每头牛分为两个点,连一条流量为1的边,保证每头牛最多只能吃一份食物喝一份饮料. 将每种饮料和汇点都进行连接,同样流量为1. 将牛喜欢的食物和牛进行连边流量为1,将另一组代表牛的点和喜欢的饮料进行连边…

Secret Milking Machine Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 9658   Accepted: 2859 Description Farmer John is constructing a new milking machine and wishes to keep it secret as long as possible. He has hidden in it deep within…

Description Farmer John is constructing a new milking machine and wishes to keep it secret as long as possible. He has hidden in it deep within his farm and needs to be able to get to the machine without being detected. He must make a total of T (1 <…

Secret Milking Machine Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 8189   Accepted: 2485 Description Farmer John is constructing a new milking machine and wishes to keep it secret as long as possible. He has hidden in it deep within…

题目描述 Farmer John is constructing a new milking machine and wishes to keep it secret as long as possible. He has hidden in it deep within his farm and needs to be able to get to the machine without being detected. He must make a total of T (1 <= T <=…

[Usaco2005 feb]Secret Milking Machine 神秘的挤奶机 题目大意:约翰正在制造一台新型的挤奶机,但他不希望别人知道．他希望尽可能久地隐藏这个秘密．他把挤奶机藏在他的农场里,使它不被发现．在挤奶机制造的过程中,他需要去挤奶机所在的地方T(1≤T≤200)次．他的农场里有秘密的地道,但约翰只在返回的时候用它．农场被划分成N(2≤N≤200)块区域,用1到200标号．这些区域被P(1≤P≤40000)条道路连接,每条路有一个小于10^6的长度L．两块区域之间可能有多条…

Description Farmer John is constructing a new milking machine and wishes to keep it secret as long as possible. He has hidden in it deep within his farm and needs to be able to get to the machine without being detected. He must make a total of T (1 <…

Secret Milking Machine Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 12324   Accepted: 3589 Description Farmer John is constructing a new milking machine and wishes to keep it secret as long as possible. He has hidden in it deep within…