题目描述 Having decided to invest in renewable energy, Byteasar started a solar panels factory. It appears that he has hit the gold as within a few days  clients walked through his door. Each client has ordered a single rectangular panel with specified w…

题目链接 BZOJ3834 题解 容易想到对于\(gcd(x,y) = D\),\(d\)的倍数一定存在于两个区间中 换言之 \[\lfloor \frac{a - 1}{D} \rfloor < \lfloor \frac{b}{D} \rfloor\] \[\lfloor \frac{c - 1}{D} \rfloor < \lfloor \frac{d}{D} \rfloor\] 整除分块即可做到\(O(n\sqrt{max\{b\}})\) #include<algorithm&…

问题相当于找到一个最大的k满足在$[x_1,x_2]$,$[y_1,y_2]$中都有k的倍数 等价于$\frac{x_2}{k}>\frac{x_1-1}{k}$且$\frac{y_2}{k}>\frac{y_1-1}{k}$ 注意到这只有$O(\sqrt{n})$种取值,于是可以分段计算,做到$O(\sqrt{n})$每次询问 #include<cstdio> int T,a,b,c,d,i,j,t; inline void up(int&a,int b){if(a>…

[BZOJ3834][Poi2014]Solar Panels Description Having decided to invest in renewable energy, Byteasar started a solar panels factory. It appears that he has hit the gold as within a few days  clients walked through his door. Each client has ordered a si…

3834: [Poi2014]Solar Panels Time Limit: 20 Sec  Memory Limit: 128 MBSubmit: 367  Solved: 285[Submit][Status][Discuss] Description Having decided to invest in renewable energy, Byteasar started a solar panels factory. It appears that he has hit the go…

题目描述 Having decided to invest in renewable energy, Byteasar started a solar panels factory. It appears that he has hit the gold as within a few days  clients walked through his door. Each client has ordered a single rectangular panel with specified w…

http://www.lydsy.com/JudgeOnline/problem.php?id=3834 题意:求$max\{(i,j)\}, smin<=i<=smax, wmin<=i<=wmax$,其中$smin<=smax<=10^9, wmin<=wmax<=10^9$,有$N<=1000$组数据 #include <bits/stdc++.h> using namespace std; int main() { int cs,…

题目大意: $T(T\le1000)$组询问,每次给出$A,B,C,D(A,B,C,D\le10^9)$,求满足$A\le x\le B,C\le y\le D$的最大的$\gcd(x,y)$. 思路: 令$n=\gcd(x,y)$,则若$n$为合法的答案,当且仅当$\lfloor\frac{A-1}n\rfloor<\lfloor\frac Bn\rfloor,\lfloor\frac{C-1}n\rfloor<\lfloor\frac Dn\rfloor$. 考虑数论分块,每次用块内最大值…

题意 询问两个区间[smin,smax],[wmin,smax]中是否存在k的倍数,使得k最大 分析 将其转化成\([\frac{smin-1}k,\frac{smax}k],[\frac{wmin-1}k,\frac{wmax}k]\) 用分块思想做,注意到这只有\(O(\sqrt{n})\)种取值,于是可以分段计算,做到\(O(\sqrt{n})\)每次询问 我的理解:每一块为[i,j],j=b/(b/i)表示该块的最右端,而i表示该块的最左端,b在[i,j]上的值b/i相同 trick 代…

首先旋转坐标系,将范围表示成矩形或者射线 如果范围是一条线,则将灯按y坐标排序,y坐标相同的按x坐标排序, 对于y相同的灯,f[i]=min(i,它前面灯发光时刻的第k[i]小值), 线段树维护,$O(n\log n)$ 如果范围是一个矩形,则将灯按x坐标排序,x坐标相同的按y坐标排序, 从左往右.从下到上依次扫描,f[i]=min(i,它左下角灯发光时刻的第k[i]小值), 权值线段树套SBT维护,$O(n\log^2n)$ #include<cstdio> #include<algo…

整除分块枚举... 真的没有想到会这么简单. 要使一个数 \(p\) 满足 条件, 则 存在\(x, y\), \(a<=x \times p<=b\ \&\&\ c<=y \times p <=d\) 把\(p\) 除掉 则 \(\left\lceil\dfrac{a}{p}\right\rceil <=y <=\left\lfloor\dfrac{b}{p}\right\rfloor\) \(\left\lceil\dfrac{c}{p}\right…

题目大意: 给出T组询问,每组询问给出四个数a,b,c,d,每次询问满足a<=x<=b,c<=y<=d的gcd(x,y)的最大值 首先可以想到如果存在gcd(x,y)=k,那么就一定要满足b/k>(a-1)/k&&d/k>(c-1)/k. 而n/k的k取法只有√n种,直接枚举即可. //by zykykyk #include<cstdio> #include<ctime> #include<iostream> #inc…

POI2014题解 [BZOJ3521][Poi2014]Salad Bar 把p当作\(1\),把j当作\(-1\),然后做一遍前缀和. 一个合法区间\([l,r]\)要满足条件就需要满足所有前缀和\(\ge 0\),所有后缀和\(\ge 0\),也就是\(\forall i\in[l,r],sum_i-sum_{l-1}\ge 0,sum_r-sum_{i-1}\ge 0\). 也就是说\(sum_{l-1}\)要是\([l-1,r]\)内的最小值,\(sum_r\)要是\([l-1,r]\…

Search GO 说明:输入题号直接进入相应题目,如需搜索含数字的题目,请在关键词前加单引号 Problem ID Title Source AC Submit Y 1000 A+B Problem 10983 18765 Y 1036 [ZJOI2008]树的统计Count 5293 13132 Y 1588 [HNOI2002]营业额统计 5056 13607 1001 [BeiJing2006]狼抓兔子 4526 18386 Y 2002 [Hnoi2010]Bounce 弹飞绵羊 43…

  Indian scientists have designed a new device they hope will solve one of the biggest problems with the use of solar energy. 印度科学家设计了一种新的设备,希望能够解决一个太阳能利用中的最大问题.   They call the device a solar tree. 他们将设备称之为太阳能树.   Solar trees have metal "branches&qu…

Skyscrapers Covered in Solar Panels An office tower on Miller Stree in Manchester is completely covered in solar panels. 曼彻斯特米勒大街上的一座办公大楼完全被太阳能电池板覆盖. They are used to create some of the energy used by the insurance company inside. 他们被用来制造大楼内部保险公司使用的部…

Nexiq 125032 usb link is Diesel Truck diagnostic Interface. Nexiq truck scanner can compatible with 17 software. Below auto diagnostic obd sharing Tips of Nexiq wireless adapter Nexiq 125032 usb link update. Many individuals will probably be interest…

Manoeuvring a satellite in orbit usually requires thrusters. Sometimes the thrust is provided by a fuel-burning rocket motor. Sometimes it comes from electrically heated gas. Both methods, though, add weight in the form of propellant, thus reducing l…

https://www.ted.com/talks/tabetha_boyajian_the_most_mysterious_star_in_the_universe/transcript00:12Extraordinary claims require extraordinary evidence, and it is my job, my responsibility, as an astronomer to remind people that alien hypotheses[haɪˈp…

This is the view from the instrument deployment camera of InSight, America’s latest probe to Mars, which landed safely on November 26th. InSight joins one, or possibly two, other missions now operating on the Martian surface (an American rover called…

1. 主页:http://log4cpp.sourceforge.net“Log4cpp is library of C++ classes for flexible logging to files, syslog, IDSA and other destinations. It is modeled after the Log4j Java library, staying as close to their API as is reasonable.” api文档地址:http://log…

In particular embodiments, a method includes, from an indexer in a sensor network, accessing a set of sensor data that includes sensor data aggregated together from sensors in the sensor network, one or more time stamps for the sensor data, and metad…

很多觉得自己英语成绩还行的同学经常在自己的文章里用一些浮夸或者是难度特别大的词语,以显示自己的英语水平.当然了,成功了倒也无可厚非,要是有些词语用错了那可是会被别人笑掉大牙的.因此英语中的精准用词就成了留学生大问题了.下面就和小编来看看要怎么增强用词的准确性. 先来看个例子: Enter Stregato the self-named assidious low-profile who had a late start of English-learning odyssey where mult…

很多海外留学生在Essay写作时往往不善于对单词进行变化,不能将同一个意思用不同的方式表达出来,使得Essay显得单调乏味最终拿不到高分.小编建议大家应该尽量减少Essay写作中的重复用词.本文将为大家介绍这几种方法减少重复用词,实现用词多样化: 方法一:同义词替换 这是最简单的一种替换方法,当句子或段落中一个词出现太多次时,我们可以用单词的同义词来替换.举两个<经济学人>的例子: Just as drones can make up for poor roads,the theory goe…

A. Radio Prize All boring tree-shaped lands are alike, while all exciting tree-shaped lands are exciting in their own special ways.What makes Treeland more exciting than the other tree-shaped lands are the raddest radio hosts in the local area: Roota…

初等数论学习笔记 I:同余相关. 初等数论学习笔记 II:分解质因数. 1. 数论函数 本篇笔记所有内容均与数论函数相关.因此充分了解各种数论函数的名称,定义,符号和性质是必要的. 1.1 相关定义 数论函数:定义域为正整数的函数称为 数论函数.因其在所有正整数处均有定义,故可视作数列.OI 中常见的数论函数的陪域(即可能的取值范围)为整数. 加性函数:若对于任意 \(a, b\in \mathbb{N}_+\) 且 \(a\perp b\) 均有 \(f(ab) = f(a) + f(b)\)…

3524: [Poi2014]Couriers Time Limit: 20 Sec  Memory Limit: 256 MBSubmit: 1892  Solved: 683[Submit][Status][Discuss] Description 给一个长度为n的序列a.1≤a[i]≤n.m组询问,每次询问一个区间[l,r],是否存在一个数在[l,r]中出现的次数大于(r-l+1)/2.如果存在,输出这个数,否则输出0. Input 第一行两个数n,m.第二行n个数,a[i].接下来m行,…

solar system by HTML5 星际穿越感觉很炫酷啊,网易貌似做了个专题在朋友圈挺火的.用canvas模拟太阳系,嗯,不错昂! 代码及效果 See the Pen GgpRjN by NancyChan (@NancyChan) on CodePen. 其实很常见的示例代码,不过为了熟悉基础还是自己动手写写,需要注意的是 globalCompositeOperation的用法,验证了下就理解了. CanvasRenderingContext2D.globalCompositeOper…

Bootstrap 面板(Panels).面板组件用于把 DOM 组件插入到一个盒子中.创建一个基本的面板,只需要向 <div> 元素添加 class .panel 和 class .panel-default 即可,如下面的实例所示: <!DOCTYPE html> <html> <head> <title>Bootstrap 实例 - 默认的面板</title> <link href="/bootstrap/css…

参考文章:Spring MVC 3 深入总结: 第二章 Spring MVC入门 —— 跟开涛学SpringMVC 参考博客:http://www.cnblogs.com/liukemng/category/578644.html controller层配置文件介绍: 一.springmvc 配置: 具体原理参考文章:  Spring MVC 3 深入总结 web.xml配置文件如下: <!-- Spring MVC 控制器 --> <servlet> <servlet-na…