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快速排序: qp#Euq6
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package org.rut.util.algorithm.support; 5rCJIl.
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import org.rut.util.algorithm.SortUtil; s"w^E\>6
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/** !Y7$cU &
* @author treeroot ,WnZ^R/n
* @since 2006-2-2 kRb JK
* @version 1.0 )^4Ljb1
*/ L\c3D|
public class QuickSort implements SortUtil.Sort{ O\Z!7UQ$
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/* (non-Javadoc) n<> ^cD
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) xw_$1
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*/ |*h{GX.(
public void sort(int[] data) { /0|1xHs
quickSort(data,0,data.length-1); sMUpkU-
} K]M@t=
private void quickSort(int[] data,int i,int j){ t:P]bp^#
int pivotIndex=(i+j)/2; 5A|dhw
//swap f2SJ4"X
SortUtil.swap(data,pivotIndex,j); 0o6o<ggi
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int k=partition(data,i-1,j,data[j]); U#iW1jPE2
SortUtil.swap(data,k,j); y\-iGKz{0
if((k-i)>1) quickSort(data,i,k-1); 6|3 X*Orn
if((j-k)>1) quickSort(data,k+1,j); 2|B@s3a
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} D/4]r@M2c
/** OQ 4h8,
* @param data `Eu,SvkF w
* @param i Pw7uxN`
* @param j gE=9K @
* @return ?P>4H0@I+
*/ d^!3&y&
private int partition(int[] data, int l, int r,int pivot) { ru`U/6n
do{ 9h)8Mq+M
while(data[++l] while((r!=0)&&data[--r]>pivot); /Qef[$!(
SortUtil.swap(data,l,r); B|$o.$5
} '
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while(l SortUtil.swap(data,l,r); mQ`2c:Rn&7
return l; D2gyn-]\
} \awkt!Wa
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} W$;qhB
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改进后的快速排序: }oSgx
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package org.rut.util.algorithm.support; _29wQn@]
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import org.rut.util.algorithm.SortUtil; (aSuxl.Dq
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/** uW FyI"
* @author treeroot f/IQ2yT-:D
* @since 2006-2-2 (3!6nQj-t
* @version 1.0 Fo;:GX,b
*/ jrz.n4Y`
public class ImprovedQuickSort implements SortUtil.Sort { WQiRbb X
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private static int MAX_STACK_SIZE=4096; &HAu;u@
private static int THRESHOLD=10; ^EkxZ4*g
/* (non-Javadoc) &y