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快速排序: rOQhS]TP*
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package org.rut.util.algorithm.support; v9R#=m/=
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import org.rut.util.algorithm.SortUtil; jV
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/** KD?~ hpg
* @author treeroot `l,=iy$
* @since 2006-2-2 @Aa$k:_
* @version 1.0 !]1X0wo\
*/ UH/) 4Wg
public class QuickSort implements SortUtil.Sort{ #R$d6N[H
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/* (non-Javadoc) TJFxo?
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) _h>S7-X
*/ le*mr0a
public void sort(int[] data) { uU(G &:@
quickSort(data,0,data.length-1); 4q#6.E;yy
} 6Ug(J$Ouh
private void quickSort(int[] data,int i,int j){ s\QhCS
int pivotIndex=(i+j)/2; Li~(kw3
//swap lxoc.KDtR
SortUtil.swap(data,pivotIndex,j); fTiqY72h
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int k=partition(data,i-1,j,data[j]); "+3p??h%Rq
SortUtil.swap(data,k,j); }@MOkj
if((k-i)>1) quickSort(data,i,k-1); >!O3 jb k
if((j-k)>1) quickSort(data,k+1,j); Q!K@
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} & V:q}Q
/** Y: &?xR
* @param data [^xLK
* @param i xc dy/J&
* @param j #-
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* @return y~'F9E!i
*/ ppr95Y]^
private int partition(int[] data, int l, int r,int pivot) { 3qOq:ZkQ
do{ ?95^&4Oh0
while(data[++l] while((r!=0)&&data[--r]>pivot); qS<a5 `EA
SortUtil.swap(data,l,r); gX<"-,5jc
} N:'v^0
while(l SortUtil.swap(data,l,r); W5,e;4/hL
return l; T|^rFaA
} jqq96hP,
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} YW55iyM
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改进后的快速排序: 'Lu7cb^
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package org.rut.util.algorithm.support; PD$XLZ
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import org.rut.util.algorithm.SortUtil; Kp?):6
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/** +c4]}9f!
* @author treeroot K3*8JF7_F
* @since 2006-2-2 ?"f\"N
* @version 1.0 q<(yNqMKP
*/ 2RXU75VY
public class ImprovedQuickSort implements SortUtil.Sort { =H&{*Ja
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private static int MAX_STACK_SIZE=4096; :0G "EM4
private static int THRESHOLD=10; ^ FNvVbK|`
/* (non-Javadoc) 5&a4c"fU
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
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*/ mh`~1aEr
public void sort(int[] data) { \jL n5$OW
int[] stack=new int[MAX_STACK_SIZE]; 0S8v41i6
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