].eY]o}=
SAEV "
快速排序: 8?7gyp!k_f
$ (gR^L
package org.rut.util.algorithm.support; }w)`)N
E |A,NPf%I
import org.rut.util.algorithm.SortUtil; /:}z*a
zjrr*iw
/** 7o4 vf~
* @author treeroot %Jpb&CEY
* @since 2006-2-2 F& 'HZX
* @version 1.0 Mwdw7MZ"S
*/ a;A&>Ei}
public class QuickSort implements SortUtil.Sort{ > HL8hN'q'
d[9NNm*htC
/* (non-Javadoc) U "qO&;m
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) H5N(MihT
*/ r]=3aebR.
public void sort(int[] data) { N3};M~\
quickSort(data,0,data.length-1); N
-]m <z>
} swDSV1alMB
private void quickSort(int[] data,int i,int j){ S"=oU}'|
int pivotIndex=(i+j)/2; "iof -b=ys
//swap h ,@x5q>g
SortUtil.swap(data,pivotIndex,j); N[$(y}
!s
^j2:fJOU#
int k=partition(data,i-1,j,data[j]); QsmG(1=
SortUtil.swap(data,k,j); k*4?fr
if((k-i)>1) quickSort(data,i,k-1); _e_]$G/TM
if((j-k)>1) quickSort(data,k+1,j); "z }bgy
uREc9z`Q'
} S)"5X)mq
/** n#N<zC/
* @param data >NE]TZ.F
* @param i
FFgy=F
* @param j q\[31$i$
* @return ,gU9ywg
*/ <MN+2^ed&
private int partition(int[] data, int l, int r,int pivot) { XEZ6%Q_
do{ 7l Aa6"Y68
while(data[++l] while((r!=0)&&data[--r]>pivot); [,5clR=F
SortUtil.swap(data,l,r); -o#0Yt}3
} r _r$nl
while(l SortUtil.swap(data,l,r); su=.4JcK
return l; CRWO R pP
} [jumq1
!*%3um
} ,)L.^<
2$NP46z}
改进后的快速排序: /KKX;L[D(
2
;B[n;Q{
package org.rut.util.algorithm.support; ==(M
vu`
4r(rWlM
import org.rut.util.algorithm.SortUtil; ]Wa,a
T'
wq]nz!
/** Iz{AA-
* @author treeroot L761m7J]B
* @since 2006-2-2 sCb?TyN'n
* @version 1.0 &8&WY1cU
*/ u gfV'
public class ImprovedQuickSort implements SortUtil.Sort { v!`M=0k
db%`-UST
private static int MAX_STACK_SIZE=4096; 6ldDt?iSg
private static int THRESHOLD=10; q>omCk%h
/* (non-Javadoc) nMc-kyl{
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) G8oQSo;D
*/ .Yu,&HR
public void sort(int[] data) { -`?V8OwY]
int[] stack=new int[MAX_STACK_SIZE]; eB]ZnJ2^=
"J{,P9P6
int top=-1; alu`T
c~
int pivot; Y2$%%@
int pivotIndex,l,r; `aI%laj&M
\|&5eeE@
stack[++top]=0; /r?X33D!
stack[++top]=data.length-1; mA>Pr<aV:
=q"3a9pb7
while(top>0){ -0\$JAyrx
int j=stack[top--]; nEn2!)$
int i=stack[top--]; j/Kw-h ,5"
G/`_$ c
pivotIndex=(i+j)/2; (?3(=+t
pivot=data[pivotIndex]; ]JM9 ^F
D>1Dao
SortUtil.swap(data,pivotIndex,j); )t.q[O`
?D~uR2+Z
//partition . }1!MK5
l=i-1; A P\E
r=j; -FPl",f=r
do{ 2Vi[qS^
while(data[++l] while((r!=0)&&(data[--r]>pivot)); FJ[(dGKeE
SortUtil.swap(data,l,r); ;}PL/L$L6;
} fAm2ls7c
while(l SortUtil.swap(data,l,r); #QB`'2)vw
SortUtil.swap(data,l,j);
)Ob{]
>]`x~cE.5
if((l-i)>THRESHOLD){ a&<<X:$Hy
stack[++top]=i; 4q~E\l|.5
stack[++top]=l-1; bC{~/ JP
} \E30.>%,
if((j-l)>THRESHOLD){ Q7s1M&K
stack[++top]=l+1; lV1|\~?4
stack[++top]=j; R3<+z
} GQQ!3LwP\O
WV% KoM,%
} 5SjS~9
//new InsertSort().sort(data); )2A4vU-IR.
insertSort(data); $OO[C={v[
} t&oNJq{
/**
1Li@O[%X<
* @param data t>[r88v
*/ t Z%?vY~!
private void insertSort(int[] data) { nGt8u4gcP
int temp; 4M]8po/;
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); kmS8>O
} (!b:
gG
} bODl
q
} \z{Y(dS
1m0':n Vdu
} P8jK
yo
W< n`[