原题链接:http://poj.org/problem?id=3268 Silver Cow Party Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 15545   Accepted: 7053 Description One cow from each of N farms (1 ≤ N ≤ 1000) conveniently numbered 1..N is going to attend the big cow…

题目链接:http://poj.org/problem?id=3268 Silver Cow Party Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 24527   Accepted: 11164 Description One cow from each of N farms (1 ≤ N ≤ 1000) conveniently numbered 1..N is going to attend the big co…

POJ 3268 Silver Cow Party Description One cow from each of N farms (1 ≤ N ≤ 1000) conveniently numbered 1..N is going to attend the big cow party to be held at farm #X (1 ≤ X ≤ N). A total of M (1 ≤ M ≤ 100,000) unidirectional (one-way roads connects…

Silver Cow Party Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 13611   Accepted: 6138 Description One cow from each of N farms (1 ≤ N ≤ 1000) conveniently numbered 1..N is going to attend the big cow party to be held at farm #X (1 ≤ X…

一.题面 POJ3268 二.分析 该题的意思就是给定了一个由每个节点代表农场的有向图,选定一个农场X办party,其余农场的都要去,每个农场的cow都走最短路,走的时间最久的cow耗时多少. 了解题意后,最开始想的是直接用floyd,但是复杂度已经到10的9次方了.这题比较特殊的一点就是无论是回来还是去都与X这个点有关,所以,当我们思考去求X到其他点的最短路径时,即根据输入的图求,其实就是在求返回的时长.如果我们把输入的图的路径的方向都反一下,即$a-b$变成$b-a$,这样相当于就是求其他所…

Description One cow ≤ N ≤ ) conveniently numbered ..N ≤ X ≤ N). A total of M ( ≤ M ≤ ,) unidirectional (one-way roads connects pairs of farms; road i requires Ti ( ≤ Ti ≤ ) units of time to traverse. Each cow must walk to the party and, when the part…

描述: One cow from each of N farms (1 ≤ N ≤ 1000) conveniently numbered 1..N is going to attend the big cow party to be held at farm #X (1 ≤ X ≤ N). A total of M (1 ≤ M ≤ 100,000) unidirectional (one-way roads connects pairs of farms; road i requires T…

描述 One cow from each of N farms (1 ≤ N ≤ 1000) conveniently numbered 1..N is going to attend the big cow party to be held at farm #X (1 ≤ X ≤ N). A total of M (1 ≤ M ≤ 100,000) unidirectional (one-way roads connects pairs of farms; road i requires Ti…

有n个农场,编号1~N,农场里奶牛将去X号农场.这N个农场之间有M条单向路(注意),通过第i条路将需要花费Ti单位时间.选择最短时间的最优路径来回一趟,花费在去的路上和返回农场的这些最优路径的最长时间是多少? 思路:计算出每头牛去X并且回来的最短路径所需要的时间,然后求出这n-1个农场的牛的最长时间即可,两次运用dijkstra: 1 计算回来的时间:以X为源点,求出源点到各个农场的最短路径: 2 计算去的时间:将路径反转,在用一次djk,求源点到农场的最短路径(实则求牛去X的最短路径): 3…

Silver Cow Party Time Limit:2000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u Submit Status Practice POJ 3268 Description One cow from each of N farms (1 ≤ N ≤ 1000) conveniently numbered 1..N is going to attend the big cow party to b…