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快速排序: vB%os Qm
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package org.rut.util.algorithm.support; Z0[d;m*
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import org.rut.util.algorithm.SortUtil; I<rT\':9
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/** Y:R*AOx
* @author treeroot cN-$;Ent
* @since 2006-2-2 !pZ<{|cH
* @version 1.0 w,az{\
*/ bE;c&g
public class QuickSort implements SortUtil.Sort{ @h9QfJ_f
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/* (non-Javadoc) G*f\
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) G}Ko*:fWS
*/ +#Wwah$
public void sort(int[] data) { E&N~h|CL
quickSort(data,0,data.length-1); Za,myuI+
} 2){O&8 A
private void quickSort(int[] data,int i,int j){ unih"};ou
int pivotIndex=(i+j)/2; [MuZ^'dR
//swap ^=k=;
SortUtil.swap(data,pivotIndex,j); %P7qA
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int k=partition(data,i-1,j,data[j]); 9a]{|M9
SortUtil.swap(data,k,j); guG&3{&\s
if((k-i)>1) quickSort(data,i,k-1); ?rjB9AC_;t
if((j-k)>1) quickSort(data,k+1,j); s"XwO8yhM
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} wB bCGU
/** d%UzQ*s
* @param data d
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* @param i fD lo L
* @param j inFS99DKx
* @return SpImd IpD
*/ S@'%dN6e
private int partition(int[] data, int l, int r,int pivot) { >C19Kie72
do{ ah%Ws#&
while(data[++l] while((r!=0)&&data[--r]>pivot); v[2&0&!K#
SortUtil.swap(data,l,r); wBvVY3VQ^
} )Gm9x]SVl
while(l SortUtil.swap(data,l,r); Mg2 e0}{
return l; d@ >i=l [
} '$c9 S[
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} 4i
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改进后的快速排序: :G6aO
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package org.rut.util.algorithm.support; ="5D}%
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import org.rut.util.algorithm.SortUtil; op\$(7<d-
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/** cS'{h
* @author treeroot >[Wjzg
* @since 2006-2-2 .9J}Z^FD
* @version 1.0 =kfa1kD&{
*/ ,l6,k<
public class ImprovedQuickSort implements SortUtil.Sort { x(cv}#}S8
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private static int MAX_STACK_SIZE=4096; pr,,E[
private static int THRESHOLD=10; lcm3wJ'w
/* (non-Javadoc) J8!2Tt
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 9(J,&)J
*/ )
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public void sort(int[] data) { 5 ty2e`~K
int[] stack=new int[MAX_STACK_SIZE]; ,f2oO?L}
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int top=-1; $L 8>Ha}
int pivot; F_(~b
int pivotIndex,l,r; rHTZM,zM=H
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stack[++top]=0; 4U\}"Mk
stack[++top]=data.length-1; ",.f
= V2Rq(jH
while(top>0){ RARA _tii
int j=stack[top--]; xy]O8>b
int i=stack[top--]; h@Ea5x
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pivotIndex=(i+j)/2; \1jThJn
pivot=data[pivotIndex]; J?w_DQa
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SortUtil.swap(data,pivotIndex,j); ?a3wBy
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//partition 1oej<67PdJ
l=i-1; {#qUZ z-
r=j; :31_WJ^
do{ b^Z2Vf:k]
while(data[++l] while((r!=0)&&(data[--r]>pivot)); <7VLUk}
SortUtil.swap(data,l,r); /iFn=pk1?
} s|e.mZk/
while(l SortUtil.swap(data,l,r); Tv DSs])
SortUtil.swap(data,l,j); NgDhdOB
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if((l-i)>THRESHOLD){ KU,SAcfR7
stack[++top]=i; |y U!d
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stack[++top]=l-1; A.vAk''(}+
} Y2x|6{ #
if((j-l)>THRESHOLD){ SYYx>1;8`
stack[++top]=l+1; C P}fxDW
stack[++top]=j; iz# R)EB/g
} ^A@f{g$KB+
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} /e0B$UymFu
//new InsertSort().sort(data); b!]O]dk#
insertSort(data); oZiW4z*Wh
} iAk:CJ{
/** ?>h
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* @param data ksv]
*/ $&as5z8
private void insertSort(int[] data) { _d@YLd78P
int temp; ]zol?
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); <{kPa_`'
} vTK%4=|1}!
} /yG34) aB
} Ic2?1<I ZA
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} Wk0E7Pr
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