A. Link/Cut Tree 题目连接: http://www.codeforces.com/contest/614/problem/A Description Programmer Rostislav got seriously interested in the Link/Cut Tree data structure, which is based on Splay trees. Specifically, he is now studying the expose procedure…

A - Link/Cut Tree Programmer Rostislav got seriously interested in the Link/Cut Tree data structure, which is based on Splay trees. Specifically, he is now studying the exposeprocedure. Unfortunately, Rostislav is unable to understand the definition…

Problem description Programmer Rostislav got seriously interested in the Link/Cut Tree data structure, which is based on Splay trees. Specifically, he is now studying the exposeprocedure. Unfortunately, Rostislav is unable to understand the definitio…

A. Link/Cut Tree time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Programmer Rostislav got seriously interested in the Link/Cut Tree data structure, which is based on Splay trees. Specifica…

C. Link Cut Centroids Fishing Prince loves trees, and he especially loves trees with only one centroid. The tree is a connected graph without cycles. A vertex is a centroid of a tree only when you cut this vertex (remove it and remove all edges from…

鉴于最近写bzoj还有51nod都出现写不动的现象,决定学习一波厉害的算法/数据结构. link cut tree:研究popoqqq那个神ppt. bzoj1036:维护access操作就可以了. #include<cstdio> #include<cstring> #include<cctype> #include<algorithm> #include<queue> using namespace std; #define rep(i,s,…

Link/cut Tree 一棵link/cut tree是一种用以表示一个森林,一个有根树集合的数据结构.它提供以下操作: 向森林中加入一棵只有一个点的树. 将一个点及其子树从其所在的树上断开. 将一个点连接至另一个顶点,作为其子节点. 求出一个点所在树的根.通过对两个不同的点进行此操作,我们可以判断他们是否属于同一棵树. (翻译自Link/cut tree - Wikipedia,英语好的小伙伴看这个就很不错) 在link/cut tree中,边分为两种:偏爱边(preferred edge…

Link Cut Tree 刚开始写了个指针版..调了一天然后放弃了.. 最后还是学了黄学长的板子!! #include <bits/stdc++.h> #define INF 0x3f3f3f3f #define full(a, b) memset(a, b, sizeof a) using namespace std; typedef long long ll; inline int lowbit(int x){ return x & (-x); } inline int read…

为了优化体验(其实是强迫症),蒟蒻把总结拆成了两篇,方便不同学习阶段的Dalao们切换. LCT总结--应用篇戳这里 概念.性质简述 首先介绍一下链剖分的概念(感谢laofu的讲课) 链剖分,是指一类对树的边进行轻重划分的操作,这样做的目的是为了减少某些链上的修改.查询等操作的复杂度. 目前总共有三类:重链剖分,实链剖分和并不常见的长链剖分 重链剖分 实际上我们经常讲的树剖,就是重链剖分的常用称呼. 对于每个点,选择最大的子树,将这条连边划分为重边,而连向其他子树的边划分为轻边. 若干重边连接在…

link cut tree入门题 首先说明本人只会写自底向上的数组版(都说了不写指针.不写自顶向下QAQ……) 突然发现link cut tree不难写... 说一下各个函数作用: bool isroot(int x):判断x是否为所在重链(splay)的根 void down(int x):下放各种标记 void rotate(int x):在x所在重链(splay)中将x旋转到fa[x]的位置上 void splay(int x):在x坐在重链(splay)中将x旋转到根 void acce…