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快速排序: 2s6Hr;^w.1
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package org.rut.util.algorithm.support; Ahq^dx#o
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import org.rut.util.algorithm.SortUtil; MOmp{@
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/** ^HL#)fK2I
* @author treeroot XfsCu>
* @since 2006-2-2 X>|.BvY|
* @version 1.0 ]3QQ"HLcp
*/ _L!"3
public class QuickSort implements SortUtil.Sort{ D\V}Eo';6
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/* (non-Javadoc) .+B)@?
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) g%=\Wiit]
*/ j4}aK2[<
public void sort(int[] data) { t7A.b~#
quickSort(data,0,data.length-1); I"JT3[*s
} ESASsRzk
private void quickSort(int[] data,int i,int j){ $@&bK2@.(
int pivotIndex=(i+j)/2; 1=(i{D~
//swap xHr
SortUtil.swap(data,pivotIndex,j);
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int k=partition(data,i-1,j,data[j]); "3j0)
SortUtil.swap(data,k,j); G:e} >'
if((k-i)>1) quickSort(data,i,k-1); 3 ^su%z_%
if((j-k)>1) quickSort(data,k+1,j); f(n{7
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} JrL/LGY
/** LbYI{|_Js
* @param data "|Q&
* @param i ;LrKXp
* @param j kkOYC?zE?
* @return Mc6Cte]3|
*/ w pCS]2
private int partition(int[] data, int l, int r,int pivot) { (x$k\H
do{ ?I@3`?'
while(data[++l] while((r!=0)&&data[--r]>pivot); aQ~x$T|
SortUtil.swap(data,l,r); Mm[%v
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} MA-$aN_(
while(l SortUtil.swap(data,l,r); ga~vQ7I_
return l; Zz3#Kt5t3
} sy@k3wQ
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}
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改进后的快速排序: "+Qh,fTt
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package org.rut.util.algorithm.support; =0]Mc$Ih
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import org.rut.util.algorithm.SortUtil; bL[PNUG
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/** 2\5@_U^)h
* @author treeroot mmKrmM*1
* @since 2006-2-2 I]
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* @version 1.0 sw@2
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*/ .N+xpxdG,
public class ImprovedQuickSort implements SortUtil.Sort { c,~44Z
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private static int MAX_STACK_SIZE=4096; ]Ns&`Yn{
private static int THRESHOLD=10; <NAR'{f
/* (non-Javadoc) BA>0
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ,/ig8~u'c
*/ =}"hC`3e
public void sort(int[] data) { 8
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int[] stack=new int[MAX_STACK_SIZE]; jN<]yhqf
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int top=-1; bn(Scl#@K
int pivot; ?rK%;GTo
int pivotIndex,l,r; =J'?>-B
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stack[++top]=0; Q:MsD.
stack[++top]=data.length-1; q7PRJX
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while(top>0){ jI V? p
int j=stack[top--]; .>nd@oU
int i=stack[top--]; $tKATL*
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pivotIndex=(i+j)/2; y^Jv?`jw
pivot=data[pivotIndex]; jbGH3 L
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SortUtil.swap(data,pivotIndex,j); dB,#`tc=,
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//partition 4>Y\2O?**
l=i-1; (hV"z; rI
r=j; %i
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do{ *Fc&DQT(
while(data[++l] while((r!=0)&&(data[--r]>pivot)); ;'
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SortUtil.swap(data,l,r); '_<`dzz
} 3"hR:'ts
while(l SortUtil.swap(data,l,r); y,>m#6hx#
SortUtil.swap(data,l,j); >V$#Um?AXj
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if((l-i)>THRESHOLD){ (qP$I:Q4]v
stack[++top]=i; R
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stack[++top]=l-1; 5q#|sVT7R
} yk)j;i4@
if((j-l)>THRESHOLD){ 4Qo1f5>N
stack[++top]=l+1; B<&_lG0s