C#幾種排序演算法

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作者:Sabine 【導讀】本文介紹了C#的四種排序演算法:冒泡排序、選擇排序、插入排序和希爾排序

 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();

} }

}

選擇排序

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();

} }

}

希爾排序

 希爾排序是將組分段,進行插入排序.

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>
/// 快速排序演算法
/// </summary>
/// 快速排序為不穩定排序,時間複雜度O(nlog2n),為同數量級中最快的排序方法
/// <param name="arr">劃分的數組</param>
/// <param name="low">數組低端上標</param>
/// <param name="high">數組高端下標</param>
/// <returns></returns>
static int Partition(int[] arr, int low, int high)
{
//進行一趟快速排序,返回中心軸記錄位置
// arr[0] = arr[low];
int pivot = arr[low];//把中心軸置於arr[0]
while (low < high)
{
while(low<high && arr[high]>=pivot)
--high;
//將比中心軸記錄小的移到低端
Swap(ref arr[high],ref arr[low]);
while(low<high && arr[low]<=pivot)
++low;
Swap(ref arr[high],ref arr[low]);
//將比中心軸記錄大的移到高端
}
arr[low] = pivot; //中心軸移到正確位置
return low; //返回中心軸位置
}
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)//當 arr[low,high]為空白或只一個記錄無需排序
{
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();
}
}
}

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