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快速排序: 8';m)Jc
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package org.rut.util.algorithm.support; ,"~WkLI~\t
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import org.rut.util.algorithm.SortUtil; /_]ltX D
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/** [/
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* @author treeroot I[}75:^Rt
* @since 2006-2-2 ?q\FLb%"7
* @version 1.0 %dEB /[
*/ 7=}6H3|&
public class QuickSort implements SortUtil.Sort{ 4HM;K_G%{
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/* (non-Javadoc) eymi2-a<
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ? m&IF<b
*/ :.Y|I[\E%
public void sort(int[] data) { `YPe^!`$
quickSort(data,0,data.length-1); >9ob *6q,
} yH*hL0mO
private void quickSort(int[] data,int i,int j){ ODm&&W#*
int pivotIndex=(i+j)/2; %B@!
//swap >^dyQyK
SortUtil.swap(data,pivotIndex,j); $0_^=DEW
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int k=partition(data,i-1,j,data[j]); M|d={o9Hp
SortUtil.swap(data,k,j); djWcbC=g_
if((k-i)>1) quickSort(data,i,k-1); )D;*DUtMVm
if((j-k)>1) quickSort(data,k+1,j); ~e{H#*f&1/
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} d^PD#&"g
/** :4|M
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* @param data S@x}QQ|.
* @param i UEzsDJu
* @param j 1!vPc93 $$
* @return R,%_deV\(
*/ YydA6IK4
private int partition(int[] data, int l, int r,int pivot) { ?]^zD k@~
do{ @<2d8ed
while(data[++l] while((r!=0)&&data[--r]>pivot); Bz?l{4".
SortUtil.swap(data,l,r); c7\VTYT
} zxkM'8JC
while(l SortUtil.swap(data,l,r); K}x_nW
return l; 1pK6=-3w3
} ^K+:C;Q|
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改进后的快速排序: f-4.WW2FN
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package org.rut.util.algorithm.support; -IadHX}]t
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import org.rut.util.algorithm.SortUtil; >L gVj$Z
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/** B@ {&<
* @author treeroot ,of]J|
* @since 2006-2-2 P^pFqUL7#
* @version 1.0 w]nX?S8
*/ #Q}_e7t
public class ImprovedQuickSort implements SortUtil.Sort { )n( Q
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private static int MAX_STACK_SIZE=4096; F?9SiX[\
private static int THRESHOLD=10; Di> rO038
/* (non-Javadoc) WWNu:,
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) kx:jI^
*/ GX
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public void sort(int[] data) { /4*W DiH
int[] stack=new int[MAX_STACK_SIZE]; vg)Z]F=t(
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int top=-1; [[WF0q
int pivot; !;v.>.lw
int pivotIndex,l,r; OUI6
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stack[++top]=0; 9C/MRmv`
stack[++top]=data.length-1; v>H=,.`0\
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while(top>0){ ]3ifdGk
int j=stack[top--]; aE)by-'
int i=stack[top--]; T/l1qcf`wT
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pivotIndex=(i+j)/2; v*z(@<Y
pivot=data[pivotIndex]; {:bN/zV#
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SortUtil.swap(data,pivotIndex,j);
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//partition e"k/d<
l=i-1; OX\$ nQ\o
r=j; QB&BTT=!
do{ T_LLJ}6M
while(data[++l] while((r!=0)&&(data[--r]>pivot)); $'{=R 45Z
SortUtil.swap(data,l,r); jnJZ#=)
} :U'Cor
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while(l SortUtil.swap(data,l,r); e)@3m.
SortUtil.swap(data,l,j); X:EEPGE
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if((l-i)>THRESHOLD){ 7O)" `
stack[++top]=i; FOH@OY
stack[++top]=l-1; w<NyV8-hL
} <??umkV
if((j-l)>THRESHOLD){ 6o=G8y
stack[++top]=l+1; gl8Ib<{
stack[++top]=j; Q`ME@vz
} G-u]L7t&1
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} 6B" egYv
//new InsertSort().sort(data); \+m$
insertSort(data); *jITOR!uF`
} pK}=*y~$
/** ? mv:neh
* @param data o&SSvW
*/ pf&ag#nr
private void insertSort(int[] data) { t
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int temp; Fky?\ec
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); D-&an@
} ]s_8A`vm
} 2S~R !
} ZVih =Y-w
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} DHw<%Z-J
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