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快速排序: Mm[1Z;H
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package org.rut.util.algorithm.support; U3iyuE
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import org.rut.util.algorithm.SortUtil; [g
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/** |k9j )Hg(
* @author treeroot $TW+LWb
* @since 2006-2-2 G&@RLht
* @version 1.0 vh{1u
*/ QMfy^t+I
public class QuickSort implements SortUtil.Sort{ *gMP_I
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/* (non-Javadoc) |^9ig_k`
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) !urd
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*/ WiCM,wDi
public void sort(int[] data) { 4Fc1'
quickSort(data,0,data.length-1); tf}Q%)`f
} :zy'hu;
private void quickSort(int[] data,int i,int j){ #3ro?w
int pivotIndex=(i+j)/2; vT<wd#
//swap U=1`. Ove
SortUtil.swap(data,pivotIndex,j); `U>b6{K
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int k=partition(data,i-1,j,data[j]); MvwJ(3
SortUtil.swap(data,k,j); K OHH74}_
if((k-i)>1) quickSort(data,i,k-1); s 17gi,"X
if((j-k)>1) quickSort(data,k+1,j); 1+ARV&bc
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} I6Q_A
/** 745V!#3!M
* @param data RloPP
* @param i c15^<6]g
* @param j ialk6i![
* @return V\8
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*/ %cif0Td
private int partition(int[] data, int l, int r,int pivot) { 'cc4Y~0s
do{ +}Wo=R}
while(data[++l] while((r!=0)&&data[--r]>pivot); yXQ;LQ;
SortUtil.swap(data,l,r); nU#q@p)Xg
} Qvg"5_26v
while(l SortUtil.swap(data,l,r); [5d][1=
return l; 5'[X&r%#
} u\;dUnr
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} &l*dYzqq
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改进后的快速排序: xE[tD? M{
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package org.rut.util.algorithm.support; $7
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import org.rut.util.algorithm.SortUtil; e-av@a3
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/** L2A#OZZu
* @author treeroot &H>dE]Hq,
* @since 2006-2-2 _NW OSt
* @version 1.0 cCCplL
*/ DLM9o3/*J
public class ImprovedQuickSort implements SortUtil.Sort { 'GoeVq
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private static int MAX_STACK_SIZE=4096; q%&7J<
private static int THRESHOLD=10; K:Go%3~,
/* (non-Javadoc) QQ8W;x
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ?pY!sG
*/ &;3z 1s/
public void sort(int[] data) { U2?gODh'
int[] stack=new int[MAX_STACK_SIZE]; -$ft `Ih
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int top=-1; G{Q'N04RA
int pivot; nU *fne?
int pivotIndex,l,r; o/
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stack[++top]=0; RN|..zml
stack[++top]=data.length-1; VMXXBa&
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while(top>0){ x)5v8kgf
int j=stack[top--]; 3]'z8i({7Y
int i=stack[top--]; m%\[1|N
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pivotIndex=(i+j)/2; <\mc|p"
pivot=data[pivotIndex]; _Q}z 6+_\
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SortUtil.swap(data,pivotIndex,j); }d]8fHG
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//partition KYW1<Wcp
l=i-1; Q~{@3<yEI
r=j; F'*&-l
do{ c!T{|'?
while(data[++l] while((r!=0)&&(data[--r]>pivot)); sn#h=,*4`
SortUtil.swap(data,l,r); Al]9/ML/m
} Q7%#3ML
while(l SortUtil.swap(data,l,r); 8hp]+k_y
SortUtil.swap(data,l,j); ]~ M
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if((l-i)>THRESHOLD){ Bb`^,?m
stack[++top]=i; mjHY-lK
stack[++top]=l-1; A UV$ S2
} ^w\uOd`
if((j-l)>THRESHOLD){ A6L}5#7-
stack[++top]=l+1; UQ~rVUo.c
stack[++top]=j; =h;!# ZC
} t}gqk'
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} E9hWn0 e
//new InsertSort().sort(data); _O<{H '4NO
insertSort(data); xGA0]
_
} `pUArqf
/** o7seGw<$X
* @param data NBYE#Uih
*/ ^IYN"yX_
private void insertSort(int[] data) { w (-n1oSo
int temp; $)~]4n=
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); L]}|{<3\
} G9q0E|
} 8<
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} K gX)fj
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} q4N$.hpb
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