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快速排序: dV?5Q_}
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package org.rut.util.algorithm.support; LwuF0\
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import org.rut.util.algorithm.SortUtil; '<iK*[NW
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/** P%Ay3cR+E
* @author treeroot OndhLLz
* @since 2006-2-2 S>q>K"j^!
* @version 1.0 ]=73-ywn]
*/ JIO$=+p
public class QuickSort implements SortUtil.Sort{ 1x~U*vbhQ
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/* (non-Javadoc) .7ayQp
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 'rb'7=z5
*/ M!M!Ni
public void sort(int[] data) { [O
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quickSort(data,0,data.length-1); K 3GSOD>
} w(nHD*nm
private void quickSort(int[] data,int i,int j){ qIwV q!=
int pivotIndex=(i+j)/2; MVCl.o
//swap t j Vh^
SortUtil.swap(data,pivotIndex,j); T:asm1BC[
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int k=partition(data,i-1,j,data[j]); \
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SortUtil.swap(data,k,j); aaWJ*
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if((k-i)>1) quickSort(data,i,k-1); UFn8kBk
if((j-k)>1) quickSort(data,k+1,j); 3b[jwCt
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} 9O,,m~B
/** Lb=W;9;
* @param data RBGlzk
* @param i -qV{WZ Hp
* @param j FdOFE.l
* @return TB
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*/ S(eQ{rSs
private int partition(int[] data, int l, int r,int pivot) { Ja^ 5?Ar|
do{ @nV5.r0W}B
while(data[++l] while((r!=0)&&data[--r]>pivot); T&"i _no*
SortUtil.swap(data,l,r); ;eB ~H[S/
} &[|VZ[
while(l SortUtil.swap(data,l,r); mjnUs-`W|
return l; HO|-@yOF^
} Y\/gU8w/
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} }ZZ5].-a<D
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改进后的快速排序: q$ghLGz
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package org.rut.util.algorithm.support; @fn6<3
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import org.rut.util.algorithm.SortUtil; j,%EW+j$
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/** Ln#a<Rx.E7
* @author treeroot ,i`h
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* @since 2006-2-2 _94s(~g:
* @version 1.0 IvBGpT"(I
*/ msTB'0
public class ImprovedQuickSort implements SortUtil.Sort { Vj^dD9:
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private static int MAX_STACK_SIZE=4096; @O3/3vi1
private static int THRESHOLD=10; )xl6,bq3
/* (non-Javadoc) f!GHEhQ9
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) F#q&(
*/ Db03Nk>#
public void sort(int[] data) { \ a-CN>
int[] stack=new int[MAX_STACK_SIZE]; Fq,N
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int top=-1; nf%4sIQ*x
int pivot; 7$T8&Mh
int pivotIndex,l,r; &&RA4
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stack[++top]=0; ~\_T5/I%
stack[++top]=data.length-1; 6517Km 4-
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while(top>0){ <4?*$
int j=stack[top--]; } ~enEZ
int i=stack[top--]; %JoxYy-
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pivotIndex=(i+j)/2; ,a(O`##Bn
pivot=data[pivotIndex]; jq oPLbxT
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SortUtil.swap(data,pivotIndex,j); N7.
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//partition /#q")4Mf
l=i-1; f~gSJ<t4
r=j; w6,*9(;$Pk
do{ #3.)H9
while(data[++l] while((r!=0)&&(data[--r]>pivot)); *%- ?54B
SortUtil.swap(data,l,r); -Ds|qzrN%
} 1i?=JAFfM
while(l SortUtil.swap(data,l,r); 1Kc^m\
SortUtil.swap(data,l,j); 7!d$M{0"
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if((l-i)>THRESHOLD){ W%8+t)
stack[++top]=i; kV^?p
stack[++top]=l-1; L{PH0Jf
} hLA;Bl
if((j-l)>THRESHOLD){ GgdlVi 2
stack[++top]=l+1; APHPN:v
stack[++top]=j; h(:<(o@<
} =P_fv
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} G1_Nd2w
//new InsertSort().sort(data); I6w/0,azC
insertSort(data); Qb@eK$wo}
} K\sbt7~
/** fA
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* @param data {[3YJkrM
*/ Dc:DY:L^
private void insertSort(int[] data) { 5EhE`k4
int temp; iSd?N}2,I
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); m`9^.>]P
} xii$e
} 0eA5zFU7
} b>=7B6 Aw
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} ZlM_m
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