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快速排序: )
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package org.rut.util.algorithm.support; YWF<2l.
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import org.rut.util.algorithm.SortUtil; M)Q+_c2*
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/** YHAg4eb8
* @author treeroot \
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* @since 2006-2-2 a,9GSKXo1
* @version 1.0 GdY^}TJrh
*/ nK=V`
public class QuickSort implements SortUtil.Sort{ `d#_66TLr
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/* (non-Javadoc) j` lK}
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) &p/k VM
*/ .1}(Bywm5
public void sort(int[] data) { JpiKZG@L
quickSort(data,0,data.length-1); 3W0:0I
} bc-}Qn
private void quickSort(int[] data,int i,int j){ 9Ua@-
int pivotIndex=(i+j)/2; zf#&3K 'k
//swap 8=uljn/
SortUtil.swap(data,pivotIndex,j); Mq$=zsj
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int k=partition(data,i-1,j,data[j]); Xw5"JE!.
SortUtil.swap(data,k,j); 0l*/_;wo
if((k-i)>1) quickSort(data,i,k-1); GjBQxn
if((j-k)>1) quickSort(data,k+1,j); U"Oq85vY
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} &Y$rVBgQ
/** dGjvSK<1@
* @param data
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* @param i ;'}xD5]
* @param j )=@ XF0
* @return ln7.>.F
*/ &5<lQ1
private int partition(int[] data, int l, int r,int pivot) { hRu%> =7
do{ +0DIN4Y(4
while(data[++l] while((r!=0)&&data[--r]>pivot); 50A_+f.7%
SortUtil.swap(data,l,r); uv!/DX#
} ^xrR3m*d
while(l SortUtil.swap(data,l,r); M#m7g4*L !
return l; g&V.o5jIhc
} G$b4`wt
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} Xs/hqIXB
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改进后的快速排序: \8!HZei
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package org.rut.util.algorithm.support; kcb'`<B
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import org.rut.util.algorithm.SortUtil; [#tW$^UD
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/** "yumc5kt
* @author treeroot M}>q>
* @since 2006-2-2 jQhf)B
* @version 1.0 i y 5
*/ TH-^tw
public class ImprovedQuickSort implements SortUtil.Sort { jWz-7BO
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private static int MAX_STACK_SIZE=4096; Jz6PqU|=
private static int THRESHOLD=10; V4>P8cE
/* (non-Javadoc) x?kZD~|{)
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) }|d:(*
*/ h;6@-\6
public void sort(int[] data) { T7v8}_"-
int[] stack=new int[MAX_STACK_SIZE]; 8"@<s?0\"
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int top=-1; *QVE>{
int pivot; /D q]=P
int pivotIndex,l,r; DuWP)#kg
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stack[++top]=0; e0TnA
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stack[++top]=data.length-1; {2nXItso
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while(top>0){ ]kPco4
int j=stack[top--]; gDv]n^&