交换排序是一类借助于交换元素的值来进行排序的方法,最简单的交换排序是人们熟知的"冒泡排序",另一种是"快速排序",快速排序是对冒泡排序的改进.今天用C#写了两个算法的实现,用的是对于数组的扩展方法.代码贴在下面,方便以后查看.
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Code
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using System;
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namespace Whut.sorting
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{
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class SortClass
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{
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static void Main(string[] args)
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{
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int[] x =
{2,6,52,41,48,57,625 ,321,315,654,564,56465,4564894,13432,13,12,1,5,464,
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3,13,15,4,1321,4,31,315,64,13,1654,31,21,54,1,321,654,1,165,41,3165,4,
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26,59,798,1,4,7132123,16,46,321};
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x.bubbleSort();
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//x.quickSort();
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foreach (var item in x)
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{
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Console.Write(item+" ");
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}
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Console.Read();
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}
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}
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public static class Sorting
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{
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公有方法#region 公有方法
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public static void bubbleSort(this int[] x, int low, int high)
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{
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bool change;
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int lastchange;
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for (int i = high; i > low; i=lastchange)
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{
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change = false;
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lastchange = low;
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for (int j = low; j < i; j++)
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{
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if (x[j] > x[j + 1])
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{
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int temp = x[j];
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x[j] = x[j + 1];
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x[j + 1] = temp;
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change = true;
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lastchange = j;
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}
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}
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if (!change)
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{
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break;
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}
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}
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}
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public static void bubbleSort(this int[] x)
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{
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bubbleSort(x, 0, x.Length - 1);
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}
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public static void quickSort(this int[] x, int low, int high)
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{
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if (low > high)
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{
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return;
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}
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int k = partition(x, low, high);
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quickSort(x, low, k - 1);
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quickSort(x, k + 1, high);
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}
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public static void quickSort(this int[] x)
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{
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quickSort(x, 0, x.GetUpperBound(0));
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}
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#endregion
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私有函数#region 私有函数
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private static int partition(int[] x, int low, int high)
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{
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Random ran = new Random();
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swap(x[low], x[ran.Next(low, high)]);
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int pivotkey = x[low];
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while (low < high)
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{
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while (low < high && x[high] >= pivotkey)
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{
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high--;
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}
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x[low++] = x[high];
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while (low < high && x[low] <= pivotkey)
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{
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low++;
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}
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x[high--] = x[low];
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}
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x[low] = pivotkey;
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return low;
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}
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private static void swap(int a, int b)
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{
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int temp = a;
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a = b;
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b = temp;
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}
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#endregion
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}
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}
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不知道有有没有错误或者值得改进的地方,欢迎大家给意义和建议.