/* LCT管子题(说的就是你 水管局长) 首先能得到一个结论, 那就是当且仅当所有联通块都是偶数时存在构造方案 LCT动态加边, 维护最小生成联通块, 用set维护可以删除的边, 假如现在删除后不影响全都是偶数大小的性质 就删除 不清楚link为啥要makeroot两次 */ #include<cstdio> #include<algorithm> #include<cstring> #include<iostream> #include<queue…

CF603E Pastoral Oddities 度数不好处理.转化题意:不存在连通块为奇数时候就成功了(自底向上调整法证明) 暴力:从小到大排序加入.并查集维护.全局变量记录奇数连通块的个数 答案单调不增? 类似整体二分.(其实类似决策单调性) 横纵劈开,提前加入不会影响的边,复杂度得以保证 按秩合并并查集撤销 值域的访问,不用每次排序,答案一定是某个边的边权,提前排好序.直接访问即可 #include<bits/stdc++.h> #define reg register int #def…

[CF603E]Pastoral Oddities 题意:有n个点,依次加入m条边权为$l_i$的无向边,每次加入后询问:当前图是否存在一个生成子图,满足所有点的度数都是奇数.如果有,输出这个生成子图中边权最大的边的权值最小可能是多少. $n\le 10^5,m\le 10^6,l_i\le 10^9$ 题解:可以证明如果存在一个生成子图满足所有点度数都是奇数,当且仅当所有连通块都有偶数个点.并且可以知道加边一定不会使答案更劣.正解有三种:1.LCT维护最小生成树:2.cdq分治(类似整体二分)…

Portal Description 初始时有\(n(n\leq10^5)\)个孤立的点,依次向图中加入\(m(m\leq3\times10^5)\)条带权无向边.使得图中每个点的度数均为奇数的边集是合法的,其权值定义为集合中的最大边权.每次加入边后,询问权值最小的合法边集的权值,不存在合法边集时输出\(-1\). Solution 存在合法边集 \(\Leftrightarrow\) 每个连通块的大小均为偶数.如果某连通块大小为奇数,那么该块的总度数是奇数,但一条无向边会提供两个度数,所以不存…

传送门:http://codeforces.com/problemset/problem/603/E [题目大意] 给出$n$个点,$m$个操作,每个操作加入一条$(u, v)$长度为$l$的边. 对于每次操作后,求出一个边集,使得每个点度数均为奇数,且边集的最大边最小. $n \leq 10^5, m \leq 3 * 10^5$ [题解] 有结论:满足条件(每个点度数均为奇数),当且仅当每个连通块大小都是偶数(容易证明,从下往上,调整法). 那么显然可以LCT维护连通性,连通块大小以及最大边…

首先,一个神奇的结论:一个合法的方案存在的条件是每一个联通块的节点数都是偶数个的. 这个可以用数学归纳法简单证一证. 证出这个后,我们只需动态加入每一个边,并查看一下有哪些边能够被删除(删掉后联通块依然合法). 对于维护加边,删边,我们用动态树. 对于枚举哪些边可以被删,我们可以用堆/set来维护. 由于每一条边最多只会加一次,也最多只会删一次,所以总时间复杂度为 $O(nlogm)$. #include <cstdio> #include <queue> #include <…

英文原文在此:http://www.satzansatz.de/cssd/onhavinglayout.htm 介绍 Internet Explorer 中有很多奇怪的渲染问题可以通过赋予其“layout”得到解决.John Gallant 和 Holly Bergevin 把这些问题归类为“尺寸bug(dimensional bugs)”,意思是这些 bug 可以通过赋予相应元素某个宽度或高度解决.这便引出关于“layout”的一个问题:为什么它会改变元素的渲染特性,为什么它会影响到元素之间的…

A.Alternative Thinking(思维) 给出一个01串,你可以取反其中一个连续子串,问取反后的01子串的最长非连续010101串的长度是多少. 我们随便翻一个连续子串,显然翻完之后,对于这个连续子串而言,最后的答案一定不会变优.只会对你翻的左端点和右端点相邻的数字产生贡献.我们计左端点为l,右端点为r.而且要想最大化贡献,必须要使得这个a[l]和a[l-1]一样.a[r]和a[r+1]一样.那么我们只要找到可以使这个贡献获得最大时的条件就行了. # include <cstdio>…

第3章 单表选择率(Single Table Selectivity) Selectivity是优化器估算Rows(Cards)的重要依据. /**************************************************************************************************************************************/ 3.1 Getting Started select count(*) from a…

Introduction Add your content here. ISO/IEC 7816 Contact Cards Hardware EMV payment cards Orange Cash PayPass (Contact Interface) The pcsc-scan utility reports: tyson@UmBongo:~$ pcsc_scan PC/SC device scannerV 1.4.17 (c) 2001-2009, Ludovic Rousseau <…

For a long time, Qt has allowed you to decorate your GUIs with CSS’ish style sheets. Inspired by the web, stylesheets are a great way to stylize your Qt GUI, but it seems that few people use them. In this tutorial, we’ll create an example dialog in Q…

原版的:http://www.koboldtouch.com/display/IDCAR/Four+Ways+of+Scrolling+with+Cocos2D There are two classes of scrolling, "fake" and "real". Altogether there are four ways to create a scrolling view in Cocos2D: with CCCamera, with CCFollow,…

还是从会话管理说起 上一章,Session经过预创建.认证之后,才正常可用.认证时,最重要的操作,就是将Session加入到路由表,使之拥用了通信功能. 添加到至路由表的操作,是在SessionManager中操作的,如下: SessionManager.addSession(LocalClientSession session): public void addSession(LocalClientSession session) { // Add session to the routing…

C. The Intriguing Obsession time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output — This is not playing but duty as allies of justice, Nii-chan! — Not allies but justice itself, Onii-chan! With h…

C. The Intriguing Obsession time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output — This is not playing but duty as allies of justice, Nii-chan! — Not allies but justice itself, Onii-chan! With h…

A. Base $i - 1$ Notation 两个性质: $2=1100$ $122=0$ 利用这两条性质实现高精度加法即可. 时间复杂度$O(n)$. #include<stdio.h> #include<iostream> #include<string.h> #include<string> #include<ctype.h> #include<math.h> #include<set> #include<…

注:从进入生信领域到现在,已经过去快8年了.生物信息学包含了我最喜欢的三门学科:生物学.计算机科学和数学.但是如果突然问起,什么是生物信息学,我还是无法给出一个让自己满意的答案.于是便有了这篇博客. 起源 据说在1970年,荷兰科学家Paulien Hogeweg和Ben Hesper最早在荷兰语中创造了"bioinformatica"一词,英语中的"bioinformatics" 在1978年首次被使用.这两位科学家当时使用该词来表示: The study of…

— This is not playing but duty as allies of justice, Nii-chan! — Not allies but justice itself, Onii-chan! With hands joined, go everywhere at a speed faster than our thoughts! This time, the Fire Sisters — Karen and Tsukihi — is heading for somewher…

Even if the world is full of counterfeits, I still regard it as wonderful. Pile up herbs and incense, and arise again from the flames and ashes of its predecessor — as is known to many, the phoenix does it like this. The phoenix has a rather long lif…

js实现复制到剪贴板 document.createRange() API 选中元素→range→selection是一一对应的,即选区必须连续,不可以有分开的多个区域.另外,被选元素必须在dom树上,不可以是游离元素,并且实践发现display不能为none,visibility不能为hidden,即使不需要渲染.也就是说我可以创建一个游离元素,插入dom树,选择后copy,然后立刻从dom树移出,整个过程都在浏览器下一次渲染之前,所以页面上没有任何变化. 为了实现选中分开的三列table,最…

A. The Artful Expedient time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Rock... Paper! After Karen have found the deterministic winning (losing?) strategy for rock-paper-scissors, her broth…

http://unixpapa.com/js/mouse.html Javascript Madness: Mouse Events Jan WolterAug 12, 2011 Note: I have stopped updating this page. At this point nearly all popular browsers are have achieved a good level of compatibility on most of these features, an…

Even if the world is full of counterfeits, I still regard it as wonderful. Pile up herbs and incense, and arise again from the flames and ashes of its predecessor — as is known to many, the phoenix does it like this. The phoenix has a rather long lif…

转:https://googleprojectzero.blogspot.com/2017/12/apacolypse-now-exploiting-windows-10-in_18.html aPAColypse now: Exploiting Windows 10 in a Local Network with WPAD/PAC and JScript by Ivan Fratric, Thomas Dullien, James Forshaw and Steven Vittitoe Int…

数据类型和定义 ------------------------------------------------------------------------------------------------ 1. Null是个对象 JavaScript众多类型中有个Null类型,它有个唯一的值null, 即它的字面量,定义为完全没有任何意义的值.其表现得像个对象,如下检测代码: alert(typeof null); //弹出 'object' 如下截图: 尽管typeof值显示是"objec…

— This is not playing but duty as allies of justice, Nii-chan! — Not allies but justice itself, Onii-chan! With hands joined, go everywhere at a speed faster than our thoughts! This time, the Fire Sisters — Karen and Tsukihi — is heading for somewher…

<Item 36> Never redefine an inherited non-virtual function 1.如下代码通过不同指针调用同一个对象的同一个函数会产生不同的行为The reason for this two-faced behavior is that non-virtual functions like B::mf and D::mf are statically bound (see Item 37). That means that because pB is d…

转:https://comsecuris.com/blog/posts/vmware_vgpu_shader_vulnerabilities/ Wandering through the Shady Corners of VMware Workstation/Fusion Fri, Sep 15, 2017 Nico, Ralf vmware, hypervisor, reverse engineering, vgpu, vulnerabilities, software security Ba…

C. The Intriguing Obsession time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output — This is not playing but duty as allies of justice, Nii-chan! — Not allies but justice itself, Onii-chan! With h…

B. The Eternal Immortality time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Even if the world is full of counterfeits, I still regard it as wonderful. Pile up herbs and incense, and arise ag…