排序算法是編程的基礎(chǔ)葛作。
常見(jiàn)的四種排序算法是：簡(jiǎn)單選擇排序、冒泡排序猖凛、插入排序和快速排序赂蠢。其中的快速排序的優(yōu)勢(shì)明顯，一般使用遞歸方式實(shí)現(xiàn)辨泳，但遇到數(shù)據(jù)量大的情況則無(wú)法適用虱岂。實(shí)際工程中一般使用“非遞歸”方式實(shí)現(xiàn)。本文搜集發(fā)布四種算法的源代碼及非遞歸快速排序的代碼菠红。
快速排序(Quick Sort)算法(遞歸方式)
快速排序的思想是分治法 (Divide-and-ConquerMethod)量瓜。先從數(shù)列中取出一個(gè)數(shù)作為基準(zhǔn)數(shù)。分區(qū)過(guò)程途乃，將比這個(gè)數(shù)大的數(shù)全放到它的右邊，小于或等于它的數(shù)全放到它的左邊扔傅。再對(duì)左右區(qū)間重復(fù)第二步耍共，直到各區(qū)間只有一個(gè)數(shù)。
代碼改編自：C#實(shí)現(xiàn)常見(jiàn)排序算法_菜園赤子的博客-CSDN博客_c#排序算法
代碼：
using System;
using System.Text;
using System.Collections.Generic;
using System.Windows.Forms;
namespace WindowsFormsApp6
{
???public partial class Form1 : Form
??? {
???????Random rnd = new Random((int)DateTime.Now.Ticks);
???????List slides = new List();
???????public Form1()
???????{
???????????InitializeComponent();
???????}
???????private void Form1_Load(object sender, EventArgs e)
???????{
???????????this.Text = "C#猎塞，四種常見(jiàn)排序算法的可視化編程——北京聯(lián)高軟件開(kāi)發(fā)有限公司";
???????????button1.Text = "選擇排序"; button1.Cursor = Cursors.Hand;
???????????button2.Text = "冒泡排序"; button2.Cursor = Cursors.Hand;
???????????button3.Text = "插入排序";
button3.Cursor = Cursors.Hand;
???????????button4.Text = "快速(遞歸)"; button4.Cursor = Cursors.Hand;
???????????button5.Text = "快速(非遞歸)"; button5.Cursor = Cursors.Hand;
???????????panel1.Dock = DockStyle.Top;
???????????panel2.Dock = DockStyle.Fill;
???????????webBrowser1.Navigate("http://www.315soft.com");
???????}
???????private int[] RandArray()
???????{
???????????int n = 20;
???????????int[] dataArray = new int[n];
???????????for (int i = 0; i < n; i++)
???????????{
??????????????? dataArray[i] = rnd.Next(20,100);
???????????}
???????????return dataArray;
???????}
???????private void button4_Click(object sender, EventArgs e)
???????{
???????????int[] dataArray = RandArray();
???????????slides.Clear();
???????????QuickSort(dataArray, 0, dataArray.Length - 1);
???????????loop = 0;
???????????timer1.Interval = 100;
???????????timer1.Enabled = true;
???????}
???????///
???????///快速排序（遞歸）
???????///改編自：https://blog.csdn.net/qq_36238093/article/details/97051032
???????///源代碼有明顯的 BUG
???????///
???????///
???????///
???????///
???????public void QuickSort(int[] dataArray, int left, int right)
???????{
???????????int i = left;
???????????int j = right;
???????????int temp = dataArray[left];
???????????if (left >= right)
???????????{
??????????????? return;
???????????}
???????????while (i != j)
???????????{
??????????????? while (i < j &&dataArray[j] >= temp)
??????????????? {
??????????????????? j--;
??????????????? }
??????????????? if (j > i)
??????????????? {
??????????????????? dataArray[i] =dataArray[j];
??????????????? }
??????????????? while (i < j &&dataArray[i] <= temp)
??????????????? {
??????????????????? i++;
??????????????? }
??????????????? if (i < j)
??????????????? {
??????????????????? dataArray[j] =dataArray[i];
??????????????? }
??????????????? slides.Add(Slide(button4.Text,dataArray, i, j));
???????????}
???????????dataArray[i] = temp;
???????????//下面兩句源代碼有錯(cuò)誤试读！
???????????if (i > 0) QuickSort(dataArray, left, i - 1);
???????????if ((i + 1) < dataArray.Length) QuickSort(dataArray, i + 1, right);
???????}
???????private string Slide(string title, int[] dataArray, int a, int b)
???????{
???????????StringBuilder sb = new StringBuilder();
???????????sb.AppendLine("");
???????????sb.AppendLine("");
???????????sb.AppendLine("");
???????????sb.AppendLine("");
???????????sb.AppendLine("td {vertical-align:bottom;text-align:center;font-size:12px; } ");
???????????sb.AppendLine(".bar {width:" + (int)((webBrowser1.Width - dataArray.Length * 11) /dataArray.Length) + "px;font-size:12px;border:solid 1px#FF6701;background-color:#F08080;text-align:center;border-radius:3px; }");
???????????sb.AppendLine("");
???????????sb.AppendLine("");
???????????sb.AppendLine("");
???????????sb.AppendLine("");
???????????sb.AppendLine("");
???????????sb.AppendLine("方法：" + title +
"</td>");
???????????sb.AppendLine("數(shù)據(jù)：" +
dataArray.Length + "</td>");
???????????sb.AppendLine("步驟：[0]</td>");
???????????sb.AppendLine("");
???????????sb.AppendLine("");
???????????sb.AppendLine("
");
???????????sb.AppendLine("");
???????????sb.AppendLine("");
???????????for (int i = 0; i < dataArray.Length; i++)
???????????{
??????????????? if (i == a || i == b)
??????????????? {
??????????????????? sb.AppendLine(""+ dataArray[i] + "
");??????????????? }
??????????????? else
??????????????? {
???????????????????sb.AppendLine("" + dataArray[i] + "");
??????????????? }
???????????}
???????????sb.AppendLine("");
???????????sb.AppendLine("");
???????????sb.AppendLine("");
???????????sb.AppendLine("");
???????????return sb.ToString();
???????}
???????int loop = 0;
???????private void timer1_Tick(object sender, EventArgs e)
???????{
???????????if (loop < slides.Count + (3000 / timer1.Interval))
???????????{
??????????????? if (loop < slides.Count)
???????????????{
??????????????????? webBrowser1.DocumentText =slides[loop].Replace("[0]", loop + " / " + slides.Count);
??????????????????? loop++;
??????????????????? return;
??????????????? }
??????????????? loop++;
??????????????? return;
???????????}
?? ?????????loop = 0;
???????}
??? }
}
可下載排序算法源代碼練習(xí)。
