?;)F_aHp
,Taq~
快速排序: ?{*/VJl$
.LHzaeJCX
package org.rut.util.algorithm.support; Cu+u'&U!
G .k\N(l
import org.rut.util.algorithm.SortUtil; piKR*|F
jneos~ 'n8
/** #R$[?fW
* @author treeroot b_j8g{/9
* @since 2006-2-2 t+Rt*yjO
* @version 1.0 ZpQ8KY$5
*/ /A~+32B
public class QuickSort implements SortUtil.Sort{ LS4|$X4H`!
&26H
/* (non-Javadoc) I &I
q
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) fE/|U|5L[
*/ JPfE`NZ
public void sort(int[] data) { TZ+2S93c
quickSort(data,0,data.length-1); `h|>;u
} >n^[-SWJCT
private void quickSort(int[] data,int i,int j){ G@;I^_gN
int pivotIndex=(i+j)/2; PFnq:G^L
//swap qQ "O;_
SortUtil.swap(data,pivotIndex,j); AilfeHG
$*i"rlJC
int k=partition(data,i-1,j,data[j]); gR:21*&cz
SortUtil.swap(data,k,j); |Zrkk>GW:
if((k-i)>1) quickSort(data,i,k-1); R~&i8n.
if((j-k)>1) quickSort(data,k+1,j); d8Kxtg
Y
=C.WM*= '
}
@s@67\
/** 5.e.
BT
* @param data 9K`uGu
* @param i Pb-Ft=
* @param j xg2
&
* @return M,b^W:('4
*/ ,HM~Zs
private int partition(int[] data, int l, int r,int pivot) { GBsM?A:
do{ tug\X
while(data[++l] while((r!=0)&&data[--r]>pivot); *X4$'LSx1
SortUtil.swap(data,l,r); |]9Z#lv+I
} YKsc[~
h
while(l SortUtil.swap(data,l,r); &,B91H*#
return l; Vz,2_QJ
} hu+% X.F4
_{5t/^w&!
} K'zG[[P
{l -V
改进后的快速排序: v
lsS
L/R ES
package org.rut.util.algorithm.support; @)YQiE$
3qc o2{nz
import org.rut.util.algorithm.SortUtil; t,yzqn
2i3& 3oz]O
/** eZWR)+aq
* @author treeroot @j Y_^8#S
* @since 2006-2-2 "gPAxt
* @version 1.0 _ooSMp|
*/ MjHjL~Tg
public class ImprovedQuickSort implements SortUtil.Sort { uJ! yM;{+
wzRIvm{
private static int MAX_STACK_SIZE=4096; ?~5J!|r#
private static int THRESHOLD=10; Xqac$%[3
/* (non-Javadoc) S(f V ,;Z
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) C8 b%r|^#
*/ Ag!#epi{0
public void sort(int[] data) { GCgpe(cQ
int[] stack=new int[MAX_STACK_SIZE]; a~-^$Fzgy
S3k>34_%9
int top=-1; hsUP5_
int pivot; T?Dq2UW
int pivotIndex,l,r; CF`fn6
UUt631
stack[++top]=0; p3NTI /-
stack[++top]=data.length-1; -)Y?1w
`(9B(&t^,
while(top>0){ /B?hM&@z
int j=stack[top--]; O<x53MN^
int i=stack[top--]; RO"*&o'K'
KrFV4J[
pivotIndex=(i+j)/2; Tcglt>tj"
pivot=data[pivotIndex]; [[[QBplJ
{:3XP<hqN
SortUtil.swap(data,pivotIndex,j); `f2m5qTP%
,j ('QvavJ
//partition ]PnE%
l=i-1; :-f"+v
r=j; '7<@(HO
do{ r]=3aebR.
while(data[++l] while((r!=0)&&(data[--r]>pivot)); j{nkus2
SortUtil.swap(data,l,r); kPVP+}cA
} diLjUC`69
while(l SortUtil.swap(data,l,r); y{eZrX|
SortUtil.swap(data,l,j); GZN@MK*co
S %"7`xl
if((l-i)>THRESHOLD){ )pVxp]EI
stack[++top]=i; [\ JZpF
stack[++top]=l-1; A/U tf0{3"
} n]B)\D+V^
if((j-l)>THRESHOLD){ N[$(y}
!s
stack[++top]=l+1; T_}\
stack[++top]=j; rwxJR@Ttn
} 7<=7RPWmD
i#jCf3%+
h
} ^saJfr x
//new InsertSort().sort(data); y(RbW_
?
insertSort(data); g"3h#SMb
} ,
"zS
pN
/** uREc9z`Q'
* @param data ~P5!VNJ;r
*/ Ej1 [ry
private void insertSort(int[] data) { Dz&4za+{
int temp; b)u9#%Q
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); d]e`t"Aj
} r)mm8MI!Z
} )N-+,Ms
} ZUyM:$
zYOPE 6E
} n20H{TA
IBVP4&}x$