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快速排序: d)LifsD)
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package org.rut.util.algorithm.support; Pp?J5HW
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import org.rut.util.algorithm.SortUtil; B<W{kEY
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/** 3a =KgOvp
* @author treeroot ^z_~e@U
* @since 2006-2-2 FQ_4a}UOjX
* @version 1.0 ke/QFN-`
*/ h_J'dJS
public class QuickSort implements SortUtil.Sort{ <~]s+"oVc
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/* (non-Javadoc) SOd(& >
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) hD"Tjd` P
*/ 1 #_R`(C{
public void sort(int[] data) { /.vB /{2
quickSort(data,0,data.length-1); N[Fz6,ZG _
} 3ILEc:<0J
private void quickSort(int[] data,int i,int j){ ZT!DTb
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int pivotIndex=(i+j)/2; l =#uy
//swap A@GyKx%x$
SortUtil.swap(data,pivotIndex,j); `6'fX[j5
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int k=partition(data,i-1,j,data[j]); e4t'3So
SortUtil.swap(data,k,j); 60*=Bs%b
if((k-i)>1) quickSort(data,i,k-1); l%U{Unwu
if((j-k)>1) quickSort(data,k+1,j); ) "'J]6
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} 4Xlq
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/**
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* @param data Y~,N,>nITu
* @param i hl8[A-d(R
* @param j mI-$4st]
* @return \qKh9
*/ @hp@*$#& 9
private int partition(int[] data, int l, int r,int pivot) { E`BL3+k Q
do{ ka655O/)&
while(data[++l] while((r!=0)&&data[--r]>pivot); #49,7OBU
SortUtil.swap(data,l,r); JpN+'/
} 4~DoqT
while(l SortUtil.swap(data,l,r); N|wI=To
return l; %kUIIHV}
} }k$2r3
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} (wkeo{lx
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改进后的快速排序: ki39$A'8
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package org.rut.util.algorithm.support; 46sV\In>?
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import org.rut.util.algorithm.SortUtil; J'W6NitMr
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/** 4vF1
* @author treeroot UH2fP G
* @since 2006-2-2 j8P=8w{
* @version 1.0 R!5j1hMN`
*/ M"W-|t)~
public class ImprovedQuickSort implements SortUtil.Sort { _DS_AW}D
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private static int MAX_STACK_SIZE=4096; qq
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private static int THRESHOLD=10; 7vZznN8e
/* (non-Javadoc) r$d,ChzQn?
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) @-)jU!
*/ 4@-
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public void sort(int[] data) { 0@k)Cz[0;
int[] stack=new int[MAX_STACK_SIZE]; :@mb.'%*!
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int top=-1; R^4JM,v9x`
int pivot; }Ndknut,
int pivotIndex,l,r; #!qa#.Yi
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stack[++top]=0; 3w6}%=)$8
stack[++top]=data.length-1;
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while(top>0){ A&XI1. j6
int j=stack[top--]; `ZhDoLpH<
int i=stack[top--]; 7b7@"Zw*
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pivotIndex=(i+j)/2; 5o- WA1
pivot=data[pivotIndex]; 7,X5]U&A<x
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SortUtil.swap(data,pivotIndex,j); bLuAe
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//partition >UlAae44
l=i-1; $}+t|`*q8]
r=j; RDGefxv
do{ p,0J $L
while(data[++l] while((r!=0)&&(data[--r]>pivot)); Z7)la
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SortUtil.swap(data,l,r); xvU@,bzz
} A0JlQE&U
while(l SortUtil.swap(data,l,r); EbXWCD
SortUtil.swap(data,l,j); M<$a OW0
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if((l-i)>THRESHOLD){ -y]e`\+[
stack[++top]=i; u4hC/!
stack[++top]=l-1; ;d5d$Np@m&
} ufq9+}
if((j-l)>THRESHOLD){ Ls51U 7
stack[++top]=l+1; l7vU{Fd-h^
stack[++top]=j; X!6oviT|m
} *7cc4 wGQ
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} w\SfzJN
//new InsertSort().sort(data); x`9IQQ
insertSort(data); q.I
} @,kR<1
/** )/Z%
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* @param data PLoD^3uG)
*/ ]fiAV|'^
private void insertSort(int[] data) { U}hQVpP#
int temp; )a99@`L\P
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); T3H\KRe6
} ol#|
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} tg5G`P5PJ
} ~IQ3B$4H&
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} NW?.Ge.!P
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