题目链接:id=1330">传送门 在线算法: #include <iostream> #include <cstdio> #include <cstring> #include <algorithm> using namespace std; const int maxn = 40010; struct nod{ int to,next,w; }edge[maxn*2]; int head[maxn],ip,tot; bool vis[ma…

Nearest Common Ancestors Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 37386   Accepted: 18694 Description A rooted tree is a well-known data structure in computer science and engineering. An example is shown below: In the figure, each…

题意:给出一棵树,再给出两个节点a.b,求离它们最近的公共祖先.方法一: 先用vector存储某节点的子节点,fa数组存储某节点的父节点,最后找出fa[root]=0的根节点root.      之后求每个节点的“高度”,更节点的高度为1,每往下一层高度+1.      读取a和b后,先求出它们位于同一个高度的祖先:      1.若此祖先相同,则即为最近的公共祖先.      2.若不相同,则求各自的父节点,知道两者的父节点相同,即为最近的公共祖先. #include <iostream>…

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…

POJ - 1330 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 t…

pku 1330 Nearest Common Ancestors 题目链接: http://poj.org/problem?id=1330 题目大意: 给定一棵树的边关系,注意是有向边,因为这个WA一发.然后N个顶点给出了N-1有向边,求一对点之间的最近公共祖先 思路: 裸的离线tarjan Lca即可,但注意是有向边,需要先找出根节点,数组标记.其次要注意前向星存的时候只存一条边即可 代码: #include <iostream> #include <string.h> usi…

POJ.1330 Nearest Common Ancestors (LCA 倍增) 题意分析 给出一棵树,树上有n个点(n-1)条边,n-1个父子的边的关系a-b.接下来给出xy,求出xy的lca节点编号. LCA裸题,用倍增思想. 代码总览 #include <cstdio> #include <algorithm> #include <cstring> #include <cmath> #define nmax 80520 #define demen…

任意门:http://poj.org/problem?id=1330 Nearest Common Ancestors Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 34942   Accepted: 17695 Description A rooted tree is a well-known data structure in computer science and engineering. An example…

POJ 1330 Nearest Common Ancestors Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 24209   Accepted: 12604 Description A rooted tree is a well-known data structure in computer science and engineering. An example is shown below:  In the fi…

POJ 1330 Nearest Common Ancestors 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. No…