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快速排序: re\&'%~K
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package org.rut.util.algorithm.support; z>X<Di&x)
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import org.rut.util.algorithm.SortUtil; !Wz%Hy:ZK
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/** d' Z
* @author treeroot V/}g'_E
* @since 2006-2-2 4r'f/s8"#
* @version 1.0 qkN{l88
*/ 0WI3m2i
public class QuickSort implements SortUtil.Sort{ c>%+y+b{
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/* (non-Javadoc) EpCsJ08K
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) k-&fPEjG
*/ R4Vi*H
public void sort(int[] data) { ?tLBEoUmKT
quickSort(data,0,data.length-1); E/</
} 8QN#PaY
private void quickSort(int[] data,int i,int j){ ,f;YJHEx8
int pivotIndex=(i+j)/2; 5g3D}F>OJ
//swap Hki
SortUtil.swap(data,pivotIndex,j); gE>_:s
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int k=partition(data,i-1,j,data[j]); ^%V^\DK
SortUtil.swap(data,k,j); prx)Cfv
if((k-i)>1) quickSort(data,i,k-1); VnB"0"%w
if((j-k)>1) quickSort(data,k+1,j); M/X&zr
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} @3hA\3ot^
/** ;LM,<QJ
* @param data &cEQ6('H
* @param i jF}u%T)HL
* @param j A[F tPk{k
* @return VuqJ&U.-
*/ \/Z?QBFvz
private int partition(int[] data, int l, int r,int pivot) { 6 ZutU ~HS
do{ 4ACL|RF)A
while(data[++l] while((r!=0)&&data[--r]>pivot); 4]F:QS%
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SortUtil.swap(data,l,r); _{fh/{b1
} I$7#Z!P6|
while(l SortUtil.swap(data,l,r); ?n 9<PMo
return l; _%` )cOr
} H]7MN Y
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} 9 -\.|5;:
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改进后的快速排序: l
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package org.rut.util.algorithm.support; .]_
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import org.rut.util.algorithm.SortUtil; 9%i|_c}
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/** BM_hW8&G
* @author treeroot 0:Ow$
* @since 2006-2-2 a9h K8e
* @version 1.0 LZirw'
*/ :`~;~gW<
public class ImprovedQuickSort implements SortUtil.Sort { Sz.sX w;
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private static int MAX_STACK_SIZE=4096; s}NE[Tw
private static int THRESHOLD=10; 3dlL?+Y#
/* (non-Javadoc) 8CR b6
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ]m _<lRye
*/ sYQ=nL
public void sort(int[] data) { owz6j:
int[] stack=new int[MAX_STACK_SIZE]; $IZ02ZM$
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int top=-1; _O76Aw-@l
int pivot; ;<j[0~qp:
int pivotIndex,l,r; 3ZZ"mlk*
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stack[++top]=0; {tq.c9+!d
stack[++top]=data.length-1; ?C%mwW3pc
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while(top>0){ %r1NRg8
int j=stack[top--]; P4&3jQ[o
int i=stack[top--]; 381a(F[$e
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pivotIndex=(i+j)/2; T d E.e(
pivot=data[pivotIndex]; I
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SortUtil.swap(data,pivotIndex,j); N-
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//partition MLbmz\8a
l=i-1; `x{*P.]N!<
r=j; %rU8^'Gu
do{ (gdi2
while(data[++l] while((r!=0)&&(data[--r]>pivot)); _>b=f
SortUtil.swap(data,l,r); (KHO'QNMt^
} +v!%z(
while(l SortUtil.swap(data,l,r); eflmD$]SW
SortUtil.swap(data,l,j); O[$,e%
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if((l-i)>THRESHOLD){ 0j}!4D+
stack[++top]=i; ^Z
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stack[++top]=l-1; |`N|S
} /0.m|Th'm
if((j-l)>THRESHOLD){ A_:CGtv:
stack[++top]=l+1; 8h,>f#)0c
stack[++top]=j; ECZ`I Z.
} <D_UF1Pk
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} y'$Re
//new InsertSort().sort(data); bdS
insertSort(data); |Ok@:Au
} Xr B)[kQ
/** t<F*ODn
* @param data 8)Z)pCN
*/ -~Ll;}nZC
private void insertSort(int[] data) { ]AB<OjF1c|
int temp; |\#~
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); jpGZ&L7i&
} F,[GdE;P
} (uW$ch@2K
} "!g}Q*
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