软件设计核心----算法

如今的网站规划中算法不算多,但是想过面试这关,必须要掌握一些主流的算法,朋友上次面试就遇到了冒泡问题,在此顺带一提:

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);

forint 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)

{
forint i=0;i<list.Length-1;i++

{ min
=i;

forint 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);

forint 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();
} }
}

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