Problem Description After inventing Turing Tree, 3xian always felt boring when solving problems about intervals, because Turing Tree could easily have the solution. As well, wily 3xian made lots of new problems about intervals. So, today, this sick t…

Problem Description Tom owns a company and he is the boss. There are n staffs which are numbered from 1 to n in this company, and every staff has a ability. Now, Tom is going to assign a special task to some staffs who were in the same group. In a gr…

Description At the entrance to the university, there is a huge rectangular billboard of size h*w (h is its height and w is its width). The board is the place where all possible announcements are posted: nearest programming competitions, changes in th…

      Description There is an apple tree outside of kaka's house. Every autumn, a lot of apples will grow in the tree. Kaka likes apple very much, so he has been carefully nurturing the big apple tree. The tree has N forks which are connected by bran…

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…

title : 可持久化线段树 date : 2021-8-18 tags : 数据结构,ACM 可持久化线段树 可以用来解决线段树存储历史状态的问题. 我们在进行单点修改后,线段树只有logn个(一条链)的节点被修改,我们可以让修改后的树与修改前的树共享节点,节省时间和空间. 在学习之前,我们先引入三个前置知识:离散化.动态开点,权值线段树. 离散化 对于较大的数据范围,只要将关键点记录下来,记录下rank,就能把数据缩小到可以接受的范围,以便建立线段树或其他数据结构来解决问题. 具体步骤 (…

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…

题意 : 给出一段n个数的序列,接下来给出m个询问,询问的内容SPOJ是(L, R)这个区间内不同的数的个数,HDU是不同数的和 分析 : 一个经典的问题,思路是将所有问询区间存起来,然后按右端点排序 最后从左到右将原区间扫一遍,扫的过程当中不断将重复出现的数字右移 也就是如果一个数字重复出现,那么我们记录最右边的那个为有效的,其他都视为不存在 这样一旦遇到一个问询区间的右端点就线段树查询即可. SPOJ: #include<bits/stdc++.h> using namespace std…

题意:统计一段区间内不同的数的和 分析:排序查询区间,离线树状数组 #include <cstdio> #include <cmath> #include <cstring> #include <algorithm> using namespace std; typedef long long LL; ; ; LL c[N]; int n,q,x,y,T,pre[N]; struct Node{ int v,id; }a[N]; bool cmpv(Node…

题目 Source http://acm.hdu.edu.cn/showproblem.php?pid=3333 Description After inventing Turing Tree, 3xian always felt boring when solving problems about intervals, because Turing Tree could easily have the solution. As well, wily 3xian made lots of new…