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快速排序: _8,()t'"
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package org.rut.util.algorithm.support; TaE~s
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import org.rut.util.algorithm.SortUtil; ZJPmR/OV_
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/** $5x ,6[&
* @author treeroot br-]fE.be
* @since 2006-2-2 u .f= te
* @version 1.0 0k)rc$eDF+
*/ )R`x R,H
public class QuickSort implements SortUtil.Sort{ ,R%q}IH#
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/* (non-Javadoc) $odso;Hn
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) @+3kb.P%7
*/ Gmwf4>"
public void sort(int[] data) { ;X*cCb`h
quickSort(data,0,data.length-1); wO?{?+I`q
} #(An6itl
private void quickSort(int[] data,int i,int j){ >leU:7
int pivotIndex=(i+j)/2; [
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//swap 'AN>`\mR$
SortUtil.swap(data,pivotIndex,j); 1-lu\"H`
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int k=partition(data,i-1,j,data[j]); ,]bB9tid
SortUtil.swap(data,k,j); AbZKYF
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if((k-i)>1) quickSort(data,i,k-1); $Y69@s %f
if((j-k)>1) quickSort(data,k+1,j); 4R18A=X
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} |{CfWSB7~@
/** Z&;uh_EC
* @param data `BlI@6th
* @param i !pD*p)`s
* @param j ,l<6GB2\
* @return ty8v
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*/ j~!X;PV3
private int partition(int[] data, int l, int r,int pivot) { z^T`x_mF
do{ H1}
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while(data[++l] while((r!=0)&&data[--r]>pivot); : |>Gc39`t
SortUtil.swap(data,l,r); z11O F
} ?Y@N`S
while(l SortUtil.swap(data,l,r); 6I%5Q4Ll
return l; l<A|d{" ]
} uD^cxD
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} V#iPj'*
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改进后的快速排序: k |eBJ%
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package org.rut.util.algorithm.support; `\}v#2VJ
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import org.rut.util.algorithm.SortUtil; zx)z/1
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/** E"5*Ei)^3
* @author treeroot y !_C/!d
* @since 2006-2-2 tNbN7yI
* @version 1.0 |aVn&qK
*/ ]x(!&y:h
public class ImprovedQuickSort implements SortUtil.Sort { i%0ur}p
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private static int MAX_STACK_SIZE=4096; >s<^M|S07
private static int THRESHOLD=10; lE4HM$p
/* (non-Javadoc) y~U #veY
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
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*/ H"
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public void sort(int[] data) { ~v|>xqWV
int[] stack=new int[MAX_STACK_SIZE]; #Up86(Z
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int top=-1; rE.;g^4p
int pivot; dtRwTUMe?
int pivotIndex,l,r; ,)Znb=
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stack[++top]=0; rrik,qyv6
stack[++top]=data.length-1; l)1r+@)\
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while(top>0){ a%/9v"}
int j=stack[top--]; 8
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int i=stack[top--]; w"-Lc4t+
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pivotIndex=(i+j)/2; s %j_H
pivot=data[pivotIndex]; +M\`#i\g>
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SortUtil.swap(data,pivotIndex,j); (X\@t-8
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//partition @tNz Q8
l=i-1; )rn*iJ.e8
r=j; YNKHN2E8
do{ W$hx,VEy`
while(data[++l] while((r!=0)&&(data[--r]>pivot)); D9^h;
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SortUtil.swap(data,l,r); 96( v
} )rxX+k+b/
while(l SortUtil.swap(data,l,r); x[~b2o
SortUtil.swap(data,l,j); S9]'?|
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if((l-i)>THRESHOLD){ . qO@Q =
stack[++top]=i; Z'`<5A%;
stack[++top]=l-1; y" RF;KW>
} vdivq^%=a
if((j-l)>THRESHOLD){ x<tb
stack[++top]=l+1; ;=)k<6
stack[++top]=j; =_JjmTy;a
} <J<{l
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} 9-&Ttbb4)0
//new InsertSort().sort(data); bh,[ 3X%
insertSort(data); !;q&NHco
}
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/** nv*FT
* @param data DR5\45v
*/ eI$oLl@
private void insertSort(int[] data) { Yb|c\[ %
int temp; oK6tTK
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); ?pW`cFLDHF
} ,1~"eGl!
} rK' L6o
} ,>bh$|
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} ysQ_[
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