Cow Marathon Time Limit: 2000MS   Memory Limit: 30000K Total Submissions: 5117   Accepted: 2492 Case Time Limit: 1000MS Description After hearing about the epidemic of obesity in the USA, Farmer John wants his cows to get more exercise, so he has com…

题目链接:http://poj.org/problem?id=1985 After hearing about the epidemic of obesity in the USA, Farmer John wants his cows to get more exercise, so he has committed to create a bovine marathon for his cows to run. The marathon route will include a pair o…

题目大意:给出一棵树.求两点间的最长距离. 思路:裸地树的直径.两次BFS,第一次随便找一个点宽搜.然后用上次宽搜时最远的点在宽搜.得到的最长距离就是树的直径. CODE: #include <queue> #include <cstdio> #include <cstring> #include <iostream> #include <algorithm> #define MAX 80010 using namespace std; int…

poj1985 Cow Marathon 树的直径裸题 树的直径的一般求法: 任意一点为起点,dfs/bfs找出与它最远的点$u$ 以$u$为起点,dfs/bfs找出与它最远的点$v$ 则$d(u,v)$是一条直径 下面给出poj1985的code(poj2631自行修改) #include<iostream> #include<cstdio> #include<cstring> #define re register using namespace std; int…

Cow Marathon Time Limit: 2000MS   Memory Limit: 30000K Total Submissions: 4424   Accepted: 2214 Case Time Limit: 1000MS Description After hearing about the epidemic of obesity in the USA, Farmer John wants his cows to get more exercise, so he has com…

Cow Marathon Time Limit: 2000MS   Memory Limit: 30000K Total Submissions: 3195   Accepted: 1596 Case Time Limit: 1000MS Description After hearing about the epidemic of obesity in the USA, Farmer John wants his cows to get more exercise, so he has com…

Cow Marathon Time Limit: 2000MS   Memory Limit: 30000K Total Submissions: 4185   Accepted: 2118 Case Time Limit: 1000MS Description After hearing about the epidemic of obesity in the USA, Farmer John wants his cows to get more exercise, so he has com…

3363: [Usaco2004 Feb]Cow Marathon 奶牛马拉松 Description ​ 最近美国过度肥胖非常普遍,农夫约翰为了让他的奶牛多做运动,举办了奶牛马拉松．马拉 松路线要尽量长,所以,告诉你农场的地图(该地图的描述与上题一致),请帮助约翰寻找两个 最远农场间的距离． Input ​ 第1行:两个分开的整数N和M. ​ 第2到M+1行:每行包括4个分开的内容,Fi,F2,L,D分别描述两个农场的编号,道路的长 度,F1到F2的方向N,E,S,W． Output ​ 一个…

Cow Marathon Time Limit: 2000MS   Memory Limit: 30000K Total Submissions: 5496   Accepted: 2685 Case Time Limit: 1000MS Description After hearing about the epidemic of obesity in the USA, Farmer John wants his cows to get more exercise, so he has com…

传送门 Cow Marathon Time Limit: 2000MS   Memory Limit: 30000K Total Submissions: 5362   Accepted: 2634 Case Time Limit: 1000MS Description After hearing about the epidemic of obesity in the USA, Farmer John wants his cows to get more exercise, so he has…