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快速排序: R)ERxz#
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package org.rut.util.algorithm.support; <lUOJV{&\
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import org.rut.util.algorithm.SortUtil; >D 97c|?c
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/** [+;qWfs B
* @author treeroot ))!Bg?t-
* @since 2006-2-2 #Mh{<gk%ax
* @version 1.0 X*i/A<Y`=
*/ / /'Tck
public class QuickSort implements SortUtil.Sort{ dd]?9
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/* (non-Javadoc) MhNFW'_
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) rah,dVE]
*/ }.p<wCPy6
public void sort(int[] data) { + :V rip
quickSort(data,0,data.length-1); /D<"wF }@J
} OA[&Za#w
private void quickSort(int[] data,int i,int j){ P}0*{%jB
int pivotIndex=(i+j)/2; F*M|<E=
//swap moMYdArj
SortUtil.swap(data,pivotIndex,j); >&OUGu|
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int k=partition(data,i-1,j,data[j]); zrs<#8!Y_!
SortUtil.swap(data,k,j); (:5G#?6,
if((k-i)>1) quickSort(data,i,k-1); 9qKzS<"h
if((j-k)>1) quickSort(data,k+1,j); [QT1Ju64
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} !YiuwFt
/** 98fu>>*G{
* @param data l[ne/O
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* @param i Ir5WN_EaS
* @param j h35Hu_c&
* @return 1"}cdq.
*/ 77V
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private int partition(int[] data, int l, int r,int pivot) { 9}5K6aQ
do{ CswE
while(data[++l] while((r!=0)&&data[--r]>pivot); in<}fAro6
SortUtil.swap(data,l,r); yPV'pT)
} )t:7_M3
while(l SortUtil.swap(data,l,r); sc W'AJJq
return l; _d@=nK)
} 3J{vt"dS
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改进后的快速排序: G/vC~6x
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package org.rut.util.algorithm.support; 6 "U8V?E
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import org.rut.util.algorithm.SortUtil; C9qJP^F
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/** ubYG
* @author treeroot 'xnnLCm.
* @since 2006-2-2 N
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* @version 1.0 HRB[GP+
*/ fTqC:r|st
public class ImprovedQuickSort implements SortUtil.Sort { o%[U
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private static int MAX_STACK_SIZE=4096; #D*r]M
private static int THRESHOLD=10; w5KPB5/zu
/* (non-Javadoc) xY\0zQ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) auHFir8f
*/ u3J?bR
public void sort(int[] data) { T@[! A);
int[] stack=new int[MAX_STACK_SIZE]; f?56=& pHY
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int top=-1; RKZ6}q1n
int pivot; x0Yse:RE^
int pivotIndex,l,r; S[,8TErz
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stack[++top]=0; :!fG; )=
stack[++top]=data.length-1; *1{S*`|cJy
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while(top>0){ :jEPu3E:
int j=stack[top--]; @]HXP_lyD/
int i=stack[top--]; w!SkWS b,~
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pivotIndex=(i+j)/2; T[?6[,.
pivot=data[pivotIndex]; w,1Ii }d9
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SortUtil.swap(data,pivotIndex,j); ^YvB9XN
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//partition dQb.BOI)h
l=i-1; Xm1[V&
r=j; nkDy!"K
do{ x;\wY'
while(data[++l] while((r!=0)&&(data[--r]>pivot)); nZy X_J,Vd
SortUtil.swap(data,l,r); %7hB&[ 5
} RthT\%R
while(l SortUtil.swap(data,l,r); PX(pX>
SortUtil.swap(data,l,j); aqU'
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if((l-i)>THRESHOLD){ ]i*](UQ
stack[++top]=i; *e#<n_%R
stack[++top]=l-1; jZoNi
} 7piuLq+
if((j-l)>THRESHOLD){ <plC_{Y:wu
stack[++top]=l+1; w$Ot{i|$(
stack[++top]=j; .lgPFr6X
} f.B>&%JRZ
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} _c$9eAe
//new InsertSort().sort(data); B[4pX
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insertSort(data); JPn$FQD
} k>jbcSY(z<
/** _ee
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* @param data 7Q w|!
*/ 6x)$Dl
private void insertSort(int[] data) {
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int temp; s@hRqGd:
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); D}C,![
} '_k+WH&
} :!a2]-D}
} '})0!g<Y
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} `+:.L>5([
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