]F
srk
-IS$1
快速排序:
!SThK8j$7
$|VD+[jSV
package org.rut.util.algorithm.support; $k^&
X
`
=\gK<Xh
import org.rut.util.algorithm.SortUtil; ^C~t)U
;aDYw [
/** ?i$MinK
* @author treeroot @=qWwt4~
* @since 2006-2-2 $KPf[JvQ
* @version 1.0 +r$VrNVs
*/ /2Bf6
public class QuickSort implements SortUtil.Sort{ 22R
,
>'v{o{k|C
/* (non-Javadoc) "@L|Z6U(
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) p~z\&&0U0
*/ GRAPv|u9[
public void sort(int[] data) { -#
/'^O+%
quickSort(data,0,data.length-1); :oytJhxU
} =xr2-K)e
private void quickSort(int[] data,int i,int j){ m6o o-muAr
int pivotIndex=(i+j)/2; C,$7fW{?
//swap xG|lmYt76
SortUtil.swap(data,pivotIndex,j); gW^0A)5
y<m}dW6[\
int k=partition(data,i-1,j,data[j]); /J!~0~F
SortUtil.swap(data,k,j); {4r } jH
if((k-i)>1) quickSort(data,i,k-1); TE-(Zil\
if((j-k)>1) quickSort(data,k+1,j); ;RS^^vDm
s:JQV
} *R8P brN
/** +oiuulA
* @param data 1 }_"2
* @param i 9,$
n6t;
* @param j y-_IMu.J`
* @return 4R&pb1eF
*/ B:fulgh2ni
private int partition(int[] data, int l, int r,int pivot) { K}QZdN']
do{ i([|@Y=
while(data[++l] while((r!=0)&&data[--r]>pivot); sPRs;to-
SortUtil.swap(data,l,r); QLb!e"C
} 95*=&d
while(l SortUtil.swap(data,l,r); HjT -5>I7f
return l; iz2;xa*
} 9n;6;K#
c. uD%
} xd!GRJ<I
7o9[cq w
改进后的快速排序: m 3Do+!M[
E2Ec`o
package org.rut.util.algorithm.support; jBJ|%KM
s}?QA cC
import org.rut.util.algorithm.SortUtil; 8[x{]l[
rGQY
/** v4r%'bA
* @author treeroot ms#|Yl1/|
* @since 2006-2-2 I]Vkaf I>(
* @version 1.0 a>#]d
*/ _^p\
u
public class ImprovedQuickSort implements SortUtil.Sort { "T.Qb/97@
EO"G(v
private static int MAX_STACK_SIZE=4096; (#rhD}
private static int THRESHOLD=10; U?j[
8z
/* (non-Javadoc) 1(qL),F;
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ap[Q'=A`
*/ >Dq&[9,8
public void sort(int[] data) { ~X,ZZ 9H
int[] stack=new int[MAX_STACK_SIZE]; Ki\J)l
p*~b5'+ C+
int top=-1; :</KgR0I
int pivot; y~<_ux,
int pivotIndex,l,r; oEsqLh9a|
M8|kmF\B
stack[++top]=0; 6o~CX
stack[++top]=data.length-1; a[RqK#
jUB`=d|
while(top>0){ .:iO$wjp5
int j=stack[top--]; Xd'B0kQaT
int i=stack[top--]; ?,
cI!c`
p;)@R$*
pivotIndex=(i+j)/2; 34t[]v|LD
pivot=data[pivotIndex]; h 2C9p2.
>Slu?{l'
SortUtil.swap(data,pivotIndex,j); YT<(2u#Ng
8xYeaK
//partition E]ZIm
l=i-1; ]?s^{
r=j; s:^Xtox/
do{ J:0`*7
while(data[++l] while((r!=0)&&(data[--r]>pivot)); U8 n=Ro
SortUtil.swap(data,l,r); Ns.{$'ll
} h`:B8+k
while(l SortUtil.swap(data,l,r); c4M]q4]F
SortUtil.swap(data,l,j); Ee'wsL
iM"L%6*I^
if((l-i)>THRESHOLD){ W=2#Q2)
stack[++top]=i; v+
"9&
stack[++top]=l-1; +uMK_ds~
} z/|tsVK
if((j-l)>THRESHOLD){ >C -N0H
stack[++top]=l+1; R?}<CjI
stack[++top]=j; DhT8Kh{
} xDIl
L4{+@T1A[
} 1V;,ZGI*
//new InsertSort().sort(data); ]9~6lx3/
insertSort(data);
^2uT!<2
} %RXFgm!{f
/** 2Y%E.){
* @param data J pKCux
*/ L[lS
>4eN
private void insertSort(int[] data) { j\2q2_f
int temp; 9Nu:{_YoP
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); >RXDuCVi
} ^Kn:T`vB
} 9 tIE+RD
} j_}f6d/h
7?2<W-n
} #A^(1
J;Eg"8x]