【导读】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();
}
}
}
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