牛的聚会 题目大意:一群牛在一块农田的不同的点,现在他们都要去到同一个地方开会,然后现在从那个地方回到原来的位置,点与点之间的连线都是单向的,并且通过一个路径需要一定时间,问你现在哪只牛需要最多的时间? 这一题可以这么看,回来的时候可以是从汇点(开会的地方)去到不同点的最短距离,然后从不同的点去的时候可以看做从汇点沿着路径的反方向看怎么走最短时间. 这样看这一题就简单很多了,因为没有负边,直接Dijkstra算法,算两次即可 #include <iostream> #include <f…

题目链接:https://vjudge.net/problem/POJ-3268 题意:点X处开办排队,其他点的牛到X点去参加派对,然后从X点回到各自的点,通路是单向的,所有牛都要走最短路, 求出所有牛走的最短路中最长的那条路. (直接看代码吧,就是一处改一下,别的和dijkstra板子差不多) #include <iostream> #include <cstring> #include <algorithm> #include <cstdio> #inc…

思路:有向图.假设在X牧场参加party,从X回家的时候,以X为起点,使用一次Dijkstra算法即可.难点在于去X参加party的最短路如何求解. 这时候我们可以反向建图,即把原来有向图的方向全部反向,形成一幅新的有向图G',此时再对G'使用一次以X为起点的Dijkstra算法即    可求得原图G中其他各点以X为终点的最短路径. #include<iostream> #include<vector> #include<string> #include<cmat…

#include<iostream> #include<queue> #include<cstring> using namespace std; +,INF=0x3f3f3f3f; int h[N],e[N],ne[N],w[N],idx; int n,m,x; int dist[N]; bool st[N]; struct node{ int from; int to; int w; }p[N]; void add(int a,int b,int c) { e[id…

题目传送门 1 2 题意:有向图,所有点先走到x点,在从x点返回,问其中最大的某点最短路程 分析:对图正反都跑一次最短路,开两个数组记录x到其余点的距离,这样就能求出来的最短路以及回去的最短路. POJ 3268 //#include <bits/stdc++.h> #include <cstdio> #include <queue> #include <algorithm> #include <cstring> using namespace…

题目链接:http://poj.org/problem?id=3268 Silver Cow Party Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 19211   Accepted: 8765 Description One cow from each of N farms (1 ≤ N ≤ 1000) conveniently numbered 1..N is going to attend the big cow…

POJ 3268 Silver Cow Party (最短路径) 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 c…

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…

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…

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…

Silver Cow Party Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 12674   Accepted: 5651 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 …

Silver Cow Party Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 13982   Accepted: 6307 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 …

                                                                                                   Silver Cow Party Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 19325   Accepted: 8825 Description One cow from each of N farms (1 ≤ N ≤…

Silver Cow Party 题目链接: http://acm.hust.edu.cn/vjudge/contest/122685#problem/D 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 ≤…

Silver Cow Party Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 17017   Accepted: 7767 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 …

Silver Cow Party Time Limit: 2000MS   Memory Limit: 65536K Total Submissions:28457   Accepted: 12928 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 …

Silver Cow Party Time Limit : 4000/2000ms (Java/Other)   Memory Limit : 131072/65536K (Java/Other) Total Submission(s) : 1   Accepted Submission(s) : 1 Problem Description One cow from each of N farms (1 ≤ N ≤ 1000) conveniently numbered 1..N is goin…

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…

Silver Cow Party 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…

Silver Cow Party Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 22864   Accepted: 10449 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…

Silver Cow Party Descriptions 给出n个点和m条边,接着是m条边,代表从牛a到牛b需要花费c时间,现在所有牛要到牛x那里去参加聚会,并且所有牛参加聚会后还要回来,给你牛x,除了牛x之外的牛,他们都有一个参加聚会并且回来的最短时间,从这些最短时间里找出一个最大值输出 Input 第1行:三个空格分隔的整数,分别为: N, M和 X 行2 .. M +1:行 i +1描述具有三个空格分隔整数的道路 i: A i, B i和 T i.所描述的道路从农场A i运行 到农场 B…

Silver cow party 迪杰斯特拉+反向 题意 有n个农场,编号1到n,每个农场都有一头牛.他们想要举行一个party,其他牛到要一个定好的农场中去.每个农场之间有路相连,但是这个路是单向的,并且去了还得回来,求花费时间最多是多少? 解题思路 很容易想明白需要分两步 第一步:算出目的点到其他点的最短距离, 这一步很好实现,直接使用Dijkstra即可 第二部:算出其他点到终点的最短距离. 关键就在第二部.迪杰斯特拉算的是某一点到其他所有点的最短距离,而这次我们是求的其他点到某一点的最短…

Silver Cow Party Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 15989   Accepted: 7303 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 …

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…

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…

Silver Cow Party   Time Limit(Common/Java):2000MS/20000MS     Memory Limit:65536KByte Total Submit: 58            Accepted: 28 Description One cow from each of N farms (1 ≤ N ≤ 1000) conveniently numbered 1..N is going to attend the big cow party to…

Silver Cow Party Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 15156   Accepted: 6843 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…

Silver Cow Party Time Limit:2000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u 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…

P1821 [USACO07FEB]银牛派对Silver Cow Party 题目描述 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 co…

题目描述 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…