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快速排序: 4l>/6LNMF
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package org.rut.util.algorithm.support; Bd)Qz(>rw
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import org.rut.util.algorithm.SortUtil; %6dFACv
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/** 0SA
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* @author treeroot tAc[r)xFw
* @since 2006-2-2 H4Pj 3'
* @version 1.0 7S 1
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*/ vU&gFEWg
public class QuickSort implements SortUtil.Sort{ ~kw[Aw3?D\
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/* (non-Javadoc) SJj0*ry:
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Y <Ta2H
*/ )^L+iht
public void sort(int[] data) { Z!7#"wO9+V
quickSort(data,0,data.length-1); Bk~WHg>@G
} fqFE GyeNr
private void quickSort(int[] data,int i,int j){ vR-rCve$P
int pivotIndex=(i+j)/2; +n9]c~g!T0
//swap (/tbe@<
SortUtil.swap(data,pivotIndex,j); IWsB$T
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int k=partition(data,i-1,j,data[j]); N>'1<i?
SortUtil.swap(data,k,j); #&5m=q$EI
if((k-i)>1) quickSort(data,i,k-1); D=o9+5Slw
if((j-k)>1) quickSort(data,k+1,j); ?L+@?fVN
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} _
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/** Tg)Fr)
* @param data lmo>z'<
* @param i _:?)2 NV
* @param j %}x/fq
* @return $xa#+
*/ xaAJ>0IM
private int partition(int[] data, int l, int r,int pivot) { 8L9xP'[^
do{ p
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while(data[++l] while((r!=0)&&data[--r]>pivot); #4Xe zj,g*
SortUtil.swap(data,l,r); o[!]xmj
} [XhuJdr"u
while(l SortUtil.swap(data,l,r); `.>2h}op
return l; n$F&gx'^
} i/NY86A
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} F!tn|!~
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改进后的快速排序: o{(-jhR
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package org.rut.util.algorithm.support; XTXRC$B
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import org.rut.util.algorithm.SortUtil; 6,ylkf3
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/** IwiR2K
* @author treeroot bT@3fuL4
* @since 2006-2-2 .fk!~8b[Q+
* @version 1.0 &D\~-fOGb
*/ vA10'Gx'
public class ImprovedQuickSort implements SortUtil.Sort { wBTnI>l9[
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private static int MAX_STACK_SIZE=4096; wv #1s3
private static int THRESHOLD=10; ygW,4Vz7J
/* (non-Javadoc) 7N+No.vR.
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 5#p [Q _
*/ L0/0<d(K
public void sort(int[] data) { -4mUGh1dy
int[] stack=new int[MAX_STACK_SIZE]; MS%xOB*6
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int top=-1; 6=3}gd5
int pivot; nzmv>s&UW
int pivotIndex,l,r; Nc()$Nl8
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stack[++top]=0; L&+XFntR
stack[++top]=data.length-1; MM"{ehd{^a
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while(top>0){ SWvy<f4<
int j=stack[top--]; 0%7c?3#
int i=stack[top--]; V
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pivotIndex=(i+j)/2; 6 :K~w<mMJ
pivot=data[pivotIndex]; kep.+t[
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SortUtil.swap(data,pivotIndex,j); ev7Y^
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//partition ymT&[+V
l=i-1; GxL5yeN@(
r=j; qP-*
do{ 'Pk (
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while(data[++l] while((r!=0)&&(data[--r]>pivot)); /!rH DcR
SortUtil.swap(data,l,r); BY.'0,H=k
} a938l^@;s8
while(l SortUtil.swap(data,l,r); b/5
SortUtil.swap(data,l,j); OWT5Bjl
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if((l-i)>THRESHOLD){ (?Fz{
stack[++top]=i; by,"Orpwq;
stack[++top]=l-1; h1} x2
} 6;i]v|M-
if((j-l)>THRESHOLD){ )"s <hR,
stack[++top]=l+1; |f;u5r!^=
stack[++top]=j; ]f=108|8
} A6YkoYgC
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} `j{5$X
//new InsertSort().sort(data); ^noKk6Aaa
insertSort(data); V\r!H>
} :
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/** `?{i dg
* @param data '+LC.l M
*/ 9#L0Q%,*
private void insertSort(int[] data) { $e1==@
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int temp; >/k[6r5
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); //S/pCqED
} Sa7bl~p\
} t$m~O?I
} =S7Xj`/
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} kBg,U 8|S
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