w!"A$+~
,Mw93Kp
Va
快速排序: WdOxwsq"
(RI)<zaK
;
package org.rut.util.algorithm.support; C
r R/
$*eYiz3Ue
import org.rut.util.algorithm.SortUtil; [CEV&B
80Y%C-Y:
/** X QLP|v;"
* @author treeroot 8`L]<Dm
* @since 2006-2-2 %1TKgNf
* @version 1.0 3m&r?xZs
*/ Ar\fA)UQ`
public class QuickSort implements SortUtil.Sort{ !y$##PZ
oU)(/
/* (non-Javadoc) 7KiraKb|
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) @{b5x>KX
*/ v9H
t~\>
public void sort(int[] data) { B=*0
quickSort(data,0,data.length-1); R'Ue>k
} KAZ<w~55c
private void quickSort(int[] data,int i,int j){ :uAL(3pQ
int pivotIndex=(i+j)/2; [NE!
//swap >h%>s4W
SortUtil.swap(data,pivotIndex,j); U~=?I)Ni
k(G6` dY
int k=partition(data,i-1,j,data[j]); @Nb/n
SortUtil.swap(data,k,j); /$%&fo\[
if((k-i)>1) quickSort(data,i,k-1); 1M`>;fjYa
if((j-k)>1) quickSort(data,k+1,j); <SJ6<'
7[=G;2<
} 8qkQ*uJP
/** dm/3{\ 4
* @param data 7W}%ralkg
* @param i !F s$W
* @param j !r.-7hR $
* @return D'[:35z
*/ 9+y&&;p
private int partition(int[] data, int l, int r,int pivot) { ^nZ=B>Yn2
do{ 3]1 !g6
while(data[++l] while((r!=0)&&data[--r]>pivot); l'm|**
SortUtil.swap(data,l,r); ~H#c-B
} Oa:C'M
b
while(l SortUtil.swap(data,l,r); #qVvh3#g
return l; w &YUb,{Y
} ?J6Ek*E#
#NyO'
} )7Hx<?P
P4)Q5r
改进后的快速排序: gm5%X'XL
KRGj6g+
package org.rut.util.algorithm.support; E[t[R<v,P!
.feB
VRg
import org.rut.util.algorithm.SortUtil; ;m]
n l_vg
[BdRx`
/** ,(oolx"Xa
* @author treeroot [&~x5l
8\C
* @since 2006-2-2 '9]?jkl
* @version 1.0 DCa[?|Y
*/ i5(qJ/u
public class ImprovedQuickSort implements SortUtil.Sort { n]vCvmt
[3=Y 9P:
private static int MAX_STACK_SIZE=4096; ,l!>+@
private static int THRESHOLD=10; An>ai N]
/* (non-Javadoc) +D
@B eQu
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) w)J-e gc
*/ 5.-:)=
public void sort(int[] data) { r=.@APZB
int[] stack=new int[MAX_STACK_SIZE]; G "+[@|
f\?Rhyz
int top=-1; :!Z |_y{b
int pivot; 7`~0j6FY
int pivotIndex,l,r; _LgP
^%%Rf
stack[++top]=0; gjD|f2*x
stack[++top]=data.length-1; (8~mf$ zx,
V* JqC
while(top>0){ #5y+gdN
int j=stack[top--]; 8=bn
TJf
int i=stack[top--]; P;(@"gD8z5
O_s/BoB@
pivotIndex=(i+j)/2; %gn@B2z
pivot=data[pivotIndex]; Xqe Qj}2kA
Y\<w|LkD8
SortUtil.swap(data,pivotIndex,j); U5ph4G
VQf^ y q
//partition Uth+4Aq
l=i-1; $C=XSuPNK
r=j; c{`!$Z'k<
do{ ((AK7hb
while(data[++l] while((r!=0)&&(data[--r]>pivot)); mGg/F&G9
SortUtil.swap(data,l,r); {88|J'*L
} D',7 T=C
while(l SortUtil.swap(data,l,r); yS
K81`
SortUtil.swap(data,l,j); `tO t+>YWn
@lM-+q(tl
if((l-i)>THRESHOLD){ B]hRYU
stack[++top]=i; r]}6iF.
stack[++top]=l-1; <%^WZ:c
} <% mD#S
if((j-l)>THRESHOLD){ 6;~V@t
stack[++top]=l+1; B.?F^m@zS
stack[++top]=j; vp&.
} i\Yd_
%q r,Ssa/
} 5mVO9Qj
//new InsertSort().sort(data); YG?4DF
insertSort(data); &B:L9^
} [+5g 9tBJ
/** lO9Ixhf~iu
* @param data G]xYQ]
*/ kDJqT
private void insertSort(int[] data) { |61ns6i!
int temp; 4TQmEM,
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); Dg~m}La
} eo;MFd%;
} AD!w:jT9
} TqS s*as5
xIc||o$
} DHjfd+E=s
ORqqzy +