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快速排序: %xv*#.<Vj
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package org.rut.util.algorithm.support; B2,c_[UZ.
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import org.rut.util.algorithm.SortUtil; {ldt/dl~
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/** ^m/7TwD
* @author treeroot ^~;"$=Wf
* @since 2006-2-2 7|PB6h3
* @version 1.0 +^DDWVp
*/ Z0[d;m*
public class QuickSort implements SortUtil.Sort{ ;Rljx3!N
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/* (non-Javadoc) o/6VOX
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ri%j*Kn
*/ k2O3{xIjc
public void sort(int[] data) { 4l`[,BJ
quickSort(data,0,data.length-1); =/!RQQ|8o
} aH?+^f"D
private void quickSort(int[] data,int i,int j){ >r3SF3XMq
int pivotIndex=(i+j)/2; rS!M0Hq>t
//swap a*&(cn
SortUtil.swap(data,pivotIndex,j); TI|h
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int k=partition(data,i-1,j,data[j]); v`@NwH<r
SortUtil.swap(data,k,j); /Nkxb&
if((k-i)>1) quickSort(data,i,k-1); .b?Aq^i8
if((j-k)>1) quickSort(data,k+1,j); 5P{[8PZxbV
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} ,M9e *
/** bq2f?uD-}
* @param data FeZ*c~q
* @param i Za,myuI+
* @param j 3rY\y+m
* @return T&4f}g/
*/ j5wfqi
private int partition(int[] data, int l, int r,int pivot) { +s;>@j()V
do{ k<|}&<h
while(data[++l] while((r!=0)&&data[--r]>pivot); 9:*[Q"v
SortUtil.swap(data,l,r); 6>]w1
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} ;0U*N &
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while(l SortUtil.swap(data,l,r); %P7qA
return l; |\W53,n9
} r
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} guG&3{&\s
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改进后的快速排序: =I aWf
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package org.rut.util.algorithm.support; iu?gZVyka
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import org.rut.util.algorithm.SortUtil; sh R|
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/** }<YU4EW
* @author treeroot /,_m\JkwL
* @since 2006-2-2 :dqZM#$d
* @version 1.0 \Si p
*/ ?qb35
public class ImprovedQuickSort implements SortUtil.Sort { inFS99DKx
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private static int MAX_STACK_SIZE=4096; `^] D;RfE
private static int THRESHOLD=10; @C<ofg3E
/* (non-Javadoc) &)jq3
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) \1SC:gN*#
*/ i),bAU!+m
public void sort(int[] data) { ap8q`a{j^
int[] stack=new int[MAX_STACK_SIZE]; 4l7
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int top=-1; d@p#{ -
int pivot; ZS%W/.?
int pivotIndex,l,r; ;{aGEOP'U
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stack[++top]=0; Af\
stack[++top]=data.length-1; Vm[F~2+HX
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while(top>0){ Xo:Mar
int j=stack[top--]; 2e-`V5{)b
int i=stack[top--]; x0b=r!Duu
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pivotIndex=(i+j)/2; x5CMP%}d
pivot=data[pivotIndex]; ?%[~J
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SortUtil.swap(data,pivotIndex,j); peF)U
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//partition *`rfD*
l=i-1; uIbAlE
r=j; ZSs@9ej
do{ y%X!l(gQ
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 5|=J\Lp2I
SortUtil.swap(data,l,r); 9|lLce$
} #%2 d;V
while(l SortUtil.swap(data,l,r); yx|{:Li!
SortUtil.swap(data,l,j); qDG2rFu&[
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if((l-i)>THRESHOLD){ ggL/7I(
stack[++top]=i; + c+i u6+"
stack[++top]=l-1; P6O\\,B1A
} 6UqAs<c9
if((j-l)>THRESHOLD){ vJaWHC$q
stack[++top]=l+1; h=0a9vIXF
stack[++top]=j; i%JJ+9N
} 6Iqy"MQuq
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