早就听人提起过线段树,今天有题搞不出来,讨论上说要用一下线段树,看了下,本质上是空间划分索引,只不过是一维上面的,如果在二维则是四叉树,三维则是八叉树,如果可以动态调整那么跟R-Tree就很相似了,他们都可以对范围查询做出响应.参照书上写了一个,虽然不多,但是渣渣也写的很是费力 #include <iostream> #include <cstdlib> #include <vector> using namespace std; class SegmentTree {…

这道题也有点新意,就是须要记录最小值段和最大值段,然后成段更新这个段,而不用没点去更新,达到提快速度的目的. 本题过的人非常少,由于大部分都超时了,我严格依照线段树的方法去写.一開始竟然也超时. 然后修补了两个地方就过了,详细改动的地方请參看程序. 知道最大值段和最小值段,然后修补一下就能过了.不是特别难的题目. #include <stdio.h> #include <string> #include <algorithm> using namespace std;…

http://www.spoj.com/problems/SEGSQRSS/ SPOJ Problem Set (classical) 11840. Sum of Squares with Segment Tree Problem code: SEGSQRSS Segment trees are extremely useful.  In particular "Lazy Propagation" (i.e. see here, for example) allows one to c…

3165: [Heoi2013]Segment Time Limit: 40 Sec  Memory Limit: 256 MBSubmit: 368  Solved: 148[Submit][Status][Discuss] Description 要求在平面直角坐标系下维护两个操作: 1.在平面上加入一条线段.记第i条被插入的线段的标号为i. 2.给定一个数k,询问与直线 x = k相交的线段中,交点最靠上的线段的编号. Input 第一行一个整数n,表示共n 个操作. 接下来n行,每行第一…

E. XOR on Segment time limit per test 4 seconds memory limit per test 256 megabytes input standard input output standard output You've got an array a, consisting of n integers a1, a2, ..., an. You are allowed to perform two operations on this array:…

题目链接 \(Click\) \(Here\) 李超线段树的模板.但是因为我实在太\(Naive\)了,想象不到实现方法. 看代码就能懂的东西,放在这里用于复习. #include <bits/stdc++.h> using namespace std; const int N = 100010; #define ls (p << 1) #define rs (p << 1 | 1) #define mid ((l + r) >> 1) struct Nod…

BZOJ 洛谷 \(dsu\ on\ tree\).(线段树合并的做法也挺显然不写了) 如果没写过\(dsu\)可以看这里. 对修改操作做一下差分放到对应点上,就成了求每个点子树内出现次数最多的颜色,这就和CF600E类似了.直接用\(dsu\). 修改某个颜色出现次数的时候,最大值不能\(O(1)\)求出,得套个\(set\),所以复杂度是\(O(q\log^2n)\).但常数并不大. 关于复杂度,在CF600E中对一个点的修改是\(O(1)\)的,而本题中可能是\(O(q)\)(一个点上挂着…

Turing Tree Time Limit: 6000/3000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 4768    Accepted Submission(s): 1686 Problem Description After inventing Turing Tree, 3xian always felt boring when solving problems…

The New Year holidays are over, but Resha doesn't want to throw away the New Year tree. He invited his best friends Kerim and Gural to help him to redecorate the New Year tree. The New Year tree is an undirected tree with n vertices and root in the v…

题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=3333 Turing Tree Time Limit: 6000/3000 MS (Java/Others)Memory Limit: 32768/32768 K (Java/Others) 问题描述 After inventing Turing Tree, 3xian always felt boring when solving problems about intervals, because…