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快速排序: ]Ox.6BKjDP
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package org.rut.util.algorithm.support; zOw]P6Gk
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import org.rut.util.algorithm.SortUtil; xWm'E2
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/** L)5nb-qp
* @author treeroot *?+!(E
* @since 2006-2-2 \^cn}db)
* @version 1.0 WXL.D_=+
*/ 2<|5zF
public class QuickSort implements SortUtil.Sort{ m}(DJ?qP
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/* (non-Javadoc) Y# #J
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ~Zm(p*\T
*/ 4`F*] Ft
public void sort(int[] data) { <k!G%R<9
quickSort(data,0,data.length-1); _p.{|7
} 4E)[<%
private void quickSort(int[] data,int i,int j){ $;1~JOZh
int pivotIndex=(i+j)/2; e1-=|!U7#
//swap y=Hl ~ev`9
SortUtil.swap(data,pivotIndex,j); ($TxVFNT
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int k=partition(data,i-1,j,data[j]); 2H#vA
SortUtil.swap(data,k,j); /MC\!,K
if((k-i)>1) quickSort(data,i,k-1); L"a#Uu8
if((j-k)>1) quickSort(data,k+1,j); 4o8!p\a
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} Yy}aQF#M
/** k*Kq:$9"
* @param data +}Pa/8ybJ
* @param i C&T3vM
* @param j ?8 F7BS4oQ
* @return = DgD&_
*/ ;ORy&H aKl
private int partition(int[] data, int l, int r,int pivot) { ;V
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do{ pK`rm"6G
while(data[++l] while((r!=0)&&data[--r]>pivot); itU01
SortUtil.swap(data,l,r); l
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} QWkw$mcf
while(l SortUtil.swap(data,l,r); k<qQ+\X
return l; MqqS3
} a#1X)ot
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改进后的快速排序: vIJdl2(^E
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package org.rut.util.algorithm.support; N%a[Y
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import org.rut.util.algorithm.SortUtil; QEPmuG
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/** 3,?y !
* @author treeroot yBoZ@9Do
* @since 2006-2-2 "J9+~)e^!
* @version 1.0 SXL6)pX
*/ pV!(#45 ~W
public class ImprovedQuickSort implements SortUtil.Sort { 8yo9$~u;
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private static int MAX_STACK_SIZE=4096; m3D'7*U
private static int THRESHOLD=10;
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/* (non-Javadoc) Km?i{TW
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ICi- iX
*/ Rl~Tw9
public void sort(int[] data) { xOT3>$
int[] stack=new int[MAX_STACK_SIZE]; ,y.0Cb0
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int top=-1; G\ofg
int pivot; sDiYm}W
int pivotIndex,l,r; .UcS4JU
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stack[++top]=0; ^\!p;R
stack[++top]=data.length-1; ObCwWj^qO
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while(top>0){ mf3 G$=[
int j=stack[top--]; LP~$7a
int i=stack[top--]; Rq7ks To
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pivotIndex=(i+j)/2; QUNsS9
pivot=data[pivotIndex]; DXUI/C f
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SortUtil.swap(data,pivotIndex,j); O ?4V($
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//partition ;i]cmy
l=i-1; fq(e~Aqw$
r=j; rLnu\X=h$
do{ /~yqZD<O
while(data[++l] while((r!=0)&&(data[--r]>pivot)); &jJgAZ!
SortUtil.swap(data,l,r); q\,H9/.0k
} Ov9.qNT
while(l SortUtil.swap(data,l,r); NF.SGga
SortUtil.swap(data,l,j); "*0
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if((l-i)>THRESHOLD){ f,1rmX1
stack[++top]=i; 5Z:HCp-aG
stack[++top]=l-1; ZoUfQ!2*
} l|K8+5L
if((j-l)>THRESHOLD){ @sDd:>t
stack[++top]=l+1; jK{MU) D+
stack[++top]=j; !xvPG
} W1OGN4`C
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} '>6-ie^0
//new InsertSort().sort(data); L.R
insertSort(data); 6Z"%vrH
} Wp'\NFe8
/** D >mLSh
* @param data KpE#Ye&
*/ YPM>FDxDB
private void insertSort(int[] data) { TKE)NIa
int temp; i ]_fh C
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); i~2>kxf;K1
} t@ Jo ?0s
} ``SjALf
} 7Ct m({I-
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} )#Id2b~
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