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快速排序: T/NeoU3 p
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package org.rut.util.algorithm.support; CR$\$-
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import org.rut.util.algorithm.SortUtil; X) lz BM
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/** 6 /8?:
* @author treeroot E?>
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* @since 2006-2-2 P qFK*^)s
* @version 1.0 }:UNL^e?
*/ #QdBI{2
public class QuickSort implements SortUtil.Sort{ @y,pfWh`
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/* (non-Javadoc) 5c?1JH62o8
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) O)g\/uRy
*/ >3R)&N
public void sort(int[] data) { , VT&
quickSort(data,0,data.length-1); h$`P|#V&
} -nP
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private void quickSort(int[] data,int i,int j){ AS[yNCsjC
int pivotIndex=(i+j)/2; p<#WueR[
//swap 5 rpX"(
SortUtil.swap(data,pivotIndex,j); feOX]g#
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int k=partition(data,i-1,j,data[j]); w0n.Y-v4i
SortUtil.swap(data,k,j); b,]QfC
if((k-i)>1) quickSort(data,i,k-1); 2y/|/IW=
if((j-k)>1) quickSort(data,k+1,j); 29R_?HBH
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} 92|\`\LP%
/** m22FOjk\
* @param data FsI51@V72Q
* @param i QkJAjmB
* @param j I^h^QeBis
* @return $@t]0
*/ d>j`|(\
private int partition(int[] data, int l, int r,int pivot) { :q_(=EA
do{ eH.~c3o
while(data[++l] while((r!=0)&&data[--r]>pivot); K&2{k+w
SortUtil.swap(data,l,r); 4\qnCf3
} *c<=IcA
while(l SortUtil.swap(data,l,r); .!yXto:
return l; [=dK%7v
} H+UA
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} }GV5':W@WG
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改进后的快速排序: iYwzdW1
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package org.rut.util.algorithm.support; Fk01j;k.H
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import org.rut.util.algorithm.SortUtil; AN-qcp6=o
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/** G.CkceWRn
* @author treeroot ] B
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* @since 2006-2-2 pY75S5h:
* @version 1.0 {9>LF
*/ n#F:(MSOp
public class ImprovedQuickSort implements SortUtil.Sort { E0 ~\ A;
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private static int MAX_STACK_SIZE=4096; kzq3-NTV
private static int THRESHOLD=10; mUFg(;ya
/* (non-Javadoc) J9+<9g4-t
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 7f!"vhCXM;
*/ HV_5
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public void sort(int[] data) { QahM)Gb
int[] stack=new int[MAX_STACK_SIZE]; ''Lf6S`4X~
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int top=-1; AUZ^XiK
int pivot; 0$8iWL
int pivotIndex,l,r; Mi+<|5is
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stack[++top]=0; ;- ~}g 7$
stack[++top]=data.length-1; Fp3NWvu
(-'Jf#&X^
while(top>0){ C!a#M{:
int j=stack[top--]; -+9,RtHR7
int i=stack[top--]; tWD5Yh>.?$
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pivotIndex=(i+j)/2; {<f |h)r
pivot=data[pivotIndex]; Yz6+
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SortUtil.swap(data,pivotIndex,j); [nL{n bli
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//partition QfHJZ7K.4
l=i-1; >x/;'Y.
r=j; IdP"]Sv{<
do{ F^La\cZ*'
while(data[++l] while((r!=0)&&(data[--r]>pivot)); fpESuVKr
SortUtil.swap(data,l,r); 'Ipp1a
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} UBj"m<
while(l SortUtil.swap(data,l,r); ^5{M@o
SortUtil.swap(data,l,j); t@hE}R
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if((l-i)>THRESHOLD){ ?H7Ym N
stack[++top]=i; G)|s(C!
stack[++top]=l-1; ?<