How to Get Vertical Line from Point and Line

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How to Get Vertical Line from Point and Line

Description How to get vertical line cross one point which out of line in line. QPoint Line::VerticalPoint(QPoint pt) { QPointF ptCross = pt; double dtY = static_cast<double>(y1() - y2()); double dtX = static_cast<double>(x1() - x2()); double…

Go to the first line OR the last line of the file

(1) 跳到首行 :1 或 gg (2)跳到最后一行 :$ 或 G 或shift+g(大写.当前若大小写锁定直接按g,未锁定则按shift+g)…

[笔记]The Linux command line

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[LeetCode] Max Points on a Line 题解

题意 Given n points on a 2D plane, find the maximum number of points that lie on the same straight line. 意思就是说在给定的节点中计算出在同一条直线上的最大节点个数. 思路这道题,题意很容易理解,但是需要注意的东西包括,如果你用斜率计算,那么就需要注意到精确度的问题,否则就会变成相等的斜率,无奈之下,只能提高精确度,比如说用long double,但这不是持久的办法,目前的办法是使用最大公约数.…

Detect Vertical&Horizontal Segments By OpenCV

Detect Vertical&Horizontal Segments By OpenCV,and Save the data to csv. Steps: Using adaptiveThreshold to generate thresholded image. Using threshold to find lines. Save the data to csv by convert it to json. # coding=gbk import cv2 import numpy as n…

PAT A 1014. Waiting in Line (30)【队列模拟】

题目:https://www.patest.cn/contests/pat-a-practise/1014 思路: 直接模拟类的题. 线内的各个窗口各为一个队,线外的为一个,按时间模拟出队.入队. 注意点:即使到关门时间,已经在服务中的客户(窗口第一个,接待时间早于关门时间)还是可以被服务的.其它的则不服务. #include<iostream> #include<vector> #include<set> #include<map> #include<…

[CareerCup] 7.6 The Line Passes the Most Number of Points 经过最多点的直线

7.6 Given a two-dimensional graph with points on it, find a line which passes the most number of points. 这道题给了我们许多点,让我们求经过最多点的一条直线.给之前那道7.5 A Line Cut Two Squares in Half 平均分割两个正方形的直线一样,都需要自己写出点类和直线类.在直线类中,我用我们用斜率和截距来表示直线,为了应对斜率不存在情况,我们还需用一个flag来标记是否…

简单几何(直线求交点) POJ 2074 Line of Sight

题目传送门题意:从一条马路(线段)看对面的房子(线段),问连续的能看到房子全部的最长区间分析:自己的思路WA了:先对障碍物根据坐标排序,然后在相邻的障碍物的间隔找到区间,这样还要判断是否被其他障碍物遮挡住(哇网上有很好的思路,先对每条线段找到阴影的端点,然后根据坐标排序,求和左端点的距离的最大值,这样省去线段相交的判断. trick点应该就是障碍物的位置随意,可能在房子和马路的外面. /************************************************ * A…

Jmeter html 报告中添加90% line time

转载南风_real博客园:http://www.cnblogs.com/jaychang/p/5784882.html 首先上效果图: 其次明白几个原理: 90% Line的意思是:一组数由小到大进行排列,找到它的第90%个数: Jmeter html报告生成是使用xxx.jtl文件通过xsl模板生成的,因此要在html报告中显示90% line,就需要修改xsl模板文件(jmeter-results-detail-report_21.xsl) 最后上步骤:1.在jmeter-results-d…

【BZOJ】【3301】【USACO2011 Feb】Cow Line

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1014. Waiting in Line (30)

Suppose a bank has N windows open for service. There is a yellow line in front of the windows which devides the waiting area into two parts. The rules for the customers to wait in line are: The space inside the yellow line in front of each window is…

vbscript multiple line syntax

Vbscript 如何将输出内容换行? ' VbCrLf represetns Carriage return–linefeed combination, for more information see VBscript Constants. WScript.Echo "Line 1 ..." & VbCrLf & "Line 2 ..." ' use an underscore at the end of a line to continue i…

[CC150] Find a line passing the most number of points

Problem: Given a two-dimensional graph with points on it, find a line which passes the most number of points. 此题是Cracking the code 5th edition 第七章第六题,思路就是 n choose 2, 所以时间复杂度是O(n^2),因为没有更快的办法. 此题的难点在于两点一线计算出的斜率是浮点型,不好比较equality.所以其中需要有一个精确到哪一位的概念,英文是…

PAT 1014. Waiting in Line

Suppose a bank has N windows open for service. There is a yellow line in front of the windows which devides the waiting area into two parts. The rules for the customers to wait in line are: The space inside the yellow line in front of each window i…

BZOJ3301: [USACO2011 Feb] Cow Line

3301: [USACO2011 Feb] Cow Line Time Limit: 10 Sec Memory Limit: 128 MBSubmit: 67 Solved: 39[Submit][Status] Description The N (1 <= N <= 20) cows conveniently numbered 1...N are playing yet another one of their crazy games with Farmer John. The co…

java输出换行的标准姿势"line.separator"

java中写.txt文件,实现换行的几种方法: 1.使用java中的转义符"\r\n": windows下的文本文件换行符:\r\n linux/unix下的文本文件换行符:\r Mac下的文本文件换行符:\n 1.String str="aaa"; 2.str+="\r\n"; 2.BufferedWriter的newline()方法: FileOutputStream fos=new FileOutputStream("c;\\11…

Shell split character line by line

Two analytical 2d line intersection in OpenCASCADE

Two analytical 2d line intersection in OpenCASCADE eryar@163.com Abstract. OpenCASCADE geometric tools provide algorithms to calculate the intersection of two 2d curves, surfaces, or a 3d curve and a surface. Those are the basis of the Boolean Operat…

3301: [USACO2011 Feb] Cow Line

3301: [USACO2011 Feb] Cow Line Time Limit: 10 Sec Memory Limit: 128 MBSubmit: 82 Solved: 49[Submit][Status][Discuss] Description The N (1 <= N <= 20) cows conveniently numbered 1...N are playing yet another one of their crazy games with Farmer Joh…

《MATLAB从入门到放弃》二维曲线和图形绘制基础（二）：使用Help文档学习line、plot、plotyy、subplot、hold绘图函数

目录: » plot 最常用的二维曲线绘图函数 > 帮助文档 > 基本使用语法 > 线条的样式.符号和颜色调整 > 图形属性调整 > 使用图形句柄进行设置 » line 点点连线 » subplot 子图绘制 > 子图绘制 > 子图句柄 » plotyy 双纵坐标绘图 > 双纵坐标的绘图 > 双纵坐标的句柄 » hold 图形叠绘写在前面 : MATLAB中函数的学习,一定要学会使用软件自带的Help帮助文档 . 在…

【Git】git rebase报错new blank line at EOF.处理

执行git rebase报错如下: First, rewinding head to replay your work on top of it... Applying: 本次提交信息 .git/rebase-apply/: new blank line at EOF. + warning: line adds whitespace errors. Using index info to reconstruct a base tree... Falling back to patching ba…

shell脚本while read line的使用

#### 题目要求计算文档a.txt中每一行中出现的数字个数并且要计算一下整个文档中一共出现了几个数字.例如a.txt内容如下:12aa*lkjskdjalskdflkskdjflkjj我们脚本名字为 ncount.sh, 运行它时:bash ncount.sh a.txt输出结果应该为:20sum:2 #### 参考答案``` #!/bin/bash sum=0 while read line do line_n=`echo $line|sed 's/[^0-9]//g'|wc -L` ech…

Problem E: 平面上的点和线——Point类、Line类 (V)

Description 在数学上,平面直角坐标系上的点用X轴和Y轴上的两个坐标值唯一确定,两点确定一条线段.现在我们封装一个“Point类”和“Line类”来实现平面上的点的操作. 根据“append.cc”,完成Point类和Line类的构造方法和show()方法,输出各Line对象和Point对象的构造和析构次序. 接口描述: Point::show()方法:按格式输出Point对象. Line::show()方法:按格式输出Line对象. Line::SetLine(double, dou…