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package org.rut.util.algorithm.support; QbpFE)TYJ|
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import org.rut.util.algorithm.SortUtil; 55c|O
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/** M} v/tRI
* @author treeroot Dy8r 9
* @since 2006-2-2 cY. bO/&l
* @version 1.0 ><HE;cVg?
*/ l}sjD[2
public class QuickSort implements SortUtil.Sort{ K1!j fp
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/* (non-Javadoc) ur7q [n
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ut/=R !(K
*/ =D#bb<o
public void sort(int[] data) { :$BCRQ
quickSort(data,0,data.length-1); um>6z_"
} ^\&e:Nkh
private void quickSort(int[] data,int i,int j){ !9P';p}2
int pivotIndex=(i+j)/2; 2JcjZn
//swap *w0%d1
SortUtil.swap(data,pivotIndex,j); Jcm&RI"{
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int k=partition(data,i-1,j,data[j]); tc{sB\&-
SortUtil.swap(data,k,j); !6Mo]xh
if((k-i)>1) quickSort(data,i,k-1); O2dW6bt
if((j-k)>1) quickSort(data,k+1,j); )*x6 FfTUd
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} Jd^,]
/** GKc`xIQ
* @param data Qtv&ijFC
* @param i =CVB BuVy
* @param j FNY8tv*/x
* @return $F+ L Ds
*/ |f_[\&<*
private int partition(int[] data, int l, int r,int pivot) { A*P|e-&Q8
do{ o:P}Wg/NK
while(data[++l] while((r!=0)&&data[--r]>pivot); .rqhi
SortUtil.swap(data,l,r); @>>~CZ`l
} bsA-2*Q+
while(l SortUtil.swap(data,l,r); JKmIvZ)8
return l; r{I%
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} x!58cS*
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} ly_HWuFJ3
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改进后的快速排序: Bj-:#P@
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package org.rut.util.algorithm.support; s %\-E9
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import org.rut.util.algorithm.SortUtil; y0.8A-2:
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/** c*L\_Vx+
* @author treeroot 8~z~_TD6m@
* @since 2006-2-2 6){]1h"
* @version 1.0 e-#BDN(O
*/ ^pF&`2eD
public class ImprovedQuickSort implements SortUtil.Sort { QD*35Y!d
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private static int MAX_STACK_SIZE=4096; WE.{p>
private static int THRESHOLD=10; P0j8- I
/* (non-Javadoc) p(`6hWx
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) (w/T-*
*/ Xe:jAkDp
public void sort(int[] data) { B
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int[] stack=new int[MAX_STACK_SIZE]; .|b$NM
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int top=-1; EL 8<U
int pivot; l@+7:n4K0
int pivotIndex,l,r; JJ2_hVU
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stack[++top]=0; 9s$CA4?HP
stack[++top]=data.length-1; [b>Fn%y
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while(top>0){ ![_*(8v}S
int j=stack[top--]; :^WKT
int i=stack[top--]; BB*f4z$Y%
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pivotIndex=(i+j)/2; 7gvnl~C(
pivot=data[pivotIndex]; SVs_dG$
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SortUtil.swap(data,pivotIndex,j); !y:vLB#q
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//partition 2Mvrey)
l=i-1; F9E<K]7K
r=j; ,<tX%n`v=
do{ n;+LH9
while(data[++l] while((r!=0)&&(data[--r]>pivot)); b TM{l.Aq3
SortUtil.swap(data,l,r); %GA"GYL9'
} evAMJ=
while(l SortUtil.swap(data,l,r); -Rd/Gx
SortUtil.swap(data,l,j); #_J@-f7^
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if((l-i)>THRESHOLD){ UT=tT)4b
stack[++top]=i; F{Jw^\
stack[++top]=l-1; NOiN^::m
} ,p2s:&"
if((j-l)>THRESHOLD){ KgiJUO`PR
stack[++top]=l+1; Yu[ t\/
stack[++top]=j; f~y%%+{p
} >x+6{^}Q >
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} Avd
^
//new InsertSort().sort(data); )d1_Wm#B
insertSort(data); ,PuL{%PXu
} r1.nTO%
/** zHL@i0>^
* @param data ICs\
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*/ %g$V\zmU
private void insertSort(int[] data) { !^=*Jq>
int temp; ,dov<U[ia
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); V4P;
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} NI#:|}CYS
} , 5kKimTt
} 7;sj%U^'l
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}
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