QTREEⅠ SPOJ

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树剖模板,注意把边化为点后要查到y的儿子. #include<bits/stdc++.h> using namespace std; ; int f[N],bel[N],w[N],id[N],pos[N],d[N],size[N],son[N],head[N]; int n,idx,cnt,num,T,rt; struct node { int l,r,s,mx; void clean() { l=r=s=mx=-1e9; } }t[N<<]; struct edge { int…

QTREE 树链剖分---模板 spoj QTREE

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SPOJ QTREE 系列解题报告

题目一 : SPOJ 375 Query On a Tree http://www.spoj.com/problems/QTREE/ 给一个树,求a,b路径上最大边权,或者修改a,b边权为t. #include <cstdio> #include <iostream> #include <cstring> #include <cstdlib> #include <algorithm> using namespace std; + ; ; ]; s…

SPOJ QTREE Query on a tree 树链剖分+线段树

题目链接:http://www.spoj.com/problems/QTREE/en/ QTREE - Query on a tree #tree You 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:…

spoj QTREE - Query on a tree(树链剖分+线段树单点更新，区间查询)

传送门:Problem QTREE https://www.cnblogs.com/violet-acmer/p/9711441.html 题解: 树链剖分的模板题,看代码比看文字解析理解来的快~~~~~~~ AC代码献上: #include<iostream> #include<cstdio> #include<cmath> #include<cstring> using namespace std; #define ls(x) ((x)<<1…

SPOJ QTREE

QTREE /* 题目大意:维护一棵树,允许修改边权以及查询链上最大值题解:我们将边权转为点权,标记在深度较深的点上,树链剖分后用线段树处理即可 */ #include <cstdio> #include <cstring> #include <algorithm> using namespace std; const int N=20010; int top[N],nxt[N],v[N],g[N],d[N],son[N],f[N],size[N],st[N],en[…

SPOJ 375 Query on a tree（树链剖分）（QTREE）

You 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 fo…