Nearest Common Ancestors Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 24587   Accepted: 12779 Description A rooted tree is a well-known data structure in computer science and engineering. An example is shown below:  In the figure, e…

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…

经典LCA操作.. 贴AC代码 import java.lang.reflect.Array; import java.util.*; public class POJ1330 { // 并查集部分 static int[] p; static int find(int u){ if(p[u]!=u){ p[u] = find(p[u]); } return p[u]; } static class Edge{ int to; int next; } // 链式前向星 static int[]…

题目链接:http://poj.org/problem?id=1330 题意就是求一组最近公共祖先,昨晚学了离线tarjan,今天来实现一下. 个人感觉tarjan算法是利用了dfs序和节点深度的关系,大致的意思:dfs如果不递归到递归基,那么dfs就会越递归越深,这个时候深度也是相应增加的,所以这个时候任意在已经遍历过的节点中选取两个点,计算他们的lca也就相当于是用并查集求他们的root.而dfs执行到递归基,转而执行下一个分支的时候,这个时候dfs的节点应当是小于等于之前执行到递归基的节点…

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…

Nearest Common Ancestors Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 14902   Accepted: 7963 Description A rooted tree is a well-known data structure in computer science and engineering. An example is shown below:  In the figure, each…

JDOJ 3055: Nearest Common Ancestors JDOJ传送门 Description 给定N个节点的一棵树,有K次查询,每次查询a和b的最近公共祖先. 样例中的16和7的公共祖先(LCA:Least Common Ancestors)是4. Input 第一行两个整数N(1 < N <= 105).K(1 <= K <= 105) 第2~N行,每行两个整数a.b(1 <= a,b <= N),表示a是b的父亲. 第N+1~N+K+1行,每行两个…

传送门 Nearest Common Ancestors Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 26612   Accepted: 13734 Description A rooted tree is a well-known data structure in computer science and engineering. An example is shown below:    In the figur…

Nearest Common Ancestors Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 27316   Accepted: 14052 Description A rooted tree is a well-known data structure in computer science and engineering. An example is shown below:  In the figure, eac…

Nearest Common Ancestors Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 14698   Accepted: 7839 Description A rooted tree is a well-known data structure in computer science and engineering. An example is shown below:  In the figure, each…