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快速排序: ]70ZerQ~L
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package org.rut.util.algorithm.support; ESFJN}Q%0.
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import org.rut.util.algorithm.SortUtil; .Tw:Y,G
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/** Ut/%+r"s
* @author treeroot .>}Z3jUrf
* @since 2006-2-2 8y[Rwa
* @version 1.0 #l9sQ-1Q
*/ ?y"M>#
public class QuickSort implements SortUtil.Sort{ `q | )_
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/* (non-Javadoc) 4OAR ["f
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Pv)^L
*/ 3-Xd9ou
public void sort(int[] data) { =jxy4`oF
quickSort(data,0,data.length-1); "|,KXv')
} R7h3O0@!
private void quickSort(int[] data,int i,int j){ /74h+.amg
int pivotIndex=(i+j)/2; VKlC`k8L
//swap ]vV)$xMX
SortUtil.swap(data,pivotIndex,j); Q$k#q<+0
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int k=partition(data,i-1,j,data[j]); 1TGE>HG
SortUtil.swap(data,k,j); w7q6v>
if((k-i)>1) quickSort(data,i,k-1); E1w8d4P,G
if((j-k)>1) quickSort(data,k+1,j); c7[Ba\Cr4h
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} tef>Py
/** +nB0O/m'U
* @param data RHbbj}B
* @param i ;v.J
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* @param j ]!jfrj
* @return {(tR<z)
*/ /9Qr1@&v
private int partition(int[] data, int l, int r,int pivot) { COBjJ3
do{ FGm!|iI
while(data[++l] while((r!=0)&&data[--r]>pivot); UV{})T*s
SortUtil.swap(data,l,r); YuJ{@"H
} }!|$;3t+c
while(l SortUtil.swap(data,l,r); E]a;Ydf~
return l; q]Xu #:X
} 6p3cMJ'8y
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} xh25 *y
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改进后的快速排序: 7A$mZPKh
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package org.rut.util.algorithm.support; F|oyrG
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import org.rut.util.algorithm.SortUtil; w?M"`O(
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/** 2FO<Z %Y
* @author treeroot (wxi!
* @since 2006-2-2 n!Y}D:6c6
* @version 1.0 xbHI4A"Z
*/ X%B$*y5
public class ImprovedQuickSort implements SortUtil.Sort { e5;YY
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private static int MAX_STACK_SIZE=4096; JP^x]t:
private static int THRESHOLD=10; #e@[{s7
/* (non-Javadoc) 5'w&M{{9
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) O CCC' k
*/ ^'+#BPo9@
public void sort(int[] data) { %@q2
int[] stack=new int[MAX_STACK_SIZE]; vkG%w;
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int top=-1; CC$rt2\e
int pivot; g]BA/Dw
int pivotIndex,l,r; ~xws5n}F
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stack[++top]=0; v5?ct?q
stack[++top]=data.length-1; P"@^BQ4
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while(top>0){ WqCj;Tj|
int j=stack[top--]; N_+D#Z.g
int i=stack[top--]; CEzdH!nP
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pivotIndex=(i+j)/2; Q+_z*
pivot=data[pivotIndex]; !u4eI0?R?
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SortUtil.swap(data,pivotIndex,j); ?hURNlR_Q
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//partition G"Ey%Q2K
l=i-1; ]xJ.OUJy
r=j; /,$V/q+
do{ %* gg6Q
while(data[++l] while((r!=0)&&(data[--r]>pivot)); |'x"+x
SortUtil.swap(data,l,r); muFWFq&yP
} iHQ$L# 7
while(l SortUtil.swap(data,l,r); ol
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SortUtil.swap(data,l,j); k!6m'}v
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if((l-i)>THRESHOLD){ H_1&>@ 3
stack[++top]=i; &Rz