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快速排序: M9[Fx=
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package org.rut.util.algorithm.support; D}r,t_]Eb
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import org.rut.util.algorithm.SortUtil; lrPiaSO`I
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/** 0jF~cV
* @author treeroot ,nD:W
* @since 2006-2-2 pZ}4'GnZI
* @version 1.0 Uo#%f+t
*/ t-)C0<
public class QuickSort implements SortUtil.Sort{ 1D sgU6"
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/* (non-Javadoc) s+8
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) S~.:B2=5K
*/ %qfql
public void sort(int[] data) { sk.<|-(o
quickSort(data,0,data.length-1); Py3Xvudv
} ,W;\6"Iwx'
private void quickSort(int[] data,int i,int j){ ]L@VpHEj
int pivotIndex=(i+j)/2; 5zWxI]4d\
//swap uW3`gwwlU
SortUtil.swap(data,pivotIndex,j); C0|<+3uND=
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int k=partition(data,i-1,j,data[j]); 7@NAky(
SortUtil.swap(data,k,j); {7LO|E}7
if((k-i)>1) quickSort(data,i,k-1); "T|%F D&[
if((j-k)>1) quickSort(data,k+1,j); *4"s,1?@BG
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} ? >SC:{(
/** 2 |
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* @param data D<B/oSy
* @param i /ldE (!^n
* @param j g.ty#Z=:
* @return #Cks&[!c
*/ <2Lcy&w_M
private int partition(int[] data, int l, int r,int pivot) { #05#@v8.f
do{ O:cta/M
while(data[++l] while((r!=0)&&data[--r]>pivot); 5}@6euT5$
SortUtil.swap(data,l,r); !*_5 B'
} Fsv:SL+5
while(l SortUtil.swap(data,l,r); }>Gnpc
return l; AQ:cim`
} u4*7n-(
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} t2d_XQOK
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改进后的快速排序: o_>id^$>B
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package org.rut.util.algorithm.support; O *^=
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import org.rut.util.algorithm.SortUtil; I%.KFPV
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/** E#?*6/
* @author treeroot ICwhqH&
* @since 2006-2-2 G?e"A0,
* @version 1.0 9N5ptdP.d
*/ SA@MJ>Z
public class ImprovedQuickSort implements SortUtil.Sort { Ej\EuX
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private static int MAX_STACK_SIZE=4096; %"Tn=fZIF
private static int THRESHOLD=10; D.elE:
/* (non-Javadoc) wmbjL=f
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) VU6nu4
*/ \-3\lZ3qj
public void sort(int[] data) { [!9dA.tF
int[] stack=new int[MAX_STACK_SIZE]; mGR}hsQpn
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int top=-1; Ln/6]CMl
int pivot; DtkY;Yl
int pivotIndex,l,r; ;O` \rP5w
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stack[++top]=0; wT/TQEgz
stack[++top]=data.length-1; <%WN<T{q|
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while(top>0){
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int j=stack[top--]; vowU+Y
int i=stack[top--]; |Y#KMi ~
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pivotIndex=(i+j)/2; g}HB|$P7
pivot=data[pivotIndex]; LDDeZY"xd
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SortUtil.swap(data,pivotIndex,j); +c&n7
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//partition *=UxX ]0y
l=i-1; ).aQ}Gwx^
r=j; TS0x8,'$q
do{ D4
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while(data[++l] while((r!=0)&&(data[--r]>pivot)); R Fgy
SortUtil.swap(data,l,r); WmU5YZ(mAq
} UUb n7&
while(l SortUtil.swap(data,l,r); K"~Tk`[0Q
SortUtil.swap(data,l,j); Da_8Q(XFe
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if((l-i)>THRESHOLD){ 3I!xa*u
stack[++top]=i; ke.{wh\0
stack[++top]=l-1; 4.]xK2sW
} ::13$g=T9s
if((j-l)>THRESHOLD){ HU[a b
stack[++top]=l+1; Gok8:,
stack[++top]=j; !e~Yp0gX#
} }6/L5j:+
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} [NQ\(VQ1c
//new InsertSort().sort(data); yn&AMq
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insertSort(data); (_&W@:"z
} 8`bQ,E+2
/** Nda,G++5(
* @param data Fua:& 77
*/ 3L2@C%
private void insertSort(int[] data) { R Wa4O#
int temp; ogN/zIU+VA
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); *69yB
} gH87e
} mKWfRx*UdG
} ,:yv T6)p
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} 1rhsmcE
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