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快速排序: d8r+UP@#
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package org.rut.util.algorithm.support; 0yZw`|Zh[
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import org.rut.util.algorithm.SortUtil; 9q5[W=|
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/** kN) pi "
* @author treeroot *lTu-
* @since 2006-2-2 JC+VG;kcs
* @version 1.0 w'eenIX^^
*/ ;s!H
public class QuickSort implements SortUtil.Sort{ 07MLK8jS
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/* (non-Javadoc) hg&AQk
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Fca?'^X
*/ wvYxL
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public void sort(int[] data) { aOuon0
quickSort(data,0,data.length-1); W>Kwl*Cis"
} ?@,:\ ,G
private void quickSort(int[] data,int i,int j){ l00D|W_9
int pivotIndex=(i+j)/2; G?g7G,|d
//swap Z:OO|x
SortUtil.swap(data,pivotIndex,j); KWY G\#S0]
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int k=partition(data,i-1,j,data[j]); b$e JH
SortUtil.swap(data,k,j); IpP0|:}
if((k-i)>1) quickSort(data,i,k-1); d^Wh-U
if((j-k)>1) quickSort(data,k+1,j); bpILiC
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} %2+]3h>g
/** 9c 6V&b
* @param data Qp54(`
* @param i pJ(l=a
* @param j `fRy"44nR
* @return Ue7W&N^E
*/ g\Zk*5(
private int partition(int[] data, int l, int r,int pivot) { oF^B J8%Lm
do{ Ij8tBT?jlL
while(data[++l] while((r!=0)&&data[--r]>pivot); 2n=;"33%a
SortUtil.swap(data,l,r); %qHT!aP
} = V , _
while(l SortUtil.swap(data,l,r); [4t KJ+v
return l; Y>%NuL|s
} +!Ltn
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} w\ :b(I
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改进后的快速排序: t<7WM'2<y
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package org.rut.util.algorithm.support; [ bW=>M
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import org.rut.util.algorithm.SortUtil; L_r &'B
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/** N'1~ wxd
* @author treeroot :&%;s*-9
* @since 2006-2-2 6.jZy~
* @version 1.0 Hn~1x'$
*/ Z^l!y5s/H
public class ImprovedQuickSort implements SortUtil.Sort { ChGM7uu2
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private static int MAX_STACK_SIZE=4096; NZuFxJ-`
private static int THRESHOLD=10; THp `!l
/* (non-Javadoc) Y Pc<
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) <7^~r(DP
*/ Zy%Z]dF
public void sort(int[] data) { yDC97#%3u
int[] stack=new int[MAX_STACK_SIZE]; ,Aii>D]
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int top=-1; GP$Y4*y/
int pivot; B,>Fh X>h
int pivotIndex,l,r; U VKN#"_{
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stack[++top]=0; Q(6(Scp{
stack[++top]=data.length-1; D2p6&HNT
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while(top>0){ hl:eF:'hm
int j=stack[top--]; 4QNR_w
int i=stack[top--]; ->8q, W2A
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pivotIndex=(i+j)/2; r\d:fot
pivot=data[pivotIndex]; clw91yrQn
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SortUtil.swap(data,pivotIndex,j); 02[II_< 1
R!,)?j;
//partition gxM8IQ
l=i-1; Jf$wBPg
r=j; DcA'{21
do{ !&lPdEc@T
while(data[++l] while((r!=0)&&(data[--r]>pivot)); B6\VxSX4{
SortUtil.swap(data,l,r); (Y)h+}n5N
} ?m1$*j
while(l SortUtil.swap(data,l,r); oDUMoX%4s
SortUtil.swap(data,l,j); \T9UbkR
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if((l-i)>THRESHOLD){ !@{[I:5
stack[++top]=i; SZ{cno1`
stack[++top]=l-1; H>f{3S-%
} 6W;kIoB
if((j-l)>THRESHOLD){ 9 Zm<1Fw
stack[++top]=l+1; )uvFta<(
stack[++top]=j; rj~ian
} "S`wwl
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} _KVB~loT
//new InsertSort().sort(data); :, [!8QP
insertSort(data); #ya|{K
} ->I{
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/** I%919
* @param data 3 ?F@jEQk
*/ \STvBI?
private void insertSort(int[] data) { Qu FCc1Q
int temp; X.l"f'`l
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); f+Me dc~
} W;dzLgc
} 2gAdZE&Y
} FM"BTA:C
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} lMez!qx,=
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