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快速排序: G\S_e7$/
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package org.rut.util.algorithm.support; t-J\j"~%+
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import org.rut.util.algorithm.SortUtil; \MmKz^tO
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/** st(Y{Gs
* @author treeroot to'O;f">n
* @since 2006-2-2 D??
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* @version 1.0 CK} _xq2b
*/
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public class QuickSort implements SortUtil.Sort{ aaesgF
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/* (non-Javadoc) T:EUI]
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) yvKKE
*/ 1|#j/
public void sort(int[] data) { KHt#mQy)9
quickSort(data,0,data.length-1); 1VO>Bh.Wm
} g6<D 1r
private void quickSort(int[] data,int i,int j){ m9f[nT
int pivotIndex=(i+j)/2; VaylbYUCT/
//swap }kb6;4>c
SortUtil.swap(data,pivotIndex,j); A ]~%<=b
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int k=partition(data,i-1,j,data[j]); 5!^?H"#c
SortUtil.swap(data,k,j); (W$>!1~
if((k-i)>1) quickSort(data,i,k-1); TInp6w+u
if((j-k)>1) quickSort(data,k+1,j); r1Cq8vD*m
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}
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/** %KmhR2v
* @param data {DGnh1
* @param i *[wj )
* @param j L@LT *M
* @return 83YQ c
*/ V]A*' ke/
private int partition(int[] data, int l, int r,int pivot) { 1ba* U~OEg
do{ ?O#,|\v?]
while(data[++l] while((r!=0)&&data[--r]>pivot); hvU\l`m
SortUtil.swap(data,l,r); $3 ~/H"K
} !5h@uar
while(l SortUtil.swap(data,l,r); I)cA:Ip
return l; PsoW:t
} ++M%PF [
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改进后的快速排序: {'eF;!!Dy
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package org.rut.util.algorithm.support; m^ [VM&%
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import org.rut.util.algorithm.SortUtil; iQ_^MzA
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/** Z%O>|ozpq
* @author treeroot wDS(zG
* @since 2006-2-2 (
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* @version 1.0 a$P$Ngi?S
*/ |+(Hia,X
public class ImprovedQuickSort implements SortUtil.Sort { ^B7C8YP
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private static int MAX_STACK_SIZE=4096; w`r)B`!g
private static int THRESHOLD=10; 1 :d,8
/* (non-Javadoc) :s'hXo
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) H;rLU9b
*/
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public void sort(int[] data) { 7`Bwo*Y
int[] stack=new int[MAX_STACK_SIZE]; kv'gs+,e
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int top=-1; K_E- Hgg_
int pivot; R?GF,s<j
int pivotIndex,l,r; : yC|Q)
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stack[++top]=0; YO^iEI.
stack[++top]=data.length-1; W0>fu>
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while(top>0){ GjvTYg~
int j=stack[top--]; (dVrGa54
int i=stack[top--]; :#zv,U&OC
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pivotIndex=(i+j)/2; 0I@Cx{$
pivot=data[pivotIndex]; `di/nv)
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SortUtil.swap(data,pivotIndex,j); O/2Jz
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//partition vAp?Zl?g
l=i-1; -$m?ShDd
r=j; ^L;k
do{ Q.Ljz
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while(data[++l] while((r!=0)&&(data[--r]>pivot)); i@XFnt
SortUtil.swap(data,l,r); 5!)_"u3
} oc3}L^aD
while(l SortUtil.swap(data,l,r); (N25.}8Y
SortUtil.swap(data,l,j); mMRdnf!Uid
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if((l-i)>THRESHOLD){
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stack[++top]=i; @ag*zl
stack[++top]=l-1; @n:.D9
} D&r2k
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if((j-l)>THRESHOLD){ J=qPc}+
stack[++top]=l+1; bP ,_H
stack[++top]=j; }8cX0mZ1j
} PC}m.tE
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} rCa2$#Z
//new InsertSort().sort(data); z7P]g
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insertSort(data); =q-HR+
} ^U4|TR6mub
/** Z6vm!#\
* @param data @|GKNW#
*/ d~b#dcv$"
private void insertSort(int[] data) { B 8ycr~
int temp; I!1nB\l
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); Y2,\WKa
} $"&U%3
} aY7.<p*a
} hMiuv_EO!
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} U\Hd?&`9gz
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