#include <stdlib.h> #include <math.h> #include <iostream> #define MAXN 1000 #define offset 10000 #define eps 1e-8 #define zero(x) (((x)>0?(x):-(x))<eps) #define _sign(x) ((x)>eps?1:((x)<-eps?2:0)) struct point{ double x, y; }…

顿时觉得神清气爽!! #include <iostream> #include <math.h> #define eps 1e-8 #define zero(x) (((x)>0?(x):-(x))<eps) #define pi acos(-1.0) struct point { double x,y; }; struct line { point a,b; }; struct point3 { double x,y,z; }; struct line3 { poin…

矩形重叠 看过某司一道笔试题:给\(n\)个矩形左下和右上坐标(不能斜放),求重叠最多处矩形个数. 这道题本身不难:可以遍历所有矩形边界组成的点,计算该点被多少矩形包围,从而选出最大值. 由此引申出一个问题:判断两个矩形重叠. 如果正向思考,会有很多种情况:包含.重叠某个角.交叉... 那么如果逆向思考:什么情况两个矩形不重叠?无非就是\(A(p_1, p_2)\)在\(B(p_3, p_4)\)的上下左右: \[(p_2.y>=p_3.y)\vee(p_4.y>=p_1.y)\vee(p_3…

1 Introduction The goal of the circular kernel is to offer to the user a large set of functionalities on circles and circular arcs in the plane. All the choices (interface, robustness, representation, and so on) made here are consistent with the choi…

1 Introduction CGAL, the Computational Geometry Algorithms Library, is written in C++ and consists of three major parts. The first part is the kernel, which consists of constant-size non-modifiable geometric primitive objects and operations on these…

在不是Ubuntu系统下安装OpenFoam,需要采用编译安装的方式.以下以OpenSuSE为例进行编译安装. 1 软件包准备 需要下载两个程序包: OpenFOAM-4.x-version-4.1.tar.gzThirdParty-4.x-version-4.1.tar.gz 2 安装GCC 启动终端Konsole,在终端中输入命令: sudo zypper install gcc 按提示输入密码并确认安装后,系统自动从网络上下载gcc并进行安装.安装完毕后利用终端命令测试gcc安装版本: g…

    Programming Contest Problem Types Hal Burch conducted an analysis over spring break of 1999 and made an amazing discovery: there are only 16 types of programming contest problems! Furthermore, the top several comprise almost 80% of the problems s…

中国计算机学会推荐国际学术会议 (计算机系统与高性能计算) 一.A类 序号 会议简称 会议全称 出版社 网址 1 ASPLOS Architectural Support for Programming Languages and Operating Systems ACM http://www.acm.org/pubs/contents/proceedings/series/asplos 2 FAST Conference on File and Storage Technologies US…

Visulalize Boost Voronoi in OpenSceneGraph eryar@163.com Abstract. One of the important features of the boost polygon library is the implementation of the generic sweepline algorithm to construct Voronoi diagrams of points and linear segments in 2D(d…

Visulalization Voronoi in OpenSceneGraph eryar@163.com Abstract. In mathematics a Voronoi diagram is a way of dividing space into a number of regions. A set of points, called seeds, sites, or generators is specified beforehand and for each seed there…