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快速排序: ?vht~5'
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package org.rut.util.algorithm.support; {jx#^n&5R
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import org.rut.util.algorithm.SortUtil; -tK;RQYax
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/** 6?<`wGs(
* @author treeroot }OX>(
* @since 2006-2-2 WRLu3nBx
* @version 1.0 (_%JF[W
*/ 0f=N3)
public class QuickSort implements SortUtil.Sort{ C~
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/* (non-Javadoc) \K_!d]I {
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) D:6x*+jah)
*/ lvz:UWo
public void sort(int[] data) { Y00i{/a 8
quickSort(data,0,data.length-1); eBYaq!t
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} U"%8"G0)
private void quickSort(int[] data,int i,int j){ #/XK&(X
int pivotIndex=(i+j)/2; I).^,%>Z)
//swap O'&X aaZV
SortUtil.swap(data,pivotIndex,j); -+
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int k=partition(data,i-1,j,data[j]); rvoS52XG,
SortUtil.swap(data,k,j); B!E<uVC
if((k-i)>1) quickSort(data,i,k-1); Tl/Dq(8JH
if((j-k)>1) quickSort(data,k+1,j); .f.j >
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} h>L6{d1
/** gE6y&a
* @param data JI[rIL\Ey
* @param i HZr/0I?
* @param j 9%)& }KK|
* @return *2m&?,nJ
*/ I8-&.RE
private int partition(int[] data, int l, int r,int pivot) { T h- vG
do{ u
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while(data[++l] while((r!=0)&&data[--r]>pivot); a,0o{*(u$
SortUtil.swap(data,l,r); 7"CH\*%
} ! 4^L $
while(l SortUtil.swap(data,l,r); w3?t})PB&
return l; h}B# 'e
} k`4\.m"&
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改进后的快速排序: 6'sFmC
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package org.rut.util.algorithm.support; 4Igs\x{i
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import org.rut.util.algorithm.SortUtil; S>ylA U;N
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/** ~3-YxCn%
* @author treeroot @Qsg.9N3K
* @since 2006-2-2 ,w58n%)H
* @version 1.0 OrH1fhh
*/ d[Fr
public class ImprovedQuickSort implements SortUtil.Sort { [q+39
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private static int MAX_STACK_SIZE=4096; PA-0FlV|
private static int THRESHOLD=10; _~#C $-T
/* (non-Javadoc) 7Hkf7\JY
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Z FrXw+
*/ WO*WAP)n
public void sort(int[] data) { ?KuJs9SM
int[] stack=new int[MAX_STACK_SIZE]; I3[RaZ2z{
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int top=-1; #pn AK
int pivot; 7Caap/L:
int pivotIndex,l,r; 7;s0m0<%~
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stack[++top]=0; @/2wmza%2
stack[++top]=data.length-1; ?bYQZJ>&
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while(top>0){ 8RT0&[
int j=stack[top--]; 9M~$W-5
int i=stack[top--]; iU+,Jeu
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pivotIndex=(i+j)/2; V^5k>`A
pivot=data[pivotIndex]; C%o/
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SortUtil.swap(data,pivotIndex,j); V'h z1roe
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//partition pO+wJ|f
l=i-1; dSD}NM
r=j; T`<k4ur
do{ aeLo;!Jh
while(data[++l] while((r!=0)&&(data[--r]>pivot)); *8eh%3_$h
SortUtil.swap(data,l,r); r|BKp,u9
} QMpA~x_m
while(l SortUtil.swap(data,l,r); 90696v.
SortUtil.swap(data,l,j); x=|@AFI
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if((l-i)>THRESHOLD){ %.gjBI=
stack[++top]=i; ~(P\F&A(&
stack[++top]=l-1; q$*_C kT
} bN%MT#X
if((j-l)>THRESHOLD){ DQXx}%Px
stack[++top]=l+1; JV{!Ukuyp+
stack[++top]=j; {$=%5
} aL6 5t\2
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} I,Y^_(JW
//new InsertSort().sort(data); ,(?4T~
insertSort(data); 3/<^R}w\
} xyCcd=
/** 6>7LFV1tvy
* @param data #`wfl9tj
*/ .f<,H+ m^
private void insertSort(int[] data) { o6%f%:&
int temp; "Z?":|%7
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 4B>|Wft{p]
} O@&I.d$
} j`hbQp\`
} $)a5;--W
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} uT2cHzqKB
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