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快速排序: Rc[ 0aj:
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package org.rut.util.algorithm.support; OH6^GPF6
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import org.rut.util.algorithm.SortUtil; ?=Db@97
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/** \we\0@v
* @author treeroot ?&X6:KJQ
* @since 2006-2-2 HpW 42
* @version 1.0 SVWIEH0?
*/ $t/rOo9cV
public class QuickSort implements SortUtil.Sort{ 9&Ne+MY^%
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/* (non-Javadoc) ?+2b(2&MXE
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) PmX2[7
*/ sL^yB
public void sort(int[] data) { @ -:]P8
quickSort(data,0,data.length-1); |/`%3'4H
} }-DE`c
private void quickSort(int[] data,int i,int j){ @;Opx."
int pivotIndex=(i+j)/2; }< 5F
//swap .Zmp ,
SortUtil.swap(data,pivotIndex,j); zsXpA0~3s
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int k=partition(data,i-1,j,data[j]); v?:: |{
SortUtil.swap(data,k,j); [xZU!=
if((k-i)>1) quickSort(data,i,k-1); G"dS+,Q
if((j-k)>1) quickSort(data,k+1,j); OJO!FH)
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} GK*v{`
/** y9l*m~
* @param data O4iC]5@
* @param i rN/|(@
* @param j /JJw 6[N
* @return n,'OiVl[
*/ h9s >LY
private int partition(int[] data, int l, int r,int pivot) { &1|?BZv
do{ K>/%X!RW
while(data[++l] while((r!=0)&&data[--r]>pivot); \2C`<h$fN
SortUtil.swap(data,l,r); (bp9Pj w
} D=r))
while(l SortUtil.swap(data,l,r); Iah[j,]r
return l; 0s#Kp49-
} _BM4>r?\
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} Orn0Zpp<z
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改进后的快速排序: f9u^ R=Ff[
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package org.rut.util.algorithm.support; ]< l6s
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import org.rut.util.algorithm.SortUtil; PmpNAVE'
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/** iBg3mc@OO
* @author treeroot uQ1@b-e`5
* @since 2006-2-2 9!',b>C6
* @version 1.0
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*/ XOP"Px@
public class ImprovedQuickSort implements SortUtil.Sort { hfWFD,
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private static int MAX_STACK_SIZE=4096; 2x]>l?
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private static int THRESHOLD=10; 7,
}
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/* (non-Javadoc) 8IQtz2
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) A7_4.VH
*/ ZP\M9Ja
public void sort(int[] data) { bm~W
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int[] stack=new int[MAX_STACK_SIZE]; C4$:mJ>y
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int top=-1; 1T&Rc4$Sn7
int pivot; - YqYcer
int pivotIndex,l,r; b}^S.;vNj
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stack[++top]=0; @$^bMIj@W
stack[++top]=data.length-1; JuR"J1MY
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while(top>0){ G3P&{.v
int j=stack[top--]; LkruL_E>
int i=stack[top--]; *iO u'
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pivotIndex=(i+j)/2; n:
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pivot=data[pivotIndex]; N?Q+>
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SortUtil.swap(data,pivotIndex,j); #p(h]T32
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//partition r|Z3$J{^"
l=i-1; $``1PJoi
r=j; !LMN[3M_
do{ Dr&('RZ4
while(data[++l] while((r!=0)&&(data[--r]>pivot)); |y;}zQB-dH
SortUtil.swap(data,l,r); )>
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} VZr>U*J[:
while(l SortUtil.swap(data,l,r); {Bs~lC$
SortUtil.swap(data,l,j); ia&AW
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if((l-i)>THRESHOLD){ e~%
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stack[++top]=i; !)"%),>}o
stack[++top]=l-1; RcG0 8p.)
} -H^oXeN
if((j-l)>THRESHOLD){ E907fX[R~
stack[++top]=l+1; <#=N
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stack[++top]=j; /@ !CKh`
} :o-,SrORM
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} {N2g8W:
//new InsertSort().sort(data); RoA?p;]<
insertSort(data); W:,4 :|3
} 9O`
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/** 6fH@wQ"wN
* @param data q\Q{sv_
*/ (/!r(#K0,'
private void insertSort(int[] data) { #4MBoN(3
int temp; <9E0iz+j
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); ptatzp]c#
} O<PO^pi
} 6vuq1
} [Aj Q#;#Q
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} Ee)[\Qjn
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