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快速排序: p5In9s
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package org.rut.util.algorithm.support; Uahh|>s
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import org.rut.util.algorithm.SortUtil; NbWEP\dS'z
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/** Y]
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* @author treeroot CW`^fI9H
* @since 2006-2-2
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* @version 1.0 N\|B06X
*/ TjpyU:R,&|
public class QuickSort implements SortUtil.Sort{ IO7z}![V;
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/* (non-Javadoc) q~>!_q]FE
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) FC 8<D
*/ 8hV]t'/;
public void sort(int[] data) { uVYn,DB`
quickSort(data,0,data.length-1); :b9#e g
} <B%wq>4S
private void quickSort(int[] data,int i,int j){ b'(AVA
int pivotIndex=(i+j)/2; Ioe.[&o6B
//swap ]xf89[;0
SortUtil.swap(data,pivotIndex,j); \m`IgP*
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int k=partition(data,i-1,j,data[j]); '
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SortUtil.swap(data,k,j); |A4B4/!
if((k-i)>1) quickSort(data,i,k-1); t{,$?}
if((j-k)>1) quickSort(data,k+1,j); 2NFk#_9e~
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} 3 EAr=E]
/** JP!e'oWxi
* @param data ln<[CgV8
* @param i /5%'q~
* @param j 2k!uk6
* @return &[`24Db
*/ }[%F
private int partition(int[] data, int l, int r,int pivot) { %2RXrH2&H
do{ mAH7;u<
while(data[++l] while((r!=0)&&data[--r]>pivot); 9f['TG,"
SortUtil.swap(data,l,r); v~RxtTu
} u!xgLf'`
while(l SortUtil.swap(data,l,r); :qS~"@ ?<
return l; Qc33CA
} yO-2.2h
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} '+_-r'2
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改进后的快速排序: <F`9;WX
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package org.rut.util.algorithm.support; 06NiH-0O
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import org.rut.util.algorithm.SortUtil; F_u?.6e]
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/** Eoz/]b
* @author treeroot ym
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* @since 2006-2-2 Bl)D/
* @version 1.0 '>OEQU5-
*/ )1 @v<I
public class ImprovedQuickSort implements SortUtil.Sort { $_%
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private static int MAX_STACK_SIZE=4096; y2k's
private static int THRESHOLD=10; DvN_}h^nX
/* (non-Javadoc) &2@"zD
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) zt((TD2
*/ "=s dn
public void sort(int[] data) { d+Mogku2
int[] stack=new int[MAX_STACK_SIZE]; *{JD=ua
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int top=-1; d*!H&1L
int pivot; I9TNUZq('
int pivotIndex,l,r; =PU@'OG
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stack[++top]=0; ?,v@H$)3_
stack[++top]=data.length-1; wPyc?:|KD?
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while(top>0){ .&=\
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int j=stack[top--]; xR'd}>`
int i=stack[top--]; -Hi_g@i*XW
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pivotIndex=(i+j)/2; YC{7;=Pf
pivot=data[pivotIndex]; C#&b`
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SortUtil.swap(data,pivotIndex,j); u`L*
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//partition %[,^2s
l=i-1; O[ans_8
r=j; ?`*`A9@
do{ Pi&\GMzd
while(data[++l] while((r!=0)&&(data[--r]>pivot)); /|Gz<nSc
SortUtil.swap(data,l,r); &=8ZGjR< }
} $
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while(l SortUtil.swap(data,l,r); Z\-Gr
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SortUtil.swap(data,l,j); 7|m{hSc
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if((l-i)>THRESHOLD){ X7aj/:fXe
stack[++top]=i; hO3C _}
stack[++top]=l-1; Y5>'(A>
} LQ$dT#z2A
if((j-l)>THRESHOLD){ aBF<it>
stack[++top]=l+1; OOsd*nX/
stack[++top]=j; 3e[k 9`
} z ISy\uka
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} <
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//new InsertSort().sort(data); wS2N,X/Y
insertSort(data); u<@
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} V6<Ki
/** !OH'pC5
* @param data 5OFb9YX
*/ t5p#g<