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快速排序: U24V55ZnI
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package org.rut.util.algorithm.support; dnk1Mu<
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import org.rut.util.algorithm.SortUtil; dr}O+7_7%-
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/** r*xq(\v
* @author treeroot S|tA[klh
* @since 2006-2-2 l8eT{!4
* @version 1.0 zC[i <'h!T
*/
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public class QuickSort implements SortUtil.Sort{ N <ja6Ac
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/* (non-Javadoc) Id; mn}+~
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) RiwEuY
*/ [Q7`RB
public void sort(int[] data) { ;I[.
quickSort(data,0,data.length-1); zjzqKdy}F
} P^i6MZ?
private void quickSort(int[] data,int i,int j){ V>DXV-%&C
int pivotIndex=(i+j)/2; 9
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//swap !N@Yh"c
SortUtil.swap(data,pivotIndex,j); Z8N@e<!*~8
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int k=partition(data,i-1,j,data[j]); ^Jc$BMaVg
SortUtil.swap(data,k,j); &?&'"c{;m
if((k-i)>1) quickSort(data,i,k-1); HrM)jC<~
if((j-k)>1) quickSort(data,k+1,j); AN50P!FZW
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} iLc)"L-i
/** YN$ndqOP
* @param data N. ItyV
* @param i EG8%~k+R
* @param j "0p +SZ~D
* @return HE8'N=0
*/ 1v+JCOy
private int partition(int[] data, int l, int r,int pivot) { qQ3]E][/
do{ g9RzzE!
while(data[++l] while((r!=0)&&data[--r]>pivot); y=y/d>=w
SortUtil.swap(data,l,r); ,K"r:)\
} {b\Y?t^>f
while(l SortUtil.swap(data,l,r); =P@M&Yy'
return l; ";%e~
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} :T8u?@.
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} WMt&8W5
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改进后的快速排序: P*?d6v,r
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package org.rut.util.algorithm.support; qJe&jLZa
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import org.rut.util.algorithm.SortUtil; /S-/SF:>g
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/** 3Y.d&Nz
* @author treeroot 3 LZL!^ 5N
* @since 2006-2-2 !07FsPI#{
* @version 1.0 <lsi.x\y<
*/ rF
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public class ImprovedQuickSort implements SortUtil.Sort { 6z%&A]6k:
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private static int MAX_STACK_SIZE=4096; A,-[/Z K/
private static int THRESHOLD=10; 98"z0nI%
/* (non-Javadoc) sYW1T @
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 4okHAv8;
*/ n]kQtjJ
public void sort(int[] data) { fS8XuT
int[] stack=new int[MAX_STACK_SIZE]; ?(|TP^
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int top=-1; ]DL>
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int pivot; ,Jw\3T1V
int pivotIndex,l,r; .~V".tZV[
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stack[++top]=0; 3\+[38 _
stack[++top]=data.length-1; VdjU2d
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while(top>0){ Q9Xmb2LN
int j=stack[top--]; ]e#,\})Br
int i=stack[top--]; 6w:g77SH)%
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pivotIndex=(i+j)/2; ZIGbwL
pivot=data[pivotIndex]; ^HOwN<}`#
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SortUtil.swap(data,pivotIndex,j); VLwJ6?.f'
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//partition *;ZW=%M
l=i-1; O #uaGziFf
r=j; iYmzk?U
do{ V}Y~z)i0
while(data[++l] while((r!=0)&&(data[--r]>pivot)); qx#ghcU
SortUtil.swap(data,l,r); wKeSPs{x
} nFf\tf%8
while(l SortUtil.swap(data,l,r); hz>yv@1
SortUtil.swap(data,l,j); 4u{E D(
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if((l-i)>THRESHOLD){ z!t3xFN&/
stack[++top]=i; Kr+Bty
stack[++top]=l-1; A{n*NxKCX!
} x"h)"Y[c5
if((j-l)>THRESHOLD){ :a^,Ei-&
stack[++top]=l+1; I_Mqh4];
stack[++top]=j; 0
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} D=pI'5&
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} ?6.KS
//new InsertSort().sort(data); u0 'pR#
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insertSort(data); ~n]2)>6
} KWZNu&)
/** >x _:=%Wr+
* @param data +lf@O&w
*/ wTgx(LtH
private void insertSort(int[] data) { tr67ofld|
int temp; /i]=ndAk
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); MlcoOi!
} %(wsGNd
} dA M ilTo
} -$!Pf$l@
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