快速排序的思想:选择一个基准数(一般为左边第一个数),比它大的排在它的右边,比它小的排在右边,然后以这个数为基准线,对左右分而治之,重复上面的操作。
下面是从网友 那里盗的图,方便理解:
原图链接点我
代码:
using System;
using System.Collections;
using System.Collections.Generic;namespace cchoop {
class Program{
static void Main(string[] args){int[] arr = new int[] { 23, 45, 23, 22, 3, 4, 1, 0 };QuickSort(arr, 0, arr.Length - 1);foreach (var item in arr){Console.Write(item + " ");}}//3, 4, 1, 23, 45, 22//挖坑法,左右分治static void QuickSort(int[] arr, int low, int high){if (low < high){int index = QucikSortUnit(arr, low, high);QuickSort(arr, low, index - 1);QuickSort(arr, index + 1, high);}}static int QucikSortUnit(int[] arr, int low, int high){int temp = arr[low];while (low < high){while (low < high && arr[high] > temp){high--;}arr[low] = arr[high];while (low < high && arr[low] <= temp){low++;}arr[high] = arr[low];}arr[low] = temp;return low;}}
}