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快速排序: 2n<Mu Q]
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package org.rut.util.algorithm.support; G4*
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import org.rut.util.algorithm.SortUtil; a-{|/
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/** {VcRur}&Y8
* @author treeroot =zkN63S
* @since 2006-2-2 -DI
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* @version 1.0 GX>8B:]o|
*/ m5K?oV@n
public class QuickSort implements SortUtil.Sort{ 9&lemz
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/* (non-Javadoc) f3K-X1`]'U
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 7(Fas(j3
*/ L&p R#
public void sort(int[] data) { %'Cj~An
quickSort(data,0,data.length-1); &
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} )bUnk+_
private void quickSort(int[] data,int i,int j){ bMO^}qR`
int pivotIndex=(i+j)/2; }Fe6L;^;
//swap eZ'8JU]
SortUtil.swap(data,pivotIndex,j); -xn-Af!v
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int k=partition(data,i-1,j,data[j]); Fs/CW\
SortUtil.swap(data,k,j); ? i{?Q,
if((k-i)>1) quickSort(data,i,k-1); lw@Yn>eza
if((j-k)>1) quickSort(data,k+1,j); ,PeR}E;c
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} :""HyjY!
/** Y2`sL,'h
* @param data htBA.eQ
* @param i 7^eyO&4z
* @param j P5Xp #pa
* @return j~q 7v
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*/ [\8rh^LFi
private int partition(int[] data, int l, int r,int pivot) { :?M_U;;z2+
do{ `<7\Zl
while(data[++l] while((r!=0)&&data[--r]>pivot); btW#ebm
SortUtil.swap(data,l,r); p6DI7<C<H
} ~+Wx\:TT
while(l SortUtil.swap(data,l,r); ;K<VT\
return l; K=gg <E<
} "N+4TfXy
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} Zbczbnj
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改进后的快速排序: 5CI{&E
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package org.rut.util.algorithm.support; }-3 VK%
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import org.rut.util.algorithm.SortUtil; #Vk?
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/** *AH`ob}
* @author treeroot 4|x_C-@
* @since 2006-2-2 t&?jJ7 (&8
* @version 1.0 "f91YX_)
*/ 2S8;=x}/
public class ImprovedQuickSort implements SortUtil.Sort { <cTX;&0=
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private static int MAX_STACK_SIZE=4096; d{fd5jv;
private static int THRESHOLD=10; lR?y
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/* (non-Javadoc) !tq]kKJ3:
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) &y?
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*/ :8yebOs
public void sort(int[] data) { IdmP!(u
int[] stack=new int[MAX_STACK_SIZE]; 9\8ektq}Z
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int top=-1; `l|Oj$
int pivot; oCT,v 0+4O
int pivotIndex,l,r; e$9a9twl
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stack[++top]=0; |f_'(-v`E
stack[++top]=data.length-1; c.>f,vtcn
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while(top>0){ K|%Am4
int j=stack[top--]; ^G!cv
int i=stack[top--]; mV}bQ^*?Z
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pivotIndex=(i+j)/2; ^Mq/Cf_T
pivot=data[pivotIndex]; gC$_yd6m
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SortUtil.swap(data,pivotIndex,j); 3@~a)E}T
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//partition bF _]j/
l=i-1; ^Gk)aX
r=j; &eMd^l}:#
do{ tl dK@!E3
while(data[++l] while((r!=0)&&(data[--r]>pivot)); aE0R{yup Z
SortUtil.swap(data,l,r); m*
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} ?d Jd7+A
while(l SortUtil.swap(data,l,r); Kw-<