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快速排序: yq,%ey8
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package org.rut.util.algorithm.support;
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import org.rut.util.algorithm.SortUtil; j87IxB?o
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/** \*x=q20
* @author treeroot =2tl149m/z
* @since 2006-2-2 uJ_"gPO
* @version 1.0 Q!(qL[o
*/ .=% ,DT"
public class QuickSort implements SortUtil.Sort{ (Gp|K6
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/* (non-Javadoc) >^V3Z{;
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) +f]\>{o4
*/ lBcRt)_O7
public void sort(int[] data) { qcdENIy0b
quickSort(data,0,data.length-1); ]>'yt #]
} }rbsarG@
private void quickSort(int[] data,int i,int j){ [R9!Tz
int pivotIndex=(i+j)/2; EC0M0qQ
//swap u4,b%h.
SortUtil.swap(data,pivotIndex,j); "YQ%j+
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int k=partition(data,i-1,j,data[j]); 5^GFN*poig
SortUtil.swap(data,k,j); !tr
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if((k-i)>1) quickSort(data,i,k-1); .0H!B#9
if((j-k)>1) quickSort(data,k+1,j); F)Qj<6
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} O,A}p:Pgs
/** l0g`;BI_
* @param data wG2-,\:
* @param i Q{))+'s2h
* @param j GK.U_` 4?
* @return 8~s-@3J
*/ AcCM
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private int partition(int[] data, int l, int r,int pivot) { z6
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do{ nbM7 >tnsk
while(data[++l] while((r!=0)&&data[--r]>pivot); f8X/kz
SortUtil.swap(data,l,r); YkqauyV^
} @Tl!A1y?
while(l SortUtil.swap(data,l,r); GP,xGZZ
return l; eV x
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} 7IV:X
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改进后的快速排序: /qalj\ud
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package org.rut.util.algorithm.support; DZ9qIc}Y
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import org.rut.util.algorithm.SortUtil; D_MNF=7
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/** avI
* @author treeroot &ivPY
* @since 2006-2-2 }bxx]rDl
* @version 1.0 `+go|
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*/ >RMp`HxDf
public class ImprovedQuickSort implements SortUtil.Sort { r31H Zx1^
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private static int MAX_STACK_SIZE=4096; \jcEEIEi
private static int THRESHOLD=10; l.wf= /
/* (non-Javadoc) /Vy8%
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) .O+qtk!
*/ ]CIZF,
public void sort(int[] data) { >&kb|)
int[] stack=new int[MAX_STACK_SIZE]; Pv(icf
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int top=-1; G?OwhX
int pivot; 9u\&kQxqD
int pivotIndex,l,r; BkTGH.4G%
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stack[++top]=0; fDa$TbhjI
stack[++top]=data.length-1; Cq0S8Or0
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while(top>0){ UkY
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