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快速排序: :8yebOs
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package org.rut.util.algorithm.support; rJiF2 W
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import org.rut.util.algorithm.SortUtil; x6cG'3&T
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/** A/y|pg5
* @author treeroot c=v016r\
* @since 2006-2-2 bxE~tsM"@Y
* @version 1.0 aL(G0@(
*/ j4XVk@'OX
public class QuickSort implements SortUtil.Sort{ 64'2ICf#m
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/* (non-Javadoc) Snkb^Kt
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ffP]U4
*/ rN1]UaT
public void sort(int[] data) { P'KA-4!
quickSort(data,0,data.length-1); ]L3U2H`7
} Q>5f@aN
private void quickSort(int[] data,int i,int j){ AXbb-GK
int pivotIndex=(i+j)/2; h0F=5| B
//swap {
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SortUtil.swap(data,pivotIndex,j); ]xRR/S4
, Q0Y} )
int k=partition(data,i-1,j,data[j]); ?`+VWa[,e
SortUtil.swap(data,k,j); .@{v{
if((k-i)>1) quickSort(data,i,k-1); {V7mpVTX.
if((j-k)>1) quickSort(data,k+1,j); %pVsafV
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} k]ZE j/y~
/** EjfQF C
* @param data EV6R[2kl
* @param i b
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* @param j 7;Ze>"W>
* @return +3o
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*/ Sh#N5kgD
private int partition(int[] data, int l, int r,int pivot) { 1uw1(iL+
do{ .=:f]fs
while(data[++l] while((r!=0)&&data[--r]>pivot); A;8kC}
SortUtil.swap(data,l,r); jU-LT8y:
} _|e&zr
while(l SortUtil.swap(data,l,r); +.Vh<:?
return l; <y7{bk~i
} db 99S
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} G@P;#l`(D
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改进后的快速排序: j&