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快速排序: C'=C^X%
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package org.rut.util.algorithm.support; O}KT>84M
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import org.rut.util.algorithm.SortUtil; W"2\vo)
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/** n&Al~-Q:^
* @author treeroot kKj YMYT6
* @since 2006-2-2 opIcSm&
* @version 1.0 pw$I~3OFd
*/ 'l;?P
public class QuickSort implements SortUtil.Sort{ |YlUt~H>
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/* (non-Javadoc) vfo[<"
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) rVN|OLh
*/ rSZWmns
public void sort(int[] data) { n@%'Nbc>b
quickSort(data,0,data.length-1); 8l}|.Q#--
} xApa+j6I
private void quickSort(int[] data,int i,int j){ ae^xuM?7
int pivotIndex=(i+j)/2; c{852R
//swap Y8AU<M
SortUtil.swap(data,pivotIndex,j); %V+,#
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int k=partition(data,i-1,j,data[j]); -(59F
SortUtil.swap(data,k,j); j"NqNv
if((k-i)>1) quickSort(data,i,k-1); fx}R7GN2
if((j-k)>1) quickSort(data,k+1,j); bqe;) A7
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/** zcNV<tx
* @param data (nc fR
* @param i T2Vj&EA@
* @param j )kd)v4#
* @return %r>vZ/>a
*/ @TH \hr]
private int partition(int[] data, int l, int r,int pivot) { M)LdGN?$
do{ MDB}G
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while(data[++l] while((r!=0)&&data[--r]>pivot); W5x]bl#
SortUtil.swap(data,l,r); UGN. ]#"#
} jAJkCCG
while(l SortUtil.swap(data,l,r); OE[/sv
return l; zO+nEsf^O
} Z os~1N]3
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改进后的快速排序: <e=0J8V8,i
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package org.rut.util.algorithm.support; vx
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import org.rut.util.algorithm.SortUtil; gVD!.
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/** fDRQ(}
* @author treeroot bk7miRIB
* @since 2006-2-2 2?"9NQvz
* @version 1.0 G?"1
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*/ h?R-t*G?
public class ImprovedQuickSort implements SortUtil.Sort { \fKv+
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private static int MAX_STACK_SIZE=4096; F0|T%!FB>%
private static int THRESHOLD=10; '2
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/* (non-Javadoc) c^=:]^
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) >?DrC /
*/ NKMB,b
public void sort(int[] data) { b"zq3$6*
int[] stack=new int[MAX_STACK_SIZE]; 9S<W~# zz
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int top=-1; %_z]iz4
int pivot; fkI<RgM
int pivotIndex,l,r; :,7VqCh3@
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stack[++top]=0; oFsMQ Py
stack[++top]=data.length-1; OI-%Ig%C#l
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while(top>0){ :._O.O
int j=stack[top--]; b&e?
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int i=stack[top--]; xA-G&oC]<T
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pivotIndex=(i+j)/2; ())|x[>JS+
pivot=data[pivotIndex]; oZ=e/\[K
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SortUtil.swap(data,pivotIndex,j); Lr+2L_/v`
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//partition @9L%`=]b^
l=i-1; WL7:22nSHa
r=j; Jne)?Gt
do{ [&39Yv.k,7
while(data[++l] while((r!=0)&&(data[--r]>pivot)); q3I,3?_
SortUtil.swap(data,l,r); sF|lhLi
} d82IEhZ#
while(l SortUtil.swap(data,l,r); nyDqR#t
SortUtil.swap(data,l,j); ~{N|("nB
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if((l-i)>THRESHOLD){ v` B_xEl
stack[++top]=i; +I/P5OGRN
stack[++top]=l-1; T@z$g
}
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