题目连接:http://acm.hdu.edu.cn/showproblem.php?pid=5274 题意:给一棵树和叶子的值,然后有单点修改操作和询问区间操作,询问的是每一个值出现的奇偶次数,如果全是偶数次,则输出-1,否则输出那个奇数次的数,题目保证只有一个数出现奇数次. 题解:这里的题很巧妙,要想到异或的特殊性质 #include<cstdio> #define F(i,a,b) for(int i=a;i<=b;i++) #define root 1,n,1 #define l…

Hdu 5274 Dylans loves tree (树链剖分模板) 题目传送门 #include <queue> #include <cmath> #include <cstdio> #include <cstring> #include <cstdlib> #include <iostream> #include <algorithm> #include <vector> #define ll long…

题目 SP375 QTREE - Query on a tree 解析 也就是个蓝题,因为比较长 树剖裸题(基本上),单点修改,链上查询. 顺便来说一下链上操作时如何将边上的操作转化为点上的操作: 可以看到这个题然我们对边进行操作,我们的树剖是对节点进行操作的,所以我们考虑把边权变为点权. 发现我们节点的点权是连向它的边的边权,所以我们要操作边权的话,我们操作的实际上是其连向点的点权, 假设我们要修改1-4之间的这两条边 我们修改的实际上就是这2,4两个点 我们节点的点权为其父节点连向它的边的边…

Dylans loves tree Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 1915    Accepted Submission(s): 492 Problem Description Dylans is given a tree with N nodes. All nodes have a value A[i].Nodes…

题目:http://codeforces.com/contest/504/problem/E 快速查询LCP,可以用后缀数组,但树上的字符串不是一个序列: 所以考虑转化成序列—— dfs 序! 普通的 dfs 序中,子树是一段连续的区间,而这里要查询的是链,自然想到树链剖分后的 dfs 序: 这样一条重链在 dfs 序上是一段连续的区间,查询 LCP 时一段一段查询即可,可以用 vector 存下一条路径的所有段: 还要区分方向,所以把 dfs 序得到的字符串再反向复制一遍,为了两串之间不影响,…

Dylans loves tree Problem Description Dylans is given a tree with N nodes. All nodes have a value A[i].Nodes on tree is numbered by 1∼N. Then he is given Q questions like that: ①0 x y:change node x′s value to y ②1 x y:For all the value in the path fr…

复习几乎考不到的树剖.维护min以及min个数,打set和add标记即可,注意set优先级优于add. #include<iostream> #include<cstdio> #include<cstring> #include<algorithm> #include<cmath> #define dbg(x) cerr << #x << " = " << x <<endl us…

Dylans loves tree Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 1444    Accepted Submission(s): 329 Problem Description Dylans is given a tree with N nodes. All nodes have a value A[i].Nodes…

You are given a node-labeled rooted tree with n nodes. Define the query (x, k): Find the node whose label is k-th largest in the subtree of the node x. Assume no two nodes have the same labels. Input The first line contains one integer n (1 <= n <=…

ιYou are given a tree (an acyclic undirected connected graph) with N nodes, and edges numbered 1, 2, 3...N-1. We will ask you to perfrom some instructions of the following form: CHANGE i ti : change the cost of the i-th edge to tior QUERY a b : ask f…