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快速排序: |99eDgK,
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package org.rut.util.algorithm.support; I%Z&i-33y
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import org.rut.util.algorithm.SortUtil; 9q?gmAn.
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/** |HLh?AcX
* @author treeroot "cx" d:
* @since 2006-2-2 8z&9
* @version 1.0 )U`
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*/ y\x<!_&D
public class QuickSort implements SortUtil.Sort{ QHK$
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/* (non-Javadoc) "2-TtQV!
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) .jU9{;[
*/ Rk<:m+V=
public void sort(int[] data) { 7VraWW`H'
quickSort(data,0,data.length-1); #@G2n@Hj
} O?_'6T
private void quickSort(int[] data,int i,int j){ (,>`\\
int pivotIndex=(i+j)/2; |d$aISO`
//swap xUYSD
SortUtil.swap(data,pivotIndex,j); jp|wc,]!
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int k=partition(data,i-1,j,data[j]); w}iflAnjq
SortUtil.swap(data,k,j); PNq#o%q
if((k-i)>1) quickSort(data,i,k-1); U4gZW]F
if((j-k)>1) quickSort(data,k+1,j); kI]1J
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} Z6I!4K
/** 4d O>L"
* @param data {221@ zcCq
* @param i Uvp?HZ\Z
* @param j p w,.*N3P
* @return ^U1;5+2G+~
*/ C/XOI>
private int partition(int[] data, int l, int r,int pivot) { *+G K?Ga
do{ Z7 @#0;g{
while(data[++l] while((r!=0)&&data[--r]>pivot); 5HB4B <2
SortUtil.swap(data,l,r); aPbHrk*/
} m$kmoY/
while(l SortUtil.swap(data,l,r); eWFlJ;=
return l; NQb?&.C
} Y\rKw!u_!
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} E'C[+iK6,
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改进后的快速排序: 2iUF%>
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package org.rut.util.algorithm.support; &CS= *)>$
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import org.rut.util.algorithm.SortUtil; Xd4~N:
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/** N7NK1<vw2
* @author treeroot vt1!|2{
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* @since 2006-2-2 F$caKWzny5
* @version 1.0 V3UEuA
*/ b_B4
public class ImprovedQuickSort implements SortUtil.Sort { H;v*/~zl
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private static int MAX_STACK_SIZE=4096; Q<M>+U;t
private static int THRESHOLD=10; Z$q}y
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/* (non-Javadoc) Ft07>E$/Q^
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) F:n7yey
*/ D;Z\GnD
public void sort(int[] data) { H.YntFtD'
int[] stack=new int[MAX_STACK_SIZE]; U+\\#5$
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int top=-1; S -im
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int pivot; ETmfy}V8
int pivotIndex,l,r; f\Qi()
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stack[++top]=0; 1vX97n<}
stack[++top]=data.length-1; 1v`*%95
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while(top>0){ lLnD%*03
int j=stack[top--]; 7r:!HmRl
int i=stack[top--]; Wu:evaZ:i
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pivotIndex=(i+j)/2; aC;OFINK
pivot=data[pivotIndex]; |A"zxNeS"
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SortUtil.swap(data,pivotIndex,j); Qax=_[r
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//partition ?xIwQd0
l=i-1; E<0Y;tR
r=j; [/'W#x
do{ 3d[fP#NY7
while(data[++l] while((r!=0)&&(data[--r]>pivot)); c!b4Y4eJ
SortUtil.swap(data,l,r); xse8fGs
} Uh{|@D
while(l SortUtil.swap(data,l,r); {ymD.vf=9+
SortUtil.swap(data,l,j); m#ID%[hg$
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if((l-i)>THRESHOLD){ {ZB7,\
stack[++top]=i; 2Lm.;l4YO
stack[++top]=l-1; Ww:,O48%
} \Gg6&:Ua
if((j-l)>THRESHOLD){ [8[g_
stack[++top]=l+1; `C$.
stack[++top]=j; M/T
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} Zh,(/-XN;
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} bs/Vn'CE
//new InsertSort().sort(data); HZKqGkE
insertSort(data); x:4:G(
} qi!+Ceo}
/** ,Tjc\;~%
* @param data ,:;ZzHzR0
*/ jYI\.bc
private void insertSort(int[] data) { '| WY 2>/(
int temp; JYc;6p$<i
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); @p"m{
} '>4H#tu
} b"iPuN!p
} b*(74 >XY
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} ir!/{IQx
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