ms8PFu(f
&\\iD :J
快速排序: 4:=eO!6
Xf.w(-
package org.rut.util.algorithm.support; (YjY=F
UN&b]vg
import org.rut.util.algorithm.SortUtil; 1R/=as,R
&8Cuu$T9)
/** =sP6
* @author treeroot LDL#*g
* @since 2006-2-2 '\:?FQ
C
* @version 1.0 Zcg=a_
*/ <dTo-P
public class QuickSort implements SortUtil.Sort{ edPnC
{?s
"R$ee^
/* (non-Javadoc) ;6o p|
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) =;{vfjj
*/ .Lrdw3(
public void sort(int[] data) { uBk$zs
quickSort(data,0,data.length-1); u OEFb
} Q:]F* p2
private void quickSort(int[] data,int i,int j){ ybtje=3E
int pivotIndex=(i+j)/2; ~9qDmt,i
//swap 47"ERfP
SortUtil.swap(data,pivotIndex,j); "[=Ee[/
Aa&3x~3+
int k=partition(data,i-1,j,data[j]); )gNHD?4x
SortUtil.swap(data,k,j); %Gn(b1X
if((k-i)>1) quickSort(data,i,k-1); v=:RxjEx
if((j-k)>1) quickSort(data,k+1,j); SvH=P!`+
@ :i>q$aF
} #jV6w=I
/** (tEW#l'}
* @param data :yvUHx
* @param i }k}5\%#li5
* @param j l\5}\9yS
* @return `xkJ.,#Io
*/ d}b#"A
private int partition(int[] data, int l, int r,int pivot) { EOV<|WF>
do{ 0[0</"K%1m
while(data[++l] while((r!=0)&&data[--r]>pivot); o([+Pp
SortUtil.swap(data,l,r); LiJ;A*
} ^!|BKH8>f%
while(l SortUtil.swap(data,l,r); ?x]T&S{
return l; $g#j,
} L[+65ce%*
(@`+Le
} $cH'9W}3K
8T
6jM+ h
改进后的快速排序: mxjY-Kq
J?5O2n
package org.rut.util.algorithm.support; P/t$xqAL
c*!bT$]~\
import org.rut.util.algorithm.SortUtil; 2:i`,
XaD}J:X q
/** z@&_3 Gl
* @author treeroot A1\;6W:
* @since 2006-2-2 xYRL4
* @version 1.0 Y&k'4Y%
*/ dvsOJj/b
public class ImprovedQuickSort implements SortUtil.Sort { <"CG%RGP
,Mc}U9)F
private static int MAX_STACK_SIZE=4096; O>w$
private static int THRESHOLD=10; =bf-+gZD
/* (non-Javadoc) Q=~e|
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 9ZG.%+l
*/ ,[+gE\z{{u
public void sort(int[] data) { [m!\ZK
int[] stack=new int[MAX_STACK_SIZE]; V
)1SZt@x
"xS",6Sy
int top=-1; ?{cF'RB.
int pivot; [ OMcSd|nf
int pivotIndex,l,r; vyqlP;K
[F+lVb
stack[++top]=0; yYWGM
stack[++top]=data.length-1; H@__%KBw
=5^L_, 4c2
while(top>0){ 6}Y^X
int j=stack[top--]; u&bo32fc
int i=stack[top--]; 1NN99^q
\8Fe56
pivotIndex=(i+j)/2; L ! yl^c
pivot=data[pivotIndex]; RIl%p~
>F,~ QHcz
SortUtil.swap(data,pivotIndex,j); |,t#Au}61
5`6@CRef
//partition d'^jekh
l=i-1; :(A]Bm3
r=j; &{y-}[~
do{ Hc^b}A y7
while(data[++l] while((r!=0)&&(data[--r]>pivot)); t
7;V`[
SortUtil.swap(data,l,r); !K(0)~u
} wvJm)Mj+
while(l SortUtil.swap(data,l,r); nd_d tsp#
SortUtil.swap(data,l,j); / $WEO[o
v2JC{XqrI
if((l-i)>THRESHOLD){ Lc+wS@
stack[++top]=i; t1g)Y|@d
stack[++top]=l-1; C#>c(-p>RC
} 8K6yqc H
if((j-l)>THRESHOLD){ Gnj|y?'
stack[++top]=l+1; aQ]C`9k
stack[++top]=j; N$>g)Ml?
} $0D]d.w=
2HkP$;lED
} Q>JJI:uC4
//new InsertSort().sort(data); 2@:Go`mg
insertSort(data); GJ
ZT~
} '`\\O:@C`
/** LurBqr
* @param data Po(9BRd7
*/ ?J6J#{LRd
private void insertSort(int[] data) { J'b*^K
int temp; E7oL{gU
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); Skp&W*Ai
} %@kmuz??
} uUwwR(R
} !95ZK.UT
#G$_\bt
} 4[Hf[.
z[}[:H8