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快速排序: +jv&V%IL
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package org.rut.util.algorithm.support; ^DaP^<V
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import org.rut.util.algorithm.SortUtil; <q<kqy5s-R
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/** p2)563#RS
* @author treeroot pIbm)-
* @since 2006-2-2 &}."sGK
* @version 1.0 F-&=N {+
*/ muZ6 }&4
public class QuickSort implements SortUtil.Sort{ !J/fJW>m6
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/* (non-Javadoc) (imaL,M-D
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) R{0nk
*/ AzlZe\V?)~
public void sort(int[] data) { &?wNL@n
quickSort(data,0,data.length-1); #ts;s\!
} Q[Xh{B
private void quickSort(int[] data,int i,int j){ _
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int pivotIndex=(i+j)/2; GyP.;$NHa[
//swap 7#G8qh<
SortUtil.swap(data,pivotIndex,j); 8
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int k=partition(data,i-1,j,data[j]); tpQ?E<O
SortUtil.swap(data,k,j); 9`8D Ga
if((k-i)>1) quickSort(data,i,k-1); R32A2Ml
if((j-k)>1) quickSort(data,k+1,j); KN\*|)
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} !\(j[d#
/** BK/~2u
* @param data f?[0I\V[$
* @param i J6s@}@R1
* @param j 'ai3f
* @return wx]r{
*/ o)}M$}4
private int partition(int[] data, int l, int r,int pivot) { X
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do{ ,!i!q[YkL9
while(data[++l] while((r!=0)&&data[--r]>pivot); 67]kT%0
SortUtil.swap(data,l,r); ;+6TZqklQ
} ("!P_Q#
while(l SortUtil.swap(data,l,r); .9'bi#:Cw
return l; 7{fOo%(7
} POl_chq
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} G-#]|)
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改进后的快速排序: :u4q.^&!e
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package org.rut.util.algorithm.support; )u67=0s2i+
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import org.rut.util.algorithm.SortUtil; mQiVTIP3[O
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/** CA8N
* @author treeroot S`?L\R.:
* @since 2006-2-2 X) O9PQ
* @version 1.0 : l&g5
*/ A."]6R<
public class ImprovedQuickSort implements SortUtil.Sort { e4rhB"qQdn
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private static int MAX_STACK_SIZE=4096; Ee0}Xv
private static int THRESHOLD=10; R'e>YDC
/* (non-Javadoc) <{"Jy)Uf
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) '}pe$=
*/ H-ewO8@
public void sort(int[] data) { R|OY5@
int[] stack=new int[MAX_STACK_SIZE]; :.J]s<J(F
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int top=-1; G1z0q3< B
int pivot; Qi?xx')
int pivotIndex,l,r; =E~)svl6g
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stack[++top]=0; hY5tBL
stack[++top]=data.length-1; -q6d&D'B+
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while(top>0){ [:Y`^iR.
int j=stack[top--]; </@3}rfUPg
int i=stack[top--]; S1&Df%Ra
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pivotIndex=(i+j)/2; o+F]80CH
pivot=data[pivotIndex]; )Co&(;zf
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SortUtil.swap(data,pivotIndex,j); z pV+W-j]
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//partition E3`&W8
l=i-1; O\=c&n~`
r=j; g*a|QBj%
do{ 3`3`iN!8\@
while(data[++l] while((r!=0)&&(data[--r]>pivot)); ckCb)r_
SortUtil.swap(data,l,r); oe,37xa4
} 2Ysl|xRo
while(l SortUtil.swap(data,l,r); ZBcT@hxm
SortUtil.swap(data,l,j); @b2JR^
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if((l-i)>THRESHOLD){ `j1(GQt
stack[++top]=i; ?V>{3
stack[++top]=l-1; ;c;5O@R}3
} S(MVL!Lm
if((j-l)>THRESHOLD){ x}(p\Efx
stack[++top]=l+1; 1 ^q~NYTK
stack[++top]=j; trAIh}Dj
} s?-J`k~q
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} Sru}0M#M
//new InsertSort().sort(data); W2-1oS~ma
insertSort(data); |',$5!:0O
} H}}g\|r&
/** n k@e#
* @param data ZL{\M|@jz
*/ ,- FC
private void insertSort(int[] data) {
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int temp; 10`]&v]T
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); >|!s7.H/J/
} .e|VW)
} F `cuV
} G;k#06
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