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Making A Circle Out Of Squares

方形画圆 解决方案: 循环偏移5角度画方形 效果图: Python 源码 import turtle; window = turtle.Screen(); window.bgcolor("pink") def draw_circle(): square = turtle.Turtle(); square.shape("turtle"); square.color("blue"); square.speed(-3); max_rot = 360;…

Modified Least Square Method and Ransan Method to Fit Circle from Data

In OpenCv, it only provide the function fitEllipse to fit Ellipse, but doesn't provide function to fit circle, so i read some paper, and write a function to do it. The paper it refer to is "A Few Methods for Fitting Circles to Data". Also when t…

[LeetCode] Word Squares 单词平方

Given a set of words (without duplicates), find all word squares you can build from them. A sequence of words forms a valid word square if the kth row and column read the exact same string, where 0 ≤ k < max(numRows, numColumns). For example, the wor…

[翻译svg教程]svg中的circle元素

svg中的<circle> 元素,是用来绘制圆形的,例如 <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"> <circle cx="40" cy="40" r="24" style="stroke:#006600; fill:#00cc00"…

卡通图像变形算法（Moving Least Squares）附源码

本文介绍一种利用移动最小二乘法来实现图像变形的方法,该方法由用户指定图像中的控制点,并通过拖拽控制点来驱动图像变形.假设p为原图像中控制点的位置,q为拖拽后控制点的位置,我们利用移动最小二乘法来为原图像上的每个像素点v构建相应的仿射变换lv(x),并通过该变换来计算得到图像变形后的位置: 其中权重wi的表达式为wi = 1/|pi - v|2α. 仿射变换lv(x)由两部分组成lv(x) = xM + T,其中M为线性转换矩阵,T为平移量.事实上将最小化表达式对变量T求偏导后可以得到T的表达式T…

设计一个程序，程序中有三个类，Triangle，Lader，Circle。

//此程序写出三个类,triangle,lader,circle:其中triangle类具有类型为double的a,b,c边以及周长,面积属性, //具有周长,面积以及修改三边的功能,还有判断能否构成三角形的boolean类. //lader类具有类型为double的上底下底和高,面积属性,具有返回面积的功能 //circlle 类具有类型为double的半径,周长和面积.具有返回周长面积的功能 //Lader类 class Lader { double shangDi; //上底 double…

Leetcode: Word Squares && Summary: Another Important Implementation of Trie(Retrieve all the words with a given Prefix)

Given a set of words (without duplicates), find all word squares you can build from them. A sequence of words forms a valid word square if the kth row and column read the exact same string, where 0 ≤ k < max(numRows, numColumns). For example, the wor…

c++作业:Circle

Circle Github链接…

[javascript svg fill stroke stroke-width circle 属性讲解] svg fill stroke stroke-width circle 属性 绘制圆形及引入方式讲解

<!DOCTYPE html> <html lang='zh-cn'> <head> <title>Insert you title</title> <meta name='description' content='this is my page'> <meta name='keywords' content='keyword1,keyword2,keyword3'> <meta http-equiv="…

(1)编写一个接口ShapePara，要求： 接口中的方法： int getArea()：获得图形的面积。int getCircumference()：获得图形的周长 (2)编写一个圆类Circle，要求：圆类Circle实现接口ShapePara。 该类包含有成员变量： radius:public 修饰的double类型radius,表示圆的半径。 x：private修饰的double型变量x，

package com.hanqi.test; //创建接口 public interface ShapePara { //获取面积的方法 double getArea(); //获取周长的方法 double getCircumference(); } package com.hanqi.test; public class Circle implements ShapePara { //定义圆心 public double radius; //定义圆心的横向坐标 private double…

东大oj-1591 Circle of friends

题目描述 Nowadays, "Circle of Friends" is a very popular social networking platform in WeChat. We can share our life to friends through it or get other's situation. Similarly, in real life, there is also a circle of friends, friends would often get…

[LintCode] Perfect Squares 完全平方数

Given a positive integer n, find the least number of perfect square numbers (for example, 1, 4, 9, 16, ...) which sum to n. ExampleGiven n = 12, return 3 because 12 = 4 + 4 + 4Given n = 13, return 2 because 13 = 4 + 9 LeetCode上的原题,请参见我之前的博客Perfect Sq…

HDU 1264 Counting Squares（线段树求面积的并）

Counting Squares Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 1885    Accepted Submission(s): 946 Problem Description Your input is a series of rectangles, one per line. Each rectangle is sp…

svg学习（四）circle

<circle> 标签 < <?xml version="1.0" standalone="no"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"> <svg width="100%" height="…

RSS(Residual Sum of Squares)的自由度为什么是n-1呢

[转载请注明出处]http://www.cnblogs.com/mashiqi 在回归问题中,偶尔我们会遇到求方差的估计的情况.举了例子,我们常常通过Gaussian分布${\cal N}(\mu ,{\sigma^2})$的样本集合$\{x_i\}_{i=1}^n$去估计分布的参数$\mu,\sigma^2$.对$\mu$的估计应该大家都很熟悉了:$\hat{\mu}=\bar{x} =\frac{1}{n} \sum_{i=1}^n x_i$,然而,对$\sigma^2$的估计,在教科书中,…

后缀数组 --- WOj 1564 Problem 1564 - A - Circle

Problem 1564 - A - Circle Problem's Link:   http://acm.whu.edu.cn/land/problem/detail?problem_id=1564 Mean: 给你一个长度不超过1e6的数字串,求第k大的环状数字串的前面那个位置. analyse: 好吧,我承认这是个水题,比赛的时候sb了,因为原来做过后缀自动机求解字符串的环状最小表示法,所以一直用后缀自动机的知识去套k小表示法,比赛的时候太固执了. 这题就是后缀数组的sa[]数组的运用,…

poj-3739. Special Squares(二维前缀和)

题目链接: I. Special Squares There are some points and lines parellel to x-axis or y-axis on the plane. If arbitrary chosen two lines parallel to x-axis and two lines parallel to y-axis, one rectangle, or sometimes a square, will be formed. If a square i…

[CareerCup] 7.5 A Line Cut Two Squares in Half 平均分割两个正方形的直线

7.5 Given two squares on a two-dimensional plane, find a line that would cut these two squares in half. Assume that the top and the bottom sides of the square run parallel to the x-axis 这道题给了我们两个正方形,让我们求一条可以讲这两个正方形平均分为两个部分的直线,前提是两个正方形都和x轴平行.那么我们首先要知道…

POJ 2002 Squares

二分.... Squares Time Limit: 3500MS Memory Limit: 65536K Total Submissions: 14530 Accepted: 5488 Description A square is a 4-sided polygon whose sides have equal length and adjacent sides form 90-degree angles. It is also a polygon such that rotating a…

iOS 中使用Block时需要注意的retain circle

现在在ios中,block是越来越多了.自己在类中定义block对象时,需要注意block对象的使用方法,防止产生retain circle,导致内存泄露. 现在分析一下产生retain circle的原因 比如我建立了Tools类,之后 建立了一个strong 类型的 block指针 callbackBlock,作为回掉函数使用. 之后在A类中,建立了Tools类的一个对象,并用Strong指针 aTool指向这个对象,再将它的callbackBlock指针赋值,也就是写出具体的block实现…

Counting Squares[HDU1264]

Counting Squares Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 1072    Accepted Submission(s): 529 Problem DescriptionYour input is a series of rectangles, one per line. Each rectangle is spec…

circle and bar

<!doctype html> <meta charset="utf-8"> <html> <head> <title>D3 tutorial</title> <!-- <script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script> --> <script sr…

random circle

<!doctype html><meta charset="utf-8"><html><head><title>D3 tutorial</title><!--<script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>--><script src="…

LeetCode Perfect Squares

原题链接在这里:https://leetcode.com/problems/perfect-squares/ 题目: Given a positive integer n, find the least number of perfect square numbers (for example, 1, 4, 9, 16, ...) which sum to n. For example, given n = 12, return 3 because 12 = 4 + 4 + 4; given n…

Squares 分类： POJ 2015-08-04 11:46 3人阅读 评论(0) 收藏

Squares Time Limit: 3500MS Memory Limit: 65536K Total Submissions: 17462 Accepted: 6634 Description A square is a 4-sided polygon whose sides have equal length and adjacent sides form 90-degree angles. It is also a polygon such that rotating about it…

V-rep学习笔记：机器人逆运动学数值解法（Damped Least Squares / Levenberg-Marquardt Method）

The damped least squares method is also called the Levenberg-Marquardt method. Levenberg-Marquardt算法是最优化算法中的一种.它是使用最广泛的非线性最小二乘算法,具有梯度法和牛顿法的优点.当λ很小时,步长等于牛顿法步长,当λ很大时,步长约等于梯度下降法的步长. The damped least squares method can be theoretically justified as follo…

poj2986A Triangle and a Circle&&poj3675Telescope（三角形剖分）

链接 2986是3675的简化版,只有一个三角形. 这题主要在于求剖分后三角形与圆的相交面积,需要分情况讨论. 具体可以看此博客 http://hi.baidu.com/billdu/item/703ad4e15d819db52f140b0b 在分析第3.4两种情况时,我是用角度来进行判断的,如果<obc||<ocb大于90度就为他所说的第四种情况,不然就是第三种情况. 还有对于sig的解释貌似网上都没写,可能都觉得太简单了...自己手画了一下,大体是这个样子的 红色标记那块三角形是需要减掉对…

洛谷P1206 [USACO1.2]回文平方数 Palindromic Squares

P1206 [USACO1.2]回文平方数 Palindromic Squares 271通过 501提交 题目提供者该用户不存在 标签USACO 难度普及- 提交  讨论  题解 最新讨论 暂时没有讨论 题目描述 回文数是指从左向右念和从右向左念都一样的数.如12321就是一个典型的回文数. 给定一个进制B(2<=B<=20,由十进制表示),输出所有的大于等于1小于等于300(十进制下)且它的平方用B进制表示时是回文数的数.用’A’,’B’……表示10,11等等 输入输出格式 输入格式: 共…

zoj 1450 Minimal Circle 最小覆盖圆

题目链接:http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemId=450 You are to write a program to find a circle which covers a set of points and has the minimal area. There will be no more than 100 points in one problem. 题意描述:找到一个最小圆能够包含到所有的二维坐标点. 算法…

Codeforces Round #337 (Div. 2) B. Vika and Squares 水题

B. Vika and Squares   Vika has n jars with paints of distinct colors. All the jars are numbered from 1 to n and the i-th jar contains ai liters of paint of color i. Vika also has an infinitely long rectangular piece of paper of width 1, consisting of…