C#几种排序算法

本文介绍了C#的四种排序算法:冒泡排序、选择排序、插入排序和希尔排序 

冒泡排序

using System;

namespace BubbleSorter

{ public class BubbleSorter

{ public void Sort(int [] list)

{ int i,j,temp;

bool done=false;

j=1;

while((j<list.Length)&&(!done))

{ done=true;

for(i=0;i<list.Length-j;i++)

{

if(list[i]>list[i+1])

{

done=false;

temp=list[i];

list[i]=list[i+1];

list[i+1]=temp;

j++; }

} }

public class MainClass

{ public static void Main()

{

int[] iArrary=new int[]{1,5,13,6,10,55,99,2,87,12,34,75,33,47};

BubbleSorter sh=new BubbleSorter();

sh.Sort(iArrary);

for(int m=0;m<iArrary.Length;m++)

Console.Write("{0} ",iArrary[m]);

Console.WriteLine();

} }

}

 

选择排序

 

using System;

 

namespace SelectionSorter

{ public class SelectionSorter

{ private int min;

public void Sort(int [] list)

{ for(int i=0;i<list.Length-1;i++)

{ min=i;

for(int j=i+1;j<list.Length;j++)

{ if(list[j]<list[min])

min=j;

}

int t=list[min];

list[min]=list[i];

list[i]=t;

} }

}

public class MainClass

{ public static void Main()

{

int[] iArrary=new int[]{1,5,3,6,10,55,9,2,87,12,34,75,33,47};

SelectionSorter ss=new SelectionSorter();

ss.Sort(iArrary);

for(int m=0;m<iArrary.Length;m++)

Console.Write("{0} ",iArrary[m]);

Console.WriteLine();

} }

}

 

插入排序

 

using System;

namespace InsertionSorter

{ public class InsertionSorter

{ public void Sort(int [] list)

{ for(int i=1;i<list.Length;i++)

{ int t=list[i];

int j=i;

while((j>0)&&(list[j-1]>t))

{ list[j]=list[j-1];

--j;

}

list[j]=t; }

}

}

public class MainClass

{ public static void Main()

{

int[] iArrary=new int[]{1,13,3,6,10,55,98,2,87,12,34,75,33,47};

InsertionSorter ii=new InsertionSorter();

ii.Sort(iArrary);

for(int m=0;m<iArrary.Length;m++)

Console.Write("{0}",iArrary[m]);

Console.WriteLine();

} }

}

 

希尔排序

希尔排序是将组分段,进行插入排序

 

using System;

namespace ShellSorter

{

public class ShellSorter

{

public void Sort(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;

} }

} }

public class MainClass

{ public static void Main()

{

int[] iArrary=new int[]{1,5,13,6,10,55,99,2,87,12,34,75,33,47};

ShellSorter sh=new ShellSorter();

sh.Sort(iArrary);

for(int m=0;m<iArrary.Length;m++)

Console.Write("{0} ",iArrary[m]);

Console.WriteLine();

} }

}

 

快速排序

 

using System;
using System.Collections.Generic;
using System.Text;

namespace SoloDataStructure
{
    
class MyQuickSort
    
{
        
/// <summary>
        
/// 快速排序算法
        
/// </summary>
        
/// 快速排序为不稳定排序,时间复杂度O(nlog2n),为同数量级中最快的排序方法
        
/// <param name="arr">划分的数组</param>
        
/// <param name="low">数组低端上标</param>
        
/// <param name="high">数组高端下标</param>
        
/// <returns></returns>

        static int Partition(int[] arr, int low, int high)
        
{
            
//进行一趟快速排序,返回中心轴记录位置
           
// arr[0] = arr[low];
            int pivot = arr[low];//把中心轴置于arr[0]
            while (low < high)
            
{
                
while(low<high && arr[high]>=pivot)
                
--high;
            
//将比中心轴记录小的移到低端
            Swap(ref arr[high],ref arr[low]);
                
while(low<high && arr[low]<=pivot)
                
++low;
            Swap(
ref arr[high],ref arr[low]);
           
//将比中心轴记录大的移到高端
            }

            arr[low] 
= pivot; //中心轴移到正确位置
            return low;  //返回中心轴位置
        }

        
static void Swap(ref int i, ref int j)
        
{
            
int t;
            t 
= i;
            i 
= j;
            j 
= t;
        }
 
        
static void QuickSort(int[] arr,int low,int high)
        
{
            
if (low < high-1)//当 arr[low,high]为空或只一个记录无需排序
            {
                
int pivot = Partition(arr,low,high);
                QuickSort(arr,low,pivot
-1);
                QuickSort(arr,pivot
+1,high);

            }

        }

        
static void Main(string[] args)
        
{
            
int[] arr=new int[]{54,62,99,14,28,1,8,77,99,3,110};
            QuickSort(arr, 
0, arr.Length-1);
            Console.Write(
"Data After QuickSort:");
            
foreach (int i in arr)
            
{
                Console.Write(i
+",");
            }

            Console.ReadLine();
        }

    }

}

 

posted @ 2009-04-03 16:21  arangly  阅读(222)  评论(0编辑  收藏  举报