题意:Bob想要开一个运动会,有n个房子和n-1条路(一棵树),Bob希望每个人都从不同的房子开始跑,要求跑的尽可能远,而且每条路只能走最多一次.Bob希望所有人跑的距离的极差不大于q,如果起点的编号需要连续,那么最多多少个起点. 题解:首先求出每个点所能跑的最大距离(参考hdu2196),问题将转化成给n个数字,求差值不超过q的最大区间.m个询问,n个数,N<=50000 M<=500,所以对于每一次询问可以在O(n)的复杂度求解,st算法求区间最大最小值,尺取法求最大长度. (去年做219…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=4123 参考博客:两种解法-树形dp+二分+单调队列(或RMQ)-hdu-4123-Bob’s Race - cc_again的专栏 - CSDN博客  https://blog.csdn.net/cc_again/article/details/12011757 题意:给出一棵有n个点的树,每条树边都有一个权值,对于每一个点,它都有一个编号,我们取它到其他点的最大距离记录下来,现在q个询问,每个询问…

题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=4123 Time Limit: 5000/2000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) 问题描述 Bob wants to hold a race to encourage people to do sports. He has got trouble in choosing the route. There are…

题目链接 Problem Description Bob wants to hold a race to encourage people to do sports. He has got trouble in choosing the route. There are N houses and N - 1 roads in his village. Each road connects two houses, and all houses are connected together. To…

Bob’s Race Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 378   Accepted: 119 Description Bob wants to hold a race to encourage people to do sports. He has got trouble in choosing the route. There are N houses and N - 1 roads in his vil…

Bob’s Race Time Limit: 5000/2000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 3905    Accepted Submission(s): 1245 Problem Description Bob wants to hold a race to encourage people to do sports. He has got trouble…

http://acm.hdu.edu.cn/showproblem.php? pid=4123 Problem Description Bob wants to hold a race to encourage people to do sports. He has got trouble in choosing the route. There are N houses and N - 1 roads in his village. Each road connects two houses,…

Bob’s Race Time Limit: 5000/2000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Problem Description Bob wants to hold a race to encourage people to do sports. He has got trouble in choosing the route. There are N houses and N - 1 roads…

给出一棵树,编号为1~n,给出数m 漂亮mm连续n天锻炼身体,每天会以节点i为起点,走到离i最远距离的节点 走了n天之后,mm想到知道自己这n天的锻炼效果 于是mm把这n天每一天走的距离记录在一起,成为一段长度为n的数列 现在mm想要从这数列中选出一个连续的区间,要求这个区间的max-min<=m 输出最长的区间 做了一个下午 思路: 分成2个部分: 1.求出数列,即对于一棵树,求出每一个节点能到达的最远距离 2.对于这段数列,选出一个区间,使得区间的max-min<=m,并且使得区间长度尽量…

POJ - 3162Walking Race 题目大意:有n个训练点,第i天就选择第i个训练点为起点跑到最远距离的点,然后连续的几天里如果最远距离的最大值和最小值的差距不超过m就可以作为观测区间,问这样的区间最长的长度? 一开始楞是没看懂题意,最讨厌这种四级题,这是在刁难我英语小能手(能用翻译的就不自己动手).而且这题感觉单调队列那里的处理更难一点,不过还是来说一说怎么树形dp取得最远距离,先画个简简单单丑丑的图 我们直接从1作为根节点开始dfs的话,可以处理1的最远距离,并且可以得出到其它节点…