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快速排序: *IV_evgM7
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package org.rut.util.algorithm.support; "XWO#,Ue
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import org.rut.util.algorithm.SortUtil; 1D2Yued
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/** eWU@@$9
* @author treeroot 7cly{U"
* @since 2006-2-2 _aK4[*jnqh
* @version 1.0 V J]S"
*/ SEsLJ?Dv0
public class QuickSort implements SortUtil.Sort{ _>(qQ-Px
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/* (non-Javadoc) C25 2E
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) nYts[f9e
*/ cB|Rj}40v
public void sort(int[] data) { :WAFBK/x
quickSort(data,0,data.length-1); O%p+P<J
} } .'\IR
private void quickSort(int[] data,int i,int j){ ?/FCq6o
int pivotIndex=(i+j)/2; g<jgR*TE`
//swap O`D,> =[
SortUtil.swap(data,pivotIndex,j); Uq:CM6q\
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int k=partition(data,i-1,j,data[j]); !y-,r4\@`
SortUtil.swap(data,k,j); ~v^I*/uY
if((k-i)>1) quickSort(data,i,k-1); BM_Rlcx~
if((j-k)>1) quickSort(data,k+1,j); wSIfqf+y
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} %G/j+Pf
/**
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* @param data
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* @param i B|.8+Q
* @param j =` KV),\
* @return CK#SD|~:
*/
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private int partition(int[] data, int l, int r,int pivot) { ]97`=,OUg
do{ 'X/(M<c
while(data[++l] while((r!=0)&&data[--r]>pivot); 7MhN>a;A\
SortUtil.swap(data,l,r); y)0wM~E;2
} MfK}DEJK,
while(l SortUtil.swap(data,l,r); 'D17]Lp~.
return l; UY`U[#
} H3Sfz'
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} P=PVOt@
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改进后的快速排序: 82A[[^`
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package org.rut.util.algorithm.support; XpoEZ|0
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import org.rut.util.algorithm.SortUtil; ^UiSezcI
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/** C ehz]C
* @author treeroot 8D1+["&
* @since 2006-2-2 _0
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* @version 1.0 Q|i`s=|
*/ Lzy Ix!S
public class ImprovedQuickSort implements SortUtil.Sort { ZG bY
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private static int MAX_STACK_SIZE=4096; x&