hR] AUH
^6Std
x_
快速排序: *Y@)t*
-a
hjgxCSp
package org.rut.util.algorithm.support; -'sn0_q/e
);cu{GY
import org.rut.util.algorithm.SortUtil; vX'@we7Q{
%ys-y?r
/** pNHO;N[&
* @author treeroot >^ E
* @since 2006-2-2 kr_!AW<.tz
* @version 1.0 njk1x
*/ ?xTh}Sky
public class QuickSort implements SortUtil.Sort{ g7|$JevR0
r:&"#F
/* (non-Javadoc) 77Fpb?0`
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) iSZiJ4AUq
*/ l/JE}Eg(
public void sort(int[] data) { zMXlLRC0
quickSort(data,0,data.length-1); :IZ(9=hs
} ?rD`'B
private void quickSort(int[] data,int i,int j){ ^lP_{c
int pivotIndex=(i+j)/2; ?QnVWu2K
//swap SnhB$DG
SortUtil.swap(data,pivotIndex,j); B f_oIc
;bZIj`D(
int k=partition(data,i-1,j,data[j]); /cy'% .!
SortUtil.swap(data,k,j); iuX82z`
if((k-i)>1) quickSort(data,i,k-1); CulU?-[i
if((j-k)>1) quickSort(data,k+1,j); \rw/d5.
ma\UJz
} `xhiG9mz~
/** 2nQrCdRC
* @param data sc2nLyn$
* @param i _`bH$
* @param j B~_='0Gm[
* @return ;gh#8JkI
*/ G*;}6 bj|?
private int partition(int[] data, int l, int r,int pivot) { tv)U 7K0
do{ -bamNw>|
while(data[++l] while((r!=0)&&data[--r]>pivot); MBbycI,
SortUtil.swap(data,l,r); +n
$ {6/
} }^Unx W
while(l SortUtil.swap(data,l,r); e%v<nGN.-
return l; jDp]}d|f)
} J#0oL_xY#
C^hHt,&
} EzDj,!!<w
`J>76WN
改进后的快速排序: ;?y*@*2u
_d$0(
package org.rut.util.algorithm.support; :.-z) C}
o|s JTY
import org.rut.util.algorithm.SortUtil; #L{+V?
.Z!!x
/** RsYn6ozb
* @author treeroot +7jr ]kP9
* @since 2006-2-2 PC| U]
* @version 1.0 +P7A`{Ae
*/ T41&;?-
public class ImprovedQuickSort implements SortUtil.Sort { ]to"X7/
::y+|V/
private static int MAX_STACK_SIZE=4096; ]y'/7U+
private static int THRESHOLD=10; e#YQA
/* (non-Javadoc) _l&`*
2d
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) KUdpOMYX
*/ >+[uV^2[
public void sort(int[] data) { )V^J^1
int[] stack=new int[MAX_STACK_SIZE]; .qyk [O
wp!<u
%
int top=-1; IX7|_ci
int pivot; -$(,&qyk
int pivotIndex,l,r; )
#/@Jo2F
({ 7tp!@
stack[++top]=0; DR o@gYDn
stack[++top]=data.length-1; y&0&K4aa
uA?_\z?
while(top>0){ #rZk&q
int j=stack[top--]; Tr1#=&N0
int i=stack[top--]; yqF$J"=|
nb:J"
pivotIndex=(i+j)/2; Ul?Ha{W
pivot=data[pivotIndex]; A2o;YyF
S8O^^jJq;
SortUtil.swap(data,pivotIndex,j); .wrNRU7s
=a`l1zn8=
//partition g8yWFqE!T
l=i-1; `A.!<bO)]
r=j; f:k3j}&
do{ -R,[/7zj
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 8c m,G
SortUtil.swap(data,l,r); OCzWP,
} V|> u,
while(l SortUtil.swap(data,l,r); fCSM#3|,]
SortUtil.swap(data,l,j); *v'&i) J
"hU'o&
if((l-i)>THRESHOLD){ ^;3z9}9
stack[++top]=i; H( `^1
stack[++top]=l-1; //G5lW/*
} XelY?Ph,,
if((j-l)>THRESHOLD){ -{>Nrx|
stack[++top]=l+1; [=Wn7cr
stack[++top]=j; p6(n\eg R
} "HW~|M7>(
(9h{7<wD`
} fW Vd[zuD4
//new InsertSort().sort(data); D-.XSIEMu
insertSort(data); Ox"4 y
} ?aInn:FE
/** k/vE|
* @param data Q)}sX6TB
*/ hq.z:D
private void insertSort(int[] data) { cLH|;
int temp; Bv$;yR
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); tw8@&8"
} yV:DR
} <CL0@?*i9
} D"F5-s7
jxL5L[
} byM/LE7)
\oPW