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快速排序: sf|_2sI
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package org.rut.util.algorithm.support; 7J)a "d^e
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import org.rut.util.algorithm.SortUtil; &T|UAM.
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/** T`(;;%
* @author treeroot B 7x"ef
* @since 2006-2-2 eO"\UDBV
* @version 1.0 } SWA|x
*/ ZJ{+_ax0K
public class QuickSort implements SortUtil.Sort{ >cU*D:
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/* (non-Javadoc) %WXVfkD
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) AQ_#uxI'oa
*/ JOL Z2
public void sort(int[] data) { !W6
quickSort(data,0,data.length-1); *N&^bF"SF
} 7lBQd (
private void quickSort(int[] data,int i,int j){ F#3$p$;B$
int pivotIndex=(i+j)/2; r4z}yt+
//swap AS/\IHZ\
SortUtil.swap(data,pivotIndex,j); ?8aWUgl
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int k=partition(data,i-1,j,data[j]); t'_,9
SortUtil.swap(data,k,j); y:(C=*^<t
if((k-i)>1) quickSort(data,i,k-1); }lQn]q
if((j-k)>1) quickSort(data,k+1,j); n"`SL<K1
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} !x!L&p
/** _dRn0<#1(k
* @param data Lqf#,J
* @param i 83O^e&Bt
* @param j hPCSLJ
* @return z|4@nqqX
*/ >GF(.:7
private int partition(int[] data, int l, int r,int pivot) { tz \:r>3vI
do{ EJSgTtp2
while(data[++l] while((r!=0)&&data[--r]>pivot); E6KBpQcd[
SortUtil.swap(data,l,r); 5{x[EXE'
} +T8XX@#
while(l SortUtil.swap(data,l,r); #Z3I%bkw H
return l; 9zM4D
} @bVh?T0~F,
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} CI3_lWax%
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改进后的快速排序: 8^ ZM U{
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package org.rut.util.algorithm.support; My43\p
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import org.rut.util.algorithm.SortUtil; dpOL1rrE
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/** iLQt9Hyk
* @author treeroot HS7
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* @since 2006-2-2 r^Rcjyc1
* @version 1.0 =;-ju@d
*/ ?PU(<A+
public class ImprovedQuickSort implements SortUtil.Sort { oqU#I~ -
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private static int MAX_STACK_SIZE=4096; =S7C(;=4
private static int THRESHOLD=10; EKJc)|8
/* (non-Javadoc) W$ d{
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) VL,?91qwe
*/ nr9#3Lb
public void sort(int[] data) { W0 ,"V'C
int[] stack=new int[MAX_STACK_SIZE]; (H|d 3
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int top=-1; 9!/1F !
int pivot; l`w|o
int pivotIndex,l,r; tS.b5$Q
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stack[++top]=0;
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stack[++top]=data.length-1; whp\*]8
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while(top>0){ MxvxY,~{0
int j=stack[top--]; +sq,!6#G
int i=stack[top--]; >C d&K9H
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pivotIndex=(i+j)/2; Fl|&eO,e
pivot=data[pivotIndex]; EO!cv,[a
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SortUtil.swap(data,pivotIndex,j); {m*J95[
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//partition p 7E{es|J
l=i-1; SvpTs
r=j; F#C 6.`B
do{ U JRT4>G
while(data[++l] while((r!=0)&&(data[--r]>pivot)); _ .
SortUtil.swap(data,l,r); `0gK;D8t
} WOTu"Yj
while(l SortUtil.swap(data,l,r); ` vmk
SortUtil.swap(data,l,j); O%h
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if((l-i)>THRESHOLD){ FXwK9
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stack[++top]=i; yA )+-
stack[++top]=l-1; {*P7)
} sn-+F%[
if((j-l)>THRESHOLD){ !urd
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stack[++top]=l+1; q9Opa2
stack[++top]=j; Ku,A}5-6
} J+*Y)k
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} _EBDv0s
//new InsertSort().sort(data); lkJ#$Ik&
insertSort(data); Vy"^]5
} !(AFT!
/** MvwJ(3
* @param data K OHH74}_
*/ s 17gi,"X
private void insertSort(int[] data) { ) x O_
int temp;
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for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); wI]>0geb*
} hp%Pg &
} lcJumV=%>
} +OP:"Q_#
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} >knR>96
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