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快速排序: ]df9'\
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package org.rut.util.algorithm.support; g6@N PQ
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import org.rut.util.algorithm.SortUtil; 80 s~ae;
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/** 3I>S:|=K
* @author treeroot ^7~SS2t!
* @since 2006-2-2 6wpND|cT
* @version 1.0 <PfPh~
*/ CYFas:rPLT
public class QuickSort implements SortUtil.Sort{ < ;%q
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/* (non-Javadoc) pzt Zb
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) px
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*/ 5QL9w3L
public void sort(int[] data) { -aH?7HV}
quickSort(data,0,data.length-1); XY+aunLf
} G"U>fwFuK
private void quickSort(int[] data,int i,int j){ 2W"cTm
int pivotIndex=(i+j)/2; AG$-U2ap
//swap a_pCjG89
SortUtil.swap(data,pivotIndex,j); llZ"uTK\M
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int k=partition(data,i-1,j,data[j]); LKqog%,c
SortUtil.swap(data,k,j); 'a-5UTT
if((k-i)>1) quickSort(data,i,k-1); *nsnX/e(-
if((j-k)>1) quickSort(data,k+1,j); pZ_FVID
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}
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/** B yy-Cc
* @param data o.
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* @param i -EkDG]my
* @param j u6qi
* @return #H|j-RM2
*/ r;%zGF p
private int partition(int[] data, int l, int r,int pivot) { /[0 /8f6
do{ u'~b<@wHB
while(data[++l] while((r!=0)&&data[--r]>pivot); >uPde5"ZF-
SortUtil.swap(data,l,r); J%Z)#
} S!I <m&Cgc
while(l SortUtil.swap(data,l,r); e}Af"LI
return l; sen{f^U
} ILr6W@o5A
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} %\{?(baOA
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改进后的快速排序: (y+5d00
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package org.rut.util.algorithm.support; rCSG@D.
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import org.rut.util.algorithm.SortUtil; eVCkPv*
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/** 6B;_uIq5
* @author treeroot FvI0 J
* @since 2006-2-2 dVmAMQk.g
* @version 1.0 {u_k\m[Y
*/ 4|Gs(^nU
public class ImprovedQuickSort implements SortUtil.Sort { | 7'yk__m
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private static int MAX_STACK_SIZE=4096; 9}qfdbI
private static int THRESHOLD=10; c7nk~K[6
/* (non-Javadoc) +} ! F(c
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) }rMpp[
*/ G4exk5
public void sort(int[] data) { Znl>*e/|
int[] stack=new int[MAX_STACK_SIZE]; XFf+efh
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int top=-1; jVFRq T%
int pivot; HH~
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int pivotIndex,l,r; x{`<);CQ
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stack[++top]=0; u FYQ^
stack[++top]=data.length-1; 7E75s)KH
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while(top>0){ I`$I0
int j=stack[top--]; iQ}sp64
int i=stack[top--]; q(ET)xCeD
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pivotIndex=(i+j)/2; `E0.P V
pivot=data[pivotIndex]; z.9FDQLp
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SortUtil.swap(data,pivotIndex,j); |8U7C\S[
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