cell | 易学教程

iText的用法

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一直以来想总结下项目中用到的 itext ，无意中发现了这篇文章，总结的比较好，所以一、前言　　在企业的信息系统中，报表处理一直占比较重要的作用，本文将介绍一种生成 PDF 报表的 Java 组件 --iText 。通过在服务器端使用 Jsp 或 JavaBean 生成 PDF 报表，客户端采用超级连接显示或下载得到生成的报表，这样就很好的解决了 B/S 系统的报表处理问题。　　二、 iText 简介　　 iText 是著名的开放源码的站点 sourceforge 一个项目，是用于生成 PDF 文档的一个 java 类库。通过 iText 不仅可以生成 PDF 或 rtf 的文档，而且可以将 XML 、 Html 文件转化为 PDF 文件。　　 iText 的安装非常方便，在 http://www.lowagie.com/iText/download.html - download 网站上下载 iText.jar 文件后，只需要在系统的 CLASSPATH 中加入 iText.jar 的路径，在程序中就可以使用 iText 类库了。　　三、建立第一个 PDF 文档　　用 iText 生成 PDF 文档需要 5 个步骤：　　①建立 com.lowagie.text.Document 对象的实例。 Document document = new Document();

使用修改版Dancing link X （舞蹈链）求解aquarium游戏

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　　如果把舞蹈表的所有行的消除条件，改成覆盖总值达到n后消除，而不是覆盖总值达到1后消除，并且覆盖的行值也不是1，那会怎么样？　　就变成了多值覆盖游戏！（其实这不就是舞蹈链的重复覆盖特殊情况了嘛）　　正好这里有个游戏要解： https://www.puzzle-aquarium.com/ 里面的aquarium游戏，规则是： 1、游戏棋盘被分成几块，每块被称为一个“水箱” 2、游戏中你可以给每个水箱灌一些水，也可以让它空着 3、同一个水箱内的水位是等高的。也即同一水箱内的同一行的单元格，要么都有水，要么都空着。 4、棋盘外面的数字是该行或该列，灌水的单元格总数。　　说白了，每行每列所占的方格数必须正好等于右侧上面标明的限制数；同水箱内所有最高方格互相之间必须等高；同水箱内最高方格与最低方格内的所有方格必须全部填满。　　如下所示：图1.ID为69,467的谜面答案示例　　这里同水箱有固定不同的方格排布，可以事先把不同高度的排布在横竖方向上的占有数量记录下来；像上图左下角有个水箱，对应到排布就是：　　0分布；第9行有5个，第0列有1个，第1列有1个，第2列有1个，第3列有1个，第4列有1个；第8行有1个，第9行有5个，第0列有1个，第1列有2个，第2列有1个，第3列有1个，第4列有1个。　　舞蹈表的列可以这样设计：不同的水箱占据；不同行的横方向方格占据数量

HOG：从理论到OpenCV实践

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OpenCV HOGDescriptor 参数图解原文链接一、理论 1、 HOG特征描述子的定义： locally normalised histogram of gradient orientation in dense overlapping grids，即局部归一化的梯度方向直方图，是一种对图像局部重叠区域的密集型描述符, 它通过计算局部区域的梯度方向直方图来构成特征。 2、本质： Histogram of Oriented Gradient descriptors provide a dense overlapping description of image regions ，即统计图像局部区域的梯度方向信息来作为该局部图像区域的表征。 3、OpenCV中的HOG算法来源： Histograms of Oriented Gradients for Human Detection , CVPR 2005。详细的算法可以参考这个文章。这里是英文和中文的介绍。 4、检测窗口Win、块Block、单元格Cell的基本信息 (1)大小： A、检测窗口：WinSize=128*64像素，在图像中滑动的步长是8像素(水平和垂直都是) B、块：BlockSize=16*16像素，在检测窗口中滑动的步长是8像素(水平和垂直都是) C、单元格：CellSize=8*8像素

【CodeForces 1272B --- Snow Walking Robot】

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【CodeForces 1272B --- Snow Walking Robot】题目来源：点击进入【CodeForces 1272B — Snow Walking Robot】 Description Recently you have bought a snow walking robot and brought it home. Suppose your home is a cell (0,0) on an infinite grid. You also have the sequence of instructions of this robot. It is written as the string s consisting of characters ‘L’, ‘R’, ‘U’ and ‘D’. If the robot is in the cell (x,y) right now, he can move to one of the adjacent cells (depending on the current instruction). If the current instruction is ‘L’, then the robot can move to the left to (x−1,y); if the current instruction is

codeforces 1272B Snow Walking Robot

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codeforces 1272B Snow Walking Robot 原题地址： https://codeforces.com/problemset/problem/1272/B 题目 Recently you have bought a snow walking robot and brought it home. Suppose your home is a cell (0,0) on an infinite grid. You also have the sequence of instructions of this robot. It is written as the string s consisting of characters ‘L’, ‘R’, ‘U’ and ‘D’. If the robot is in the cell (x,y) right now, he can move to one of the adjacent cells (depending on the current instruction). If the current instruction is ‘L’, then the robot can move to the left to (x−1,y); if the current instruction is ‘R’, then

LeetCode1219. 黄金矿工

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1219. Path with Maximum Gold In a gold mine grid of size m * n , each cell in this mine has an integer representing the amount of gold in that cell, 0 if it is empty. Return the maximum amount of gold you can collect under the conditions: Every time you are located in a cell you will collect all the gold in that cell. From your position you can walk one step to the left, right, up or down. You can’t visit the same cell more than once. Never visit a cell with 0 gold. You can start and stop collecting gold from any position in the grid that has some gold. Example 1: Input: grid = [[0,6,0],[5,8,7

Copy cell value to all cells below it

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问题 I don't know how to write a macro that designates a cell within a column as a "master cell" (editable) copy that cells value to all the cells below it in that column, until it reaches a blank/clear formatted cell in column A. So I want it to look at column A to know when to stop copying the cell values in whichever column. That is, Cell "C5" will be a master cell, the macro will copy it's value from "C6:C" but looking at column A's cell values to see if it has nothing in it and there's no

creating an action when tableView cell in swift touched or clicked

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问题 I a tableView class that displays a text in cells. I need to be able to touch/click text in a cell and create an action (display the next table view) based on the text in the cell clicked. Class is as follows: import UIKit class SecondViewController: UIViewController, UITableViewDataSource, UITableViewDelegate { @IBOutlet var tableView: UITableView! let textCellIdentifier = "TextCell" let catRet = XnYCategories.mainCats("sport") override func viewDidLoad() { super.viewDidLoad() tableView

Optimal way for partitioning a cell based shape into a minimal amount of rectangles

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问题 Assume a boolean array like: 1111 1111 1110 1111 1001 Now you need to find the way of arranging the least rectangles of any size to achieve this shape. So, for example, you'd find this: +-++ | |+ | | +-++ + + Where + is a corner of a rectangle and |, - borders of a rectangle. What I thought about doing is starting with the largest possible rectangle, checking if there is any place in the array it can be placed, where every array element covered by the rectangle is true. If such a place exists

First Empty cell in row

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问题 I am copying a range into the next empty cell of a different workbook. the following code; Public Sub InvoicedInstallments() Dim rng1 As Range Dim rng2 As Range Dim rng3 As Range Dim fname As String Dim mt As String, yr As String mt = MonthBox.Value yr = YearBox.Value fname = yr & mt & "DB" & ".xlsx" Set rng1 = Workbooks("201209TB.xlsx").Worksheets("excel").Range("E348") Set rng2 = Workbooks("201209TB.xlsx").Worksheets("excel").Range("E295") Set rng3 = Workbooks(fname).Worksheets("UK monthly

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