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快速排序: pX6T7
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package org.rut.util.algorithm.support; ;knSn$
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import org.rut.util.algorithm.SortUtil; [rTV)JsTb
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/** ~J)4 (411
* @author treeroot GY,@jp|R
* @since 2006-2-2 0VoC|,$U
* @version 1.0 F"hi2@/TI
*/ [KWF7GQi
public class QuickSort implements SortUtil.Sort{ mfG|K@ODM-
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/* (non-Javadoc) wX#\\Jgi
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) U,iTURd
*/ #`z!f0
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public void sort(int[] data) { oLruYSaD
quickSort(data,0,data.length-1); }y|%wym
} Uvf-h4^J]:
private void quickSort(int[] data,int i,int j){ /qI80KVnN
int pivotIndex=(i+j)/2; p: sn>Y
//swap ;oh88,*'
SortUtil.swap(data,pivotIndex,j); Q
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int k=partition(data,i-1,j,data[j]); i+(`"8W
SortUtil.swap(data,k,j); rorzxp{
if((k-i)>1) quickSort(data,i,k-1); HH^{,53%
if((j-k)>1) quickSort(data,k+1,j); _?kf9 .
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} Zu%_kpW
/** 2_r}4)z
* @param data _I{&5V~z
* @param i b%$S6.
* @param j 4
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* @return >z^T~@m7l
*/ H _3gVrP_
private int partition(int[] data, int l, int r,int pivot) { !}1n?~]`
do{ 2"<}9A<Xs
while(data[++l] while((r!=0)&&data[--r]>pivot); Z|8f7@k{|+
SortUtil.swap(data,l,r); W\} VZY
} ]qV J>
while(l SortUtil.swap(data,l,r); ,z%F="@b9
return l; Crpkq/ M
} ::TUSz2/2
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改进后的快速排序: ~d{E>J77j
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package org.rut.util.algorithm.support; iZSjT"l^
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import org.rut.util.algorithm.SortUtil; 6h+/C]4
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/** Iu1P}R>C
* @author treeroot 9s*Lzi[}
* @since 2006-2-2 E\V>3rse
* @version 1.0 ni%^w(J3Q
*/ ;"Ot\:0
public class ImprovedQuickSort implements SortUtil.Sort { @
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private static int MAX_STACK_SIZE=4096; ?erDP8
private static int THRESHOLD=10; ~Dy0HVE
/* (non-Javadoc) w-\fCp )
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) nosEo?{
*/ m};_\Db`
public void sort(int[] data) { -w@fd]g
int[] stack=new int[MAX_STACK_SIZE]; PA5g]Tz
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int top=-1; "{V,(w8Dt
int pivot; [dzb{M6_
int pivotIndex,l,r; jNIM1_JjD
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stack[++top]=0; ~NTpMF
stack[++top]=data.length-1; aD&10b9`
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while(top>0){ vG\Wr.h0!=
int j=stack[top--]; gdT^QM:y4$
int i=stack[top--]; x_@ev-
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pivotIndex=(i+j)/2; a,j!B
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pivot=data[pivotIndex]; [ B (lJz
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SortUtil.swap(data,pivotIndex,j); kb%W3c9HO
Q z/pz_}
//partition 8F[j}.8q
l=i-1; VX>_Sps
r=j; yRgo1o w]
do{ 2l!"OiB.P
while(data[++l] while((r!=0)&&(data[--r]>pivot)); *|=&MU*+
SortUtil.swap(data,l,r); r?[mn^Bo 5
} tICxAp:
while(l SortUtil.swap(data,l,r); 6u.b?_u
SortUtil.swap(data,l,j); d3{Zhn@
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if((l-i)>THRESHOLD){ Eui;2P~
stack[++top]=i; 71A{"
stack[++top]=l-1; \7C >4
} ?%LD1 <ya
if((j-l)>THRESHOLD){ #qn)Nq(
stack[++top]=l+1; lo(Ht=d
stack[++top]=j; Fza)dJ7
} FF_$)%YUp
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} i#-Jl7V[a
//new InsertSort().sort(data); cX=` Tl
insertSort(data); vEgJmHv;
} 7}lZa~/
/** NMj`wQ`M+
* @param data HOUyB's'
*/ /f6]XP\'`+
private void insertSort(int[] data) { >WD^)W fa
int temp; I{Kc{MXn
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); z)]EB6uRg
} TY#1Z )%
} N%_~cR;
} Y7jD:P
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} txgGL'
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