http://www.lightoj.com/volume_showproblem.php?problem=1089 题意:给出许多区间,查询某个点所在的区间个数 思路:线段树,由于给出的是区间,查询的是点,考虑将其离线并离散化,普通线段树即可. /** @Date : 2016-12-17-20.49 * @Author : Lweleth (SoungEarlf@gmail.com) * @Link : https://github.com/ * @Version : */ #include…

Mayor's posters POJ 2528 传送门 线段树区间修改加离散化 #include <cstdio> #include <iostream> #include <queue> #include <cmath> #include <algorithm> #include <cstring> using namespace std; #define ll long long #define P pair<int,in…

题目分析:线段树区间更新+离散化 代码如下: # include<iostream> # include<cstdio> # include<queue> # include<vector> # include<list> # include<map> # include<set> # include<cstdlib> # include<string> # include<cstring&g…

题意: 给出一个具有N个点的树,现在给出两种操作: 1.get x,表示询问以x作为根的子树中,1的个数. 2.pow x,表示将以x作为根的子树全部翻转(0变1,1变0). 思路:dfs序加上一个线段树区间修改查询. AC代码: #include<iostream>#include<vector>#include<string.h>using namespace std;const int maxn=2e5+5;int sum[maxn<<2],lazy[…

Problem Description In the game of DotA, Pudge’s meat hook is actually the most horrible thing for most of the heroes. The hook is made up of several consecutive metallic sticks which are of the same length.Now Pudge wants to do some operations on th…

Description The citizens of Bytetown, AB, could not stand that the candidates in the mayoral election campaign have been placing their electoral posters at all places at their whim. The city council has finally decided to build an electoral wall for…

Description The citizens of Bytetown, AB, could not stand that the candidates in the mayoral election campaign have been placing their electoral posters at all places at their whim. The city council has finally decided to build an electoral wall for…

http://poj.org/problem?id=2528 https://www.luogu.org/problem/UVA10587 Description The citizens of Bytetown, AB, could not stand that the candidates in the mayoral election campaign have been placing their electoral posters at all places at their whim…

题目链接:http://poj.org/problem?id=2528 给你n块木板,每块木板有起始和终点,按顺序放置,问最终能看到几块木板. 很明显的线段树区间更新问题,每次放置木板就更新区间里的值.由于l和r范围比较大,内存就不够了,所以就用离散化的技巧 比如将1 4化为1 2,范围缩小,但是不影响答案. 写了这题之后对区间更新的理解有点加深了,重点在覆盖的理解(更新左右两个孩子节点,然后值清空),还是要多做做题目. #include <iostream> #include <cst…

题意  给出一段初始化全为1的区间  后面可以一段一段更改成 1 或 2 或3 问最后整段区间的和是多少 思路:标准线段树区间和模版题 #include<cstdio> #include<algorithm> #include<set> #include<vector> #include<cstring> #include<iostream> using namespace std; ; struct Node{ int l,r,su…