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/* 常见的排序算法有：直接插入 希尔 冒泡 快速 选择 堆排序 归并 基数 */ //下面一一分析，并实现： /* 1.冒泡排序 冒泡排序是最简单的排序算法，冒泡排序的基本思想是从后往前（或从前往后）两两比较相邻元素的值，若为逆序，则交换它们，直到序列比较完毕。我 们称它为一趟冒泡。每一趟冒泡都会将一个元素放置到最终的位置上。 */ //从前往后遍历，保证排好序的放到右侧 void BubbleSort_from_0( vector < int > & nums){ int n = nums.size(); //一共进行n-1趟 for ( int i = 0 ; i < n - 1 ; i++){ //注意j的起点和终点 for ( int j = 1 ; j < n - i; j++){ if (nums[j] < nums[j - 1 ]){ swap(nums[j], nums[j - 1 ]); } } } } //从后往前遍历，保证排好序的放到左侧 void BubbleSort_from_n( vector < int > & nums){ int n = nums.size(); //一共进行n-1趟 for ( int i = 0 ; i < n - 1 ; i++){ //注意j的起点和终点 for ( int j = n- 1 ; j >i; j--){

一、问题代码 //权限处理 List rootList = perAPI.getPersonRool(per); if (rootList.size() > 0) { ......... ......... } 二、原因分析及修正 1、经分析，getPersonRool（）方法在一定条件下会返回 null 2、问题解决： //权限处理 List rootList = perAPI.getPersonRool(per); //对rootList进行非空校验,利用 && 的短路特性 if (rootList != null && rootList.size() > 0) { ......... ......... } 来源： https://blog.csdn.net/qq_35808136/article/details/102723032

I tried it this way, but it doesn't work - the returned values from getmaxyx remain always the same. #!/usr/bin/env perl use warnings; use 5.012; use Curses; my $size_changed = 0; $SIG{'WINCH'} = sub { $size_changed= 1; }; initscr(); my ( $row, $col ); getmaxyx( $row, $col ); addstr( "begin: $row - $col\n" ); refresh(); for ( 0 .. 19 ) { addstr( "-------------\n" ); if ( $size_changed ) { getmaxyx( $row, $col ); addstr( "new: $row - $col\n" ); $size_changed = 0; } refresh(); sleep 1; } sleep 3; endwin(); #!/usr/bin/env perl use warnings; use 5.012; use Curses; my $size_changed = 0; $SIG{'WINCH

I have a div that contain many images: <div id="#preview_images_gallery"> <img class="image_url pager" src="image1.jpg"> <img class="image_url pager" src="image2.jpg"> <img class="image_url pager" src="image3.jpg"> . . . </div> how I can know the number of images contained in this div with jquery? $("#preview_images_gallery > img").size() on second thoughts $("#preview_images_gallery > img").length $('#preview_images_gallery > img').length var imagecount = $('#preview_images_gallery img').length the length property of a jQuery collection. Note : you should change your div id from #preview

here's my problem: How can get the displayed size of the drawable inside an ImageView in pixel after scalling, assuming that the ImageView size isn't equal to the scaled drawable? A lot of methods just return the original size of the Drawable or just the size of the ImageView. Here is a picture describing what I want : http://image.noelshack.com/fichiers/2013/06/1360144144-sans-titre.png 1 --> ImageView Size 2 --> The scaled image size that I want to get in px Thank you. From the image you posted I assume you have scaleType of FIT_CENTER (or CENTER_INSIDE with drawable bigger than imageView)

Generally we declare the array in following format: DataType array_name[SIZE]; SO If I tried creating 0 length array for e.g. int arr[0]; //Line#1 arr[0] = 5; //Line#2 I do not get any error when above code is executed.In this case is memory allocated for single integer? Why does the Line#1 not generate any compilation error? Ideally, it should! It is not legal code to create an array of size 0 on local storage. Ideally, the compiler should issue you an error, probably some compiler extension allows this to compile but as per the standard this is not a valid code.Try compiling with -pedantic .