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快速排序: $Bncdf
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package org.rut.util.algorithm.support; *-fd$l.
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import org.rut.util.algorithm.SortUtil; Vb#a ,t
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/** ^Os }sJ*5S
* @author treeroot V,VL?J\
* @since 2006-2-2 ?(R#
* @version 1.0 &qPezyt
*/ -0q|AB<
public class QuickSort implements SortUtil.Sort{ N2 3:+u<)E
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/* (non-Javadoc) fnr8{sr.2Z
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Q[#8ErUY
*/ 3f^jy(
public void sort(int[] data) { *^g]QQ
quickSort(data,0,data.length-1); Z2g<"M
} { Mb<onW
private void quickSort(int[] data,int i,int j){ ng|^Zm%
int pivotIndex=(i+j)/2; @8`I!fZ
//swap 3B%7SX
SortUtil.swap(data,pivotIndex,j); G na%|tUz|
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int k=partition(data,i-1,j,data[j]); '{~[e**
SortUtil.swap(data,k,j); WvF{`N
if((k-i)>1) quickSort(data,i,k-1); Q\IViM
if((j-k)>1) quickSort(data,k+1,j); "1a!]45 +
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} Q3=5q w^
/** SD*q+Si,1U
* @param data PHT<]:"`<
* @param i 'l!\2Wv2
* @param j E=,b;S-
* @return Oprfp^L
*/ s&o9LdL
private int partition(int[] data, int l, int r,int pivot) { I:oEt
do{ Ebj0 {ZL
while(data[++l] while((r!=0)&&data[--r]>pivot); w[l#0ZZ
SortUtil.swap(data,l,r); rxMo7px@}I
} =$bF[3D
while(l SortUtil.swap(data,l,r); NTZ3Np`
return l; kq(><T
} F~E)w5?\O
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改进后的快速排序: iNl<<0a
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package org.rut.util.algorithm.support; 4<}@hk
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import org.rut.util.algorithm.SortUtil; :,v(lq
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/** MIkp4A
* @author treeroot .eVX/6,
* @since 2006-2-2 L.;x=w
* @version 1.0 ?&,6Y'"
*/ rq7yNt
public class ImprovedQuickSort implements SortUtil.Sort { 3k>#z%//
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private static int MAX_STACK_SIZE=4096; '^WR5P<8c
private static int THRESHOLD=10; (t5y$bc
/* (non-Javadoc) }yrs6pQ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) zb[kRo&a0W
*/ g%]<sRl:-
public void sort(int[] data) { PCgr`($U
int[] stack=new int[MAX_STACK_SIZE]; h"8[1
;
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int top=-1; ziO(`"v
int pivot; fX,O9d$
int pivotIndex,l,r; 9'~qA(=.?
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stack[++top]=0; Z>3~n
stack[++top]=data.length-1; [ywF!#'){
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while(top>0){ 7=X6_AD
int j=stack[top--]; ^J^~5q8
int i=stack[top--]; WwnBe"7M
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pivotIndex=(i+j)/2; O"TVxP:
pivot=data[pivotIndex]; 2<n18-|OQ
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SortUtil.swap(data,pivotIndex,j); ,-EN{ed
Brs}
//partition >m%TUQ#%
l=i-1; 't8!.k
r=j; RaTNA W)v>
do{ NW0se
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while(data[++l] while((r!=0)&&(data[--r]>pivot)); yVn%Bz'
[
SortUtil.swap(data,l,r); =z9,=rR4
}
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while(l SortUtil.swap(data,l,r); j?$B@Zk
SortUtil.swap(data,l,j); DH_~,tK9
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if((l-i)>THRESHOLD){ 6.45^'t]
stack[++top]=i; <=%[.. (S
stack[++top]=l-1; &u[F)|
} [D+PDR
if((j-l)>THRESHOLD){ GFbn>dY
stack[++top]=l+1; V#b*:E.cA
stack[++top]=j; <x;g9Z>(
} jM6$R1HX
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} B&59c*K
//new InsertSort().sort(data); Z \ @9*
insertSort(data); .@mZG<vg
} s/~[/2[bnf
/** RDQ]_wsyKG
* @param data O(0a l#Fvj
*/ BOvJEs!UX
private void insertSort(int[] data) { mqJD+ K
int temp; `'r]Oe
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); '#j6ZC/?
} 8aRmHy"9l
} Bw`? zd\*
} ^_G#JJ\@$
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} 3ZSU^v
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