[POI2014] HOT-Hotels 题面翻译 给定一棵树,在树上选 33 个点,要求两两距离相等,求方案数。 题目描述 There are nn towns in Byteotia, connected with only n−1n−1 roads. Each road directly links two towns. All the roads have the same length and are two way. It is known that every ...
【洛谷】P5904 [POI2014]HOT-Hotels(长链剖分) 原题链接 题意 给出一棵有 nn 个点的树,求有多少组点 (i,j,k)(i,j,k) 满足i,j,ki,j,k 两两之间的距离都相等。 (i,j,k)(i,j,k) 与(i,k,j)(i,k,j) 算作同一组。 1≤n≤1051≤n≤105。 思路 对于每一个节点 uu,统计其子树内的...
The king desires that the hotels be in different towns and at the same distance one from each other. Help the king out by writing a program that determines the number of possible locations of the hotel triplet in Byteotia. 输入格式 The first line of the standard input contains a single int...
【题解】[POI2014]HOT-Hotels 加强版 [POI2014]HOT-Hotels 加强版 \(\text{Solution:}\) 我们先试着观察一下答案的形式,最初我猜是全部长成一个点在上两个点在子树内的,但这样显然漏掉了一些情况:有可能它不是祖先但是到达另外两个点的距离是相同的。 那么应该怎么处理这种问题呢?我们发现即使是这样的情况...
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