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快速排序: c1StA
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package org.rut.util.algorithm.support; 62#8c~dL
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import org.rut.util.algorithm.SortUtil; k?=_p6>
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/** 'deqF|Iox
* @author treeroot zuvP\Y=V`
* @since 2006-2-2 PSa"u5 O
* @version 1.0 U66oe3W
*/ K|.!)L
public class QuickSort implements SortUtil.Sort{ .,SWa;[iB
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/* (non-Javadoc) dH0wVI<z
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) n:YA4t7S
*/ DJHE6XJ
public void sort(int[] data) {
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quickSort(data,0,data.length-1); H$]FUv8
} sB`zk[R;
private void quickSort(int[] data,int i,int j){ fhe%5#3
int pivotIndex=(i+j)/2; 2graLJ?9Z
//swap 9_pOV%Qs
SortUtil.swap(data,pivotIndex,j); P87qUC
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int k=partition(data,i-1,j,data[j]); V$ac}A,!
SortUtil.swap(data,k,j); |HK/*B
if((k-i)>1) quickSort(data,i,k-1); l
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if((j-k)>1) quickSort(data,k+1,j); %:[Y/K-
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} n\H.NL)
/** 6-uB[$ko
* @param data F%
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* @param i gnU##Km|
* @param j +4k7ti1Qb
* @return
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*/ ,?s:s&4
private int partition(int[] data, int l, int r,int pivot) { >"+bL6#
do{ <US!XMrCg
while(data[++l] while((r!=0)&&data[--r]>pivot); %R1$M318
SortUtil.swap(data,l,r); -j"2rIl4#
} 5}2XnM2
while(l SortUtil.swap(data,l,r); aD8r:S\
return l; x)o`w"]al
} ,]-A~ ^|
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改进后的快速排序: nD;8)VI'I
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package org.rut.util.algorithm.support; \}mn"y
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import org.rut.util.algorithm.SortUtil; p*(]8pDC
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/** Fs)m;C
* @author treeroot .=4k'99,
* @since 2006-2-2 v"G) G)*z
* @version 1.0 d/`Q,Vl
*/ NI?YUhg>
public class ImprovedQuickSort implements SortUtil.Sort { p=8?hI/bim
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private static int MAX_STACK_SIZE=4096; 4
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private static int THRESHOLD=10; }z8HS<
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/* (non-Javadoc) `=cOTn52
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) m;KD@E!
*/ 8?&u5
public void sort(int[] data) { .m\' |%
int[] stack=new int[MAX_STACK_SIZE]; ^{Y9!R*9U*
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int top=-1; >R}p*=J
int pivot; 9q!./)
int pivotIndex,l,r; xBi``x2eY
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stack[++top]=0; yjxv D
stack[++top]=data.length-1; 96
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while(top>0){ itW~2#nJz
int j=stack[top--]; " )_-L8
int i=stack[top--]; [boB4>.
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pivotIndex=(i+j)/2; ThSB\
pivot=data[pivotIndex]; YE\s<$
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SortUtil.swap(data,pivotIndex,j); IQ"9#{o
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