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快速排序: BAy)P1
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package org.rut.util.algorithm.support; -l<[CI
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import org.rut.util.algorithm.SortUtil; ej[Y
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/** W3xObt3w\
* @author treeroot Qv@)WJ="-0
* @since 2006-2-2 {'o\#4Wk
* @version 1.0 3JZ9 G79H
*/ zrV~7$HL
public class QuickSort implements SortUtil.Sort{ J6J;
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/* (non-Javadoc) CMfR&G,)
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) =BBqK=W.d
*/ }^PdW3O*m,
public void sort(int[] data) { 2*Mu"v,
quickSort(data,0,data.length-1); \7q>4[
} AE4>pzBe
private void quickSort(int[] data,int i,int j){ Y~
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int pivotIndex=(i+j)/2; mam(h{f$
//swap Ns-3\~QSi
SortUtil.swap(data,pivotIndex,j); F"a31`L>H
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int k=partition(data,i-1,j,data[j]); {&h=
SortUtil.swap(data,k,j); !%'c$U2
if((k-i)>1) quickSort(data,i,k-1); AAK}t6
if((j-k)>1) quickSort(data,k+1,j); _'P!>C!
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} $,jynRk7q
/** 74a>}+"
* @param data [4HOWM>\
* @param i /pz(s+4=
* @param j yV5AVMo
* @return 0GnbE2&
*/ BoXGoFn
private int partition(int[] data, int l, int r,int pivot) { $1myf Z
do{ ^qPS&G
while(data[++l] while((r!=0)&&data[--r]>pivot); bdr!|WZ
SortUtil.swap(data,l,r); rY(^6[ !
} \E,Fe:/g
while(l SortUtil.swap(data,l,r); #}zL?s^G
return l; {pEbi)CF,}
} K[i|OZWu
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} u/4|Akui
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改进后的快速排序: ~[
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package org.rut.util.algorithm.support; d=:&tOCg2
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import org.rut.util.algorithm.SortUtil; !J+< M~o}
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/** N2`u
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* @author treeroot D(Yq<%Q
* @since 2006-2-2 3,{tGNl|
* @version 1.0 /yL:_6c-
*/ \:91BQP
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public class ImprovedQuickSort implements SortUtil.Sort { ]73BJ
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private static int MAX_STACK_SIZE=4096; qGKQrb,K
private static int THRESHOLD=10; FrD,)Ad8Q
/* (non-Javadoc) .{LJ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) LxxFosi8
*/ #zc{N"!
public void sort(int[] data) { j?P8&Fm<
int[] stack=new int[MAX_STACK_SIZE]; D[R<H((
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int top=-1; "K-2y^Dl
int pivot; w7X], auRC
int pivotIndex,l,r; |.[4$C
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stack[++top]=0; a
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stack[++top]=data.length-1; kDr0D$iE
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while(top>0){ "6fTZ<
int j=stack[top--]; `)s>},8W!
int i=stack[top--]; `Hq)g1a7q
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pivotIndex=(i+j)/2; 3QzHQU
pivot=data[pivotIndex]; oyY0!w,Y
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SortUtil.swap(data,pivotIndex,j); Yet!qmZ
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//partition 5\$8"/H
l=i-1; p;m2RHYF
r=j; 7ezf.[{R
do{ l/w<R
while(data[++l] while((r!=0)&&(data[--r]>pivot)); kKRZ79"7s
SortUtil.swap(data,l,r); t&=]>blIs
} D$
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while(l SortUtil.swap(data,l,r); CGkCLd*s]
SortUtil.swap(data,l,j); 0`dMT>&I
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if((l-i)>THRESHOLD){ !{L`Zd;C>w
stack[++top]=i; +yd(t}H@
stack[++top]=l-1; F,-S&d
} E>3fk
if((j-l)>THRESHOLD){ `CQMvX{
stack[++top]=l+1; G6L
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stack[++top]=j; |KxFiH
} %8lF%uu!x
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} ?[G!6
//new InsertSort().sort(data); QcDWVM'v
insertSort(data); T5+iX`#M
} S<V__Sv
/** P ME
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* @param data .OC{,f+
*/ ^#VyI F3q
private void insertSort(int[] data) { gr")Jw7
int temp; }$ZcC_
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); r&t)%R@q
} =?/RaK/
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} Z:PsQ~M
} 9V=bV=4:
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} 6{r^3Hz
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