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快速排序: M il
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package org.rut.util.algorithm.support; ,b!!h]t
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import org.rut.util.algorithm.SortUtil; +^1E0@b%
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/** 7DaMuh~<
* @author treeroot tr3Rn :0]
* @since 2006-2-2 +rse,b&U(
* @version 1.0 (GB2("p`
*/ h&d%#6mB
public class QuickSort implements SortUtil.Sort{ GjlA\R^e
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/* (non-Javadoc) }? j>V
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) aN9#ATE
*/ )f(.{M
public void sort(int[] data) { wG6@.;3
quickSort(data,0,data.length-1); 3";Rw9
} DrE
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private void quickSort(int[] data,int i,int j){ 2K?~)q&t*
int pivotIndex=(i+j)/2; m:|jv|f
//swap Esh3cn4
SortUtil.swap(data,pivotIndex,j); NMq#D$T
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int k=partition(data,i-1,j,data[j]); t}r`~AEa!
SortUtil.swap(data,k,j); &E|2-)
if((k-i)>1) quickSort(data,i,k-1); H>Wi(L7
if((j-k)>1) quickSort(data,k+1,j); #Ezq}F8Y
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} _cra_(b
/** cm^:3(yYX
* @param data ZNb;24
* @param i <-KHy`u
* @param j ,'[&" Eg
* @return Sj?u^L8es}
*/ `tZu~
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private int partition(int[] data, int l, int r,int pivot) { za{z2#aJ
do{ Us4J[MW<
while(data[++l] while((r!=0)&&data[--r]>pivot); 34S|[PXd
SortUtil.swap(data,l,r); V
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} Ckd=tvL
while(l SortUtil.swap(data,l,r); wcGI2aflD
return l; #D8Z~U,-
} h_Ky2IB$
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} 3k)W0]:|<
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改进后的快速排序: v^;-w~?3
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package org.rut.util.algorithm.support; _-/aMfyQ
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import org.rut.util.algorithm.SortUtil; C'8v\C9Ag
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/** eZDqW)x
* @author treeroot ="E^9!
* @since 2006-2-2 3I!xa*u
* @version 1.0 cI}qMc
*/ O^fg~g X
public class ImprovedQuickSort implements SortUtil.Sort { 4.]xK2sW
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private static int MAX_STACK_SIZE=4096; m\a_0!K
private static int THRESHOLD=10; R?aE:\A
/* (non-Javadoc) \~V
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 9=,^^,q
*/ !e~Yp0gX#
public void sort(int[] data) { q-c9YOz_
int[] stack=new int[MAX_STACK_SIZE]; Z9cg,#(D
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int top=-1; /Mk85C79
int pivot; @**@W[EM
int pivotIndex,l,r; a& >(*PQ
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stack[++top]=0; >~O36q^w
stack[++top]=data.length-1; Cj~45)r
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while(top>0){ Q`$Q(/
int j=stack[top--]; LW?Zd=
int i=stack[top--]; LxqK@Q<B
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pivotIndex=(i+j)/2; DG_tmDT4
pivot=data[pivotIndex]; ~ou1{NS
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SortUtil.swap(data,pivotIndex,j); w k1O*_76
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//partition JTT"t@__
l=i-1; C;m 7~R
r=j; mKWfRx*UdG
do{ U?/UW;k[
while(data[++l] while((r!=0)&&(data[--r]>pivot)); +r EqE/QF
SortUtil.swap(data,l,r); -[-LR }u
} |Ad1/>8i
while(l SortUtil.swap(data,l,r); piIr.]
SortUtil.swap(data,l,j); c&zZsJ"~
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if((l-i)>THRESHOLD){ `c
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stack[++top]=i; 8o' a
stack[++top]=l-1; KP)BD;
} iUuG}rqj
if((j-l)>THRESHOLD){ RB]K?
stack[++top]=l+1; F\m
stack[++top]=j; -ya0!D
} $`q8-+{
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} iG<rB-"
//new InsertSort().sort(data); d~L`*"/)[
insertSort(data); q/w U7P\%
} ucm3'j
/** V\axOz!
* @param data wk {9
*/ q|PB[*T
private void insertSort(int[] data) { QusEWq)}<
int temp; StUiL>9T#
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); w)bLdQ
} X|.M9zIx
} X1* 6qd+E
} qwAN=3@
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} F?j;3@z[A
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