• 几种常见的数组排序方法


    废话不多说,代码如下,基本的解释也有

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    
    namespace SuanFa
    {
        class Program
        {
            private static int min;
    
            static void Main(string[] args)
            {
                int[] ints = { 2, 8, 22, 88, 9, 6, 2, 7 };
                Sort(ints);
                Print(ints);
                
                int[] ints2 = { 2, 8, 22, 88, 9, 6, 2, 7 };
                SortMaoPao(ints2);
                Print(ints2);
    
                int[] ints3 = { 2, 8, 22, 88, 9, 6, 2, 7 };
                SortKuaiSu(ints3, 1, 7);
                Print(ints3);
    
                int[] ints4 = { 2, 8, 22, 88, 9, 6, 2, 7 };
                SortCharu(ints4);
                Print(ints4);
    
                int[] ints5 = { 2, 8, 22, 88, 9, 6, 2, 7 };
                SortXiEr(ints5);
                Print(ints5);
                int[] ints6 = { 2, 8, 22, 88, 9, 6, 2, 7 };
                Print(SortBingGui(ints6));
    
                Console.Read();
            }
            public static void Print(int[] ints)
            {
                foreach (int i in ints)
                {
                    Console.Write(i + ",");
                }
                Console.WriteLine();
            }
            /// <summary>
            /// 选择排序
            /// </summary>
            /// <param name="arr"></param>
            public static void Sort(int[] arr)
            {
    
                for (int i = 0; i < arr.Length - 1; ++i)
                {
                    min = i;
                    for (int j = i + 1; j < arr.Length; ++j)
                    {
                        if (arr[j] < arr[min])
                            min = j;
                    }
                    int t = arr[min];
                    arr[min] = arr[i];
                    arr[i] = t;
    
                }
    
            }
    
            /// <summary>
            /// 冒泡排序
            /// </summary>
            /// <param name="arr"></param>
            public static void SortMaoPao(int[] arr)
            {
                int i, j, temp;
                bool done = false;
                j = 1;
                while ((j < arr.Length) && (!done))//判断长度
                {
                    done = true;
                    for (i = 0; i < arr.Length - j; i++)
                    {
                        if (arr[i] > arr[i + 1])
                        {
                            done = false;
                            temp = arr[i];
                            arr[i] = arr[i + 1];//交换数据  
                            arr[i + 1] = temp;
                        }
    
                    }
                    j++;
                }
            }
    
    
            private static void swap(ref int l, ref int r)
            {
                int temp;
                temp = l;
                l = r;
                r = temp;
            }
            /// <summary>
            /// 快速排序
            /// </summary>
            /// <param name="list"></param>
            /// <param name="low">起始位置</param>
            /// <param name="high">结束位置</param>
            public static void SortKuaiSu(int[] list, int low, int high)
            {
                int pivot;//存储分支点
                int l, r;
                int mid;
                if (high <= low)
                    return;
                else if (high == low + 1)
                {
                    if (list[low] > list[high])
                        swap(ref list[low], ref list[high]);
                    return;
    
                }
                mid = (low + high) >> 1;
                pivot = list[mid];
                swap(ref list[low], ref list[mid]);
                l = low + 1;
                r = high;
                do
                {
                    while (l <= r && list[l] < pivot)
                        l++;
                    while (list[r] >= pivot)
                        r--;
                    if (l < r)
                        swap(ref list[l], ref list[r]);
                } while (l < r);
                list[low] = list[r];
                list[r] = pivot;
                if (low + 1 < r)
                    SortKuaiSu(list, low, r - 1);
                if (r + 1 < high)
                    SortKuaiSu(list, r + 1, high);
            }
            /// <summary>
            /// 插入插叙
            /// </summary>
            /// <param name="arr"></param>
            public static void SortCharu(int[] arr)
            {
                for (int i = 1; i < arr.Length; i++)
                {
                    int t = arr[i];
                    int j = i;
                    while ((j > 0) && (arr[j - 1] > t))
                    {
                        arr[j] = arr[j - 1];//交换顺序
                        --j;
                    }
                    arr[j] = t;
                }
            }
    
            /// <summary>
            /// 希尔排序
            /// </summary>
            /// <param name="arr"></param>
            public static void SortXiEr(int[] list)
            {
                int inc;
                for (inc = 1; inc <= list.Length / 9; inc = 3 * inc + 1) ;
                for (; inc > 0; inc /= 3)
                {
                    for (int i = inc + 1; i <= list.Length; i += inc)
                    {
                        int t = list[i - 1];
                        int j = i;
                        while ((j > inc) && (list[j - inc - 1] > t))
                        {
                            list[j - 1] = list[j - inc - 1];
                            j -= inc;
                        }
                        list[j - 1] = t;
                    }
                }
    
            }
            /// <summary>
            /// 归并排序之归:归并排序入口 
            /// Updated by Lihua at 05/06/2009
            /// </summary>
            /// <param name="data">无序数组</param>
            /// <returns>有序数组</returns>
            /// <author>lihua</author>
            /// <copyright>www.zivsoft.com</copyright>
            static  int[] SortBingGui(int[] data)
            {
                //若data为null,或只剩下1 or 0个元素,返回,不排序
                if (null == data || data.Length <= 1)
                {
                    return data;
                }
    
                //取数组中间下标
                //int middle = data.Length / 2; //方法一:除2取整数
                int middle = data.Length >> 1;  //方法二:位移 (感谢读者hyper给出的这个效率稍高的方法)
    
                //初始化临时数组let,right,并定义result作为最终有序数组,若数组元素奇数个,将把多余的那元素空间预留在right临时数组
                int[] left = new int[middle], right = new int[data.Length - middle], result = new int[data.Length];
    
                //下面这句对性能有些影响,所以在上面有了改进,直接用data.Length-middle初始化right数组
                //if (data.Length % 2 != 0) right = new int[middle + 1]; 
    
                //int i = 0, j = 0;
                //foreach (int x in data)//开始排序
                //{
                //    if (i < middle)//填充左数组
                //    {
                //        left[i] = x;
                //        i++;
                //    }
                //    else//填充右数组
                //    {
                //        right[j] = x;
                //        j++;
                //    }
                //}
    
                //上面的foreach被改成了for循环
                //for (int i = 0; i < data.Length; i++)
                //{
                //    if (i < middle)//用middle,不用left.Length
                //    {
                //        left[i] = data[i];
                //    }
                //    else
                //    {
                //        right[i - middle] = data[i]; //此处i-middle,让我省掉定义一个j,性能有所提高
                //    }
                //}
    
                //经调查,用Array.Copy的确比上面的for循环优化很多
                Array.Copy(data, 0, left, 0, middle);//拷贝左数组
                Array.Copy(data, left.Length, right, 0, right.Length); //拷贝右数组
    
                left = SortBingGui(left);//递归左数组
                right = SortBingGui(right);//递归右数组
                result = Merge(left, right);//开始排序
                //this.Write(result);//输出排序,测试用(lihua debug)
                return result;
            }
            /// <summary>
            /// 归并排序之并:排序在这一步
            /// </summary>
            /// <param name="a">左数组</param>
            /// <param name="b">右数组</param>
            /// <returns>合并左右数组排序后返回</returns>
           static  int[] Merge(int[] a, int[] b)
            {
                //定义结果数组,用来存储最终结果
                int[] result = new int[a.Length + b.Length];
                int i = 0, j = 0, k = 0;
                while (i < a.Length && j < b.Length)
                {
                    if (a[i] < b[j])//左数组中元素小于右数组中元素
                    {
                        result[k++] = a[i++];//将小的那个放到结果数组
                    }
                    else//左数组中元素大于右数组中元素
                    {
                        result[k++] = b[j++];//将小的那个放到结果数组
                    }
                }
                while (i < a.Length)//这里其实是还有左元素,但没有右元素
                {
                    result[k++] = a[i++];
                }
                while (j < b.Length)//右右元素,无左元素
                {
                    result[k++] = b[j++];
                }
                return result;//返回结果数组
            }
    
        }
    }
    
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  • 原文地址:https://www.cnblogs.com/liuruitao/p/4313599.html
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