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快速排序: \:LW(&[!
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package org.rut.util.algorithm.support; s6`?LZ0(z
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import org.rut.util.algorithm.SortUtil; X%x*f3[
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/** (KZ{^X?a
* @author treeroot a/xn'"eli
* @since 2006-2-2 Tpa5N'O
* @version 1.0 @-`*m+$U6
*/ 3F^Q51:t
public class QuickSort implements SortUtil.Sort{ SNk=b6`9
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/* (non-Javadoc) ('+d.F[109
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) F#5~M<`.o
*/ yyTnL 2Y9
public void sort(int[] data) { /PXzwP_(A
quickSort(data,0,data.length-1); G7/ +ogV
} 1<aP92/N&
private void quickSort(int[] data,int i,int j){ g2Z`zQA7
int pivotIndex=(i+j)/2; }3WxZv]I}
//swap aV0"~5
SortUtil.swap(data,pivotIndex,j); ]\HvK CN}
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int k=partition(data,i-1,j,data[j]); s_p!43\J
SortUtil.swap(data,k,j); qwAT>4
if((k-i)>1) quickSort(data,i,k-1); 4Ftu
if((j-k)>1) quickSort(data,k+1,j); l,aay-E
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} SOaoo^,O
/** <qt|d&
* @param data +R75v )
* @param i gf\oC> N
* @param j +R:(_:7
* @return }"%N4(Kd
*/ * kh tJ]=
private int partition(int[] data, int l, int r,int pivot) { 6j|{`Zd)G
do{ P@~yx#G
while(data[++l] while((r!=0)&&data[--r]>pivot); 7tCw*t$
SortUtil.swap(data,l,r); goWuw}?
} 2y1Sne=<Kb
while(l SortUtil.swap(data,l,r); HTTCTR
return l; V>rU.Mp
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} AFt s(
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} _7y[B&g[r
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改进后的快速排序: \a3+rNdj
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package org.rut.util.algorithm.support; <9b&<K:
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import org.rut.util.algorithm.SortUtil; V>3X\)qu
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/** )0k53-h&
* @author treeroot }c:M^Ff
* @since 2006-2-2 E=O\0!F|b
* @version 1.0 [dV L&k<P
*/ bpa?C
public class ImprovedQuickSort implements SortUtil.Sort { 3=V&K-
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private static int MAX_STACK_SIZE=4096; ;q>ah!"k
private static int THRESHOLD=10; f*
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/* (non-Javadoc) fI|$K)K
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) + LJ73
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*/ bW+:C5'
public void sort(int[] data) { L-&\\{X
int[] stack=new int[MAX_STACK_SIZE]; _,*r_D61S
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int top=-1; )=(kBWM
int pivot; M869MDo
int pivotIndex,l,r; *qpSXmOz
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stack[++top]=0; Z4bNV?OH
stack[++top]=data.length-1; LFV%&y|L
+
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while(top>0){ b\,+f n
int j=stack[top--]; tX~w{|k
int i=stack[top--]; wb ;xRP"w
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pivotIndex=(i+j)/2; ]eV8b*d6
pivot=data[pivotIndex]; K:WDl;8(d
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SortUtil.swap(data,pivotIndex,j); 1{.9uw"2S
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//partition :rP=t ,
l=i-1; asqV~n
r=j; e+=K d+:k
do{ iN.n8MN=I
while(data[++l] while((r!=0)&&(data[--r]>pivot)); $<OD31T
SortUtil.swap(data,l,r); y>ktcuML
} !H\F2Vxs
while(l SortUtil.swap(data,l,r); ~F#j#n(=`q
SortUtil.swap(data,l,j); ^=*;X;7
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if((l-i)>THRESHOLD){ &xExyz~`
stack[++top]=i; A":T1s
stack[++top]=l-1; @PIp*[7oC
} 8xMX
if((j-l)>THRESHOLD){ vw@S>GlGg
stack[++top]=l+1; Ni7nq8B<
stack[++top]=j; -I%5$`z
} rSNi@;
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} (w zQ2Dk
//new InsertSort().sort(data); ?r!o~|9|
insertSort(data); [<TrS/,)>
} "EJ~QCW*Yh
/** -ze J#B)C
* @param data R^e'}+Z
*/ K.yb
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private void insertSort(int[] data) { &,)&%Sg[
int temp; IvNT6]6 P
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); iJ|uvPCE
} 51.%;aY~z
} $NO&YLS@
} q0\6F^;M
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} N)Z?Z+}h
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