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快速排序: qTyU1RU$9^
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package org.rut.util.algorithm.support; qr=U=oK
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import org.rut.util.algorithm.SortUtil; Z/uRz]Hi
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/** 7!JoP?!
* @author treeroot h2aJa@;S
* @since 2006-2-2 jO:<"l^+u
* @version 1.0 }+ #ag:M
*/ qm]ljut
public class QuickSort implements SortUtil.Sort{ #>ci!4Gz=Z
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/* (non-Javadoc) ? *I9
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) W.:kE|a.g
*/ hY'"^?OP
public void sort(int[] data) { dt3Vy*zL
quickSort(data,0,data.length-1); 9i|6
} .#WF'
private void quickSort(int[] data,int i,int j){ '}4[m>/
int pivotIndex=(i+j)/2; W {dx\+
//swap NnHM$hEI"U
SortUtil.swap(data,pivotIndex,j); 7@tr^JykO
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int k=partition(data,i-1,j,data[j]); ~P6K)V|@<
SortUtil.swap(data,k,j); L1C'V/g
if((k-i)>1) quickSort(data,i,k-1); [TO:-8$.
if((j-k)>1) quickSort(data,k+1,j); ocgbBE
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} Z/x<U.B
/** JG}U,{7(
* @param data xI:;%5{LN
* @param i <JH0 &
* @param j "l +Jx|h\
* @return A7b7IM [
*/ )cs
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private int partition(int[] data, int l, int r,int pivot) { QTn-n)AE
do{ ~Nc]`95
while(data[++l] while((r!=0)&&data[--r]>pivot); "hlIGJ?_=
SortUtil.swap(data,l,r); oHi&Z$#!n
} `(o1&
while(l SortUtil.swap(data,l,r); B4|%E$1+
return l; &
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} s:]rL&|
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} V">Uh@[J_
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改进后的快速排序: bh7 1Zu
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package org.rut.util.algorithm.support; w@%W{aUC
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import org.rut.util.algorithm.SortUtil; @Qc['V)
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/** /
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* @author treeroot
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* @since 2006-2-2 *iC
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* @version 1.0 B-&J]H
*/ [?IERE!xQ
public class ImprovedQuickSort implements SortUtil.Sort { dNJK[1e6
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private static int MAX_STACK_SIZE=4096; nW drVT$
private static int THRESHOLD=10; \GvVs
/* (non-Javadoc) BgpJ;D+N4
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) g:o\ r
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*/ nev*TYY?A
public void sort(int[] data) { }lxvXVc{I
int[] stack=new int[MAX_STACK_SIZE]; @$nI\n?*
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int top=-1; v"F0$c
int pivot; {YGz=5 ^
int pivotIndex,l,r; ?Y hua9
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stack[++top]=0; /d{L]*v)]
stack[++top]=data.length-1; +qz)KtJS
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while(top>0){ ~hxB Pn."
int j=stack[top--]; q]r!5&Z