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快速排序: }fdo
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package org.rut.util.algorithm.support; 66!cfpM
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import org.rut.util.algorithm.SortUtil; $fL2w^ @
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/** i#=s_v8
* @author treeroot (@[c;+x
* @since 2006-2-2 $3w a%"
* @version 1.0 \$W>@w0
*/ n}}$-xl
public class QuickSort implements SortUtil.Sort{ \= =rdW-
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/* (non-Javadoc) }HRM6fR1S
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) (w`9*1NO
*/ #[ipJ %
public void sort(int[] data) { oYI7 .w
quickSort(data,0,data.length-1); }y;s(4
} 9Eu.Y
private void quickSort(int[] data,int i,int j){ 3%p^>D\
int pivotIndex=(i+j)/2; #Fm, mO$v
//swap ?%(:
SortUtil.swap(data,pivotIndex,j); f+d[Q1
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int k=partition(data,i-1,j,data[j]); ~QQi{92
SortUtil.swap(data,k,j); ef *Vs
if((k-i)>1) quickSort(data,i,k-1); unY+/p $
if((j-k)>1) quickSort(data,k+1,j); {d|e@`"T
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} S&^i*R4]
/** ;Hk{bz(
* @param data &>,c..Ke
* @param i Ahv %Q%m%2
* @param j g
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* @return /N>f#:}
*/ ?H3Ls~R
private int partition(int[] data, int l, int r,int pivot) { 8A}cxk
do{ W"MwpV
while(data[++l] while((r!=0)&&data[--r]>pivot); AXFQd@#
SortUtil.swap(data,l,r); .EpcMXT%
} C3>&O?7J*7
while(l SortUtil.swap(data,l,r); P+K< /i
return l; \W:~;GMeD
} K8,Q^!5]"
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} }M*yE]LL;Z
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改进后的快速排序: jJc:%h$|2
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package org.rut.util.algorithm.support; N/CL?Z>c
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import org.rut.util.algorithm.SortUtil; AYb-BaIc
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/** T8'm{[C
* @author treeroot &![3{G"+>l
* @since 2006-2-2 =cz^g^7
* @version 1.0 jjLx60|{
*/ p`N+9t&I4
public class ImprovedQuickSort implements SortUtil.Sort { t`%Xxxu
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private static int MAX_STACK_SIZE=4096; "=H(\V
private static int THRESHOLD=10; &p