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快速排序: S@rsQ@PA
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package org.rut.util.algorithm.support; l.LFlwt
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import org.rut.util.algorithm.SortUtil; +[go7A$5
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/** W(3~F2
* @author treeroot e?'k[ES^
* @since 2006-2-2 V3Rnr8
* @version 1.0 ]q\=
*/ '$&(+>)z`
public class QuickSort implements SortUtil.Sort{ 1pBsr(
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/* (non-Javadoc) %nK15(
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ?}>B4Z)
*/ 0yEyt7
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public void sort(int[] data) { )SZ,J-H08w
quickSort(data,0,data.length-1); 5=;I|l,
} bKbpI>;[
private void quickSort(int[] data,int i,int j){ d%|#m)
int pivotIndex=(i+j)/2; !D]6Cq
//swap '}[L sU
SortUtil.swap(data,pivotIndex,j); c^/?VmCQ}
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int k=partition(data,i-1,j,data[j]); g960;waz3
SortUtil.swap(data,k,j); ;|e 0{Jrz
if((k-i)>1) quickSort(data,i,k-1); I<o4 l[--
if((j-k)>1) quickSort(data,k+1,j); ~+NFWNgN
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} J}` $WL:
/** Q $,kB<M
* @param data
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* @param i _TeRsA
* @param j EYj2h
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* @return %QcG^R
*/ DT~y^h
private int partition(int[] data, int l, int r,int pivot) { \<+47+
do{ pHbguoH,
while(data[++l] while((r!=0)&&data[--r]>pivot); 3lEU$)QA3
SortUtil.swap(data,l,r); x)Om[jZE
} 5~TA(cb5
while(l SortUtil.swap(data,l,r); N`^W*>XB
return l; KPvYq?F>4
} _1bd)L&dF
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} HK4`@jYQ
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改进后的快速排序: NNrZb?
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package org.rut.util.algorithm.support; `e69kBAm
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import org.rut.util.algorithm.SortUtil; %^BOYvPx
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/** [==Z1Q;=
* @author treeroot ]3cf}Au
* @since 2006-2-2 0a-:x4
* @version 1.0 u~Cqdr5
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*/ I&@@v\$*
public class ImprovedQuickSort implements SortUtil.Sort { \:^n-D*fX
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private static int MAX_STACK_SIZE=4096; RJm8K,3#
private static int THRESHOLD=10;
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/* (non-Javadoc) _ r)hr7
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ,,-3p#Pbw
*/ p{QKj3ov
public void sort(int[] data) { u>Kvub
int[] stack=new int[MAX_STACK_SIZE]; ?ew]i'9(
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int top=-1; ^bw~$*"j#
int pivot;
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int pivotIndex,l,r; ap_+C~%+
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stack[++top]=0; KTREOOu .t
stack[++top]=data.length-1; S~9kp?kR$
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while(top>0){ G+yz8@
int j=stack[top--]; ~_\2\6%1^n
int i=stack[top--]; @Bwl)G!|
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pivotIndex=(i+j)/2; <%5uzlp
pivot=data[pivotIndex]; 545xs`Q_
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SortUtil.swap(data,pivotIndex,j); G#M]\)f%
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//partition Q&\ksM
l=i-1; /JYi^rZ
r=j; x1ex}_\
do{ ,;& PKY
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 90I3_[Ii
SortUtil.swap(data,l,r); yUlQPrNX
} r>eXw5Pr7
while(l SortUtil.swap(data,l,r); XfDQx!gJ
SortUtil.swap(data,l,j); <]`2H}*U'
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if((l-i)>THRESHOLD){ cjpl_}'L:
stack[++top]=i; spDRQ_qq
stack[++top]=l-1; !ry+ r!"
} PQ|x?98
if((j-l)>THRESHOLD){ :G)x+0u
stack[++top]=l+1; 4s2ex{$+MA
stack[++top]=j; hkc_>F]Hx
} aB_z4dqwU
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} :
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//new InsertSort().sort(data); 9e6{(
insertSort(data); mw%_yDZ{
} Z@umbyM
/** gQGiph |
* @param data eT?LMBn\
*/ +t6m>IBu
private void insertSort(int[] data) { t,YAk
?}
int temp; )&-+:u0
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 3xY]Lqwv
} #bH[UId[
} a}{! %5
} GDntGTE~sk
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} |e(x< [s5
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