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快速排序: C"<@EMU9
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package org.rut.util.algorithm.support; ?f&I"\y
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import org.rut.util.algorithm.SortUtil; EM}z-@A>
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/** H=C;g)R
* @author treeroot P+h&tXZn8
* @since 2006-2-2 67?5Cv
* @version 1.0 63=m11Z4
*/ 'o L8Z
public class QuickSort implements SortUtil.Sort{ AAcbY;
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/* (non-Javadoc) P_U-R%f
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) d9"4m>ymS
*/ 4^&vRD,
public void sort(int[] data) { ev $eM
quickSort(data,0,data.length-1); 5>Q)8`@E
} ZD(gYNi
private void quickSort(int[] data,int i,int j){
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int pivotIndex=(i+j)/2; 8vK&d>
//swap E12k1gC`
SortUtil.swap(data,pivotIndex,j); KJ_R@,v\
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int k=partition(data,i-1,j,data[j]); tw66XxE
SortUtil.swap(data,k,j); >.|gmo>b
if((k-i)>1) quickSort(data,i,k-1); @Rm/g#!h"
if((j-k)>1) quickSort(data,k+1,j); LNkyV*TI
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} /&yT2p
/** a2TC,
* @param data }|,y`ui\
* @param i "T|\
* @param j ZtVa*xl
* @return O [/~V=
*/ b3+PC$z2h
private int partition(int[] data, int l, int r,int pivot) { S6]':
do{ 1oPT8)[U
while(data[++l] while((r!=0)&&data[--r]>pivot); 4KCxhJq
SortUtil.swap(data,l,r); L@XeAEIq
} \~PFD%]:3
while(l SortUtil.swap(data,l,r); F*f)Dv$p
return l; ]_s]Q_+E
} LxT ]-
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} n>WS@b/o
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改进后的快速排序: h.*|4;
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package org.rut.util.algorithm.support; .FU EF)
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import org.rut.util.algorithm.SortUtil; W=!f
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/** 4%TC2Laii
* @author treeroot N!AFsWV
* @since 2006-2-2 T (qu~}
* @version 1.0 =>G A_
*/ PO&`rr
public class ImprovedQuickSort implements SortUtil.Sort { f@0`,
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private static int MAX_STACK_SIZE=4096; v,;?+Ck
private static int THRESHOLD=10; =R05H2hs
/* (non-Javadoc) jKzjTn9{E
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) s>5 Z
*/ >EY0-B
public void sort(int[] data) { o&]qjFo\m
int[] stack=new int[MAX_STACK_SIZE]; o#i{/#oF
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int top=-1; yFSL7`p+
int pivot; Ot?rsr
int pivotIndex,l,r; fOVRtSls
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stack[++top]=0; >L%%B-
stack[++top]=data.length-1; DxlX-
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while(top>0){ :|a[6Uwl\V
int j=stack[top--]; Ev%\YI!MaY
int i=stack[top--]; <