用的离线算法Tarjan 该算法的详细解释请戳 http://www.cnblogs.com/Findxiaoxun/p/3428516.html 做这个题的时候,直接把1470的代码copy过来,改了改输入输出.这个的难度比那个低. #include<cstdio> #include<algorithm> #include<cstring> #include<vector> using namespace std; ; int father[MAXN],a…

http://poj.org/problem? id=1330 给一个有根树,一个查询节点(u,v)的近期公共祖先 836K 16MS #include<iostream> #include<cstring> #include<cstdio> #include<algorithm> #include<vector> #include<string> #include<set> #include<map> con…

LCA问题的tarjan解法模板 LCA问题 详细 1.二叉搜索树上找两个节点LCA public int query(Node t, Node u, Node v) { int left = u.value; int right = v.value; //二叉查找树内,如果左结点大于右结点,不对,交换 if (left > right) { int temp = left; left = right; right = temp; } while (true) { //如果t小于u.v,往t的右…

该算法的详细解释请戳: http://www.cnblogs.com/Findxiaoxun/p/3428516.html #include<cstdio> #include<algorithm> #include<cstring> #include<vector> using namespace std; ; int father[MAXN],ancestor[MAXN]; bool visit[MAXN]; int ans[MAXN]; vector&l…

Nearest Common Ancestors Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 18136   Accepted: 9608 Description A rooted tree is a well-known data structure in computer science and engineering. An example is shown below: In the figure, each…

A - Nearest Common Ancestors Time Limit:1000MS     Memory Limit:10000KB     64bit IO Format:%lld & %llu Submit Status Description A rooted tree is a well-known data structure in computer science and engineering. An example is shown below: In the figu…

A rooted tree is a well-known data structure in computer science and engineering. An example is shown below:  In the figure, each node is labeled with an integer from {1, 2,...,16}. Node 8 is the root of the tree. Node x is an ancestor of node y if n…

POJ 1470 Closest Common Ancestors(最近公共祖先 LCA) Description Write a program that takes as input a rooted tree and a list of pairs of vertices. For each pair (u,v) the program determines the closest common ancestor of u and v in the tree. The closest co…

POJ 1330 Nearest Common Ancestors / UVALive 2525 Nearest Common Ancestors (最近公共祖先LCA) Description A rooted tree is a well-known data structure in computer science and engineering. An example is shown below: In the figure, each node is labeled with an…

1.前言 最近公共祖先(Least Common Ancestors),简称LCA,是由Tarjan教授(对,又是他)提出的一种在有根树中,找出某两个结点u和v最近的公共祖先问题. 2.什么是最近公共祖先? 在一棵树中,每个结点都有他的父亲和祖先,而最近公共祖先就是两个节点在这棵树上深度最大的公共的祖先节点. 换句话说,就是两个点在这棵树上距离最近的公共祖先节点.结合下图和文字应该很好的诠释了最近公共祖先: PS:在LCA中,也可以将结点本身视为自己的祖先 在这颗以结点1为根的树中,4与5的最近…