TH6g:YP`7
gQ/zk3?k
快速排序: L:B&`,E
-M[5K/[
package org.rut.util.algorithm.support; k`TEA?RfQ
eKLxNw5
import org.rut.util.algorithm.SortUtil; PU-;Q@< E
U15Hq*8Z
/** (dO4ww@O
* @author treeroot Ye1P5+W(
* @since 2006-2-2 [_H9l)
* @version 1.0 M(/%w"R
*/ B>~E6j7[Mp
public class QuickSort implements SortUtil.Sort{
bJ/~UEZw
<y`yKXzBUV
/* (non-Javadoc) T8qG9)~3
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Q7#Q6-Q
*/ Ui1K66{
public void sort(int[] data) { -{P)\5.L
quickSort(data,0,data.length-1); pGsVO5M?
} $wX5`d1
private void quickSort(int[] data,int i,int j){ ^s24f?3
int pivotIndex=(i+j)/2; Iem* 'r
//swap 9prG@
SortUtil.swap(data,pivotIndex,j); F /t;y\)
o*dhks[
int k=partition(data,i-1,j,data[j]); ,Xb :f/lB
SortUtil.swap(data,k,j); rU'&o) a^
if((k-i)>1) quickSort(data,i,k-1); 7 H<_
wW
if((j-k)>1) quickSort(data,k+1,j); cJH7zumM)
8SKDL[rN
} w@oq.K
/** VDQ&BmJE
* @param data -G*u2i_*
* @param i <vbk@d
* @param j hr)TC-
* @return S9xC> |<
*/ r{Fu|aoa;5
private int partition(int[] data, int l, int r,int pivot) { 6|9];)
do{ iOD9lR`s
while(data[++l] while((r!=0)&&data[--r]>pivot); wePMBL1P*
SortUtil.swap(data,l,r); w|$;$a7)
} JXvHsCd?
while(l SortUtil.swap(data,l,r); iAXx`>}m
return l; DpTQP u9
} T mUn/
-98bX]8
} Y3-15:-
o]k[l;
改进后的快速排序: n}._Nb
5
(r7~ccy4
package org.rut.util.algorithm.support; V#sANi?mpo
+/UInAM
import org.rut.util.algorithm.SortUtil; Ya,>E@oc
oTfEX4 t {
/** %7L'2/Y2x
* @author treeroot ~}TVM%0RTq
* @since 2006-2-2 Rhr]ML
* @version 1.0 \w`Il"}V
*/ +L X&1GX
public class ImprovedQuickSort implements SortUtil.Sort { NP|U
|zn
.0s/O
private static int MAX_STACK_SIZE=4096; 9^jO^[>
private static int THRESHOLD=10; ,',fO?Qv'
/* (non-Javadoc) "w|GIjE+
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) .>H7i`1D`
*/ `#9ZP
public void sort(int[] data) { UkeW2l`:
int[] stack=new int[MAX_STACK_SIZE]; )_f
"[m%
i>0bI^H
int top=-1; XSZW9/I-(|
int pivot; vbA9V<c&
int pivotIndex,l,r; Y.&z $+
irrQ$N}
stack[++top]=0; f)gA.Rz
stack[++top]=data.length-1; Q OdvzVy<
$R"~BZbt;
while(top>0){ )|2g#hH5
int j=stack[top--]; 7$b78wax
int i=stack[top--]; r)*KgGsk
9fe~Q%x=u
pivotIndex=(i+j)/2; 2"%d!"
pivot=data[pivotIndex]; N!btj,vx
&;C|=8eB
SortUtil.swap(data,pivotIndex,j); WRD^S:`BH
WXGLo;+>I
//partition `)SkA?yKI
l=i-1; m2\ZnC
r=j; \d
v9:X$
do{ k.0$~juu
while(data[++l] while((r!=0)&&(data[--r]>pivot)); 0R*!o\y
SortUtil.swap(data,l,r); 1k
"*@Z<
} ukhI'alS,
while(l SortUtil.swap(data,l,r); KqB(W,$
SortUtil.swap(data,l,j); rsiG]o=8
V_Y SYG9f
if((l-i)>THRESHOLD){ !QC->
stack[++top]=i; N !H iQ
stack[++top]=l-1; 'm-s8]-W
} Vwl`A3Y
if((j-l)>THRESHOLD){ bC"#.e
stack[++top]=l+1; u QCQ$
stack[++top]=j; 4UG7{[!+
} n {^D_S
;2&(]1X
} $'kIo*cZ
//new InsertSort().sort(data);
E#ti
insertSort(data); m-ZVl j
} fq\E$'o$
/** NlWIb2,
* @param data lgre@M]mg
*/ C+2*m=r
private void insertSort(int[] data) { wYS4#7
int temp; `)K1[&
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); z`{Ld9W
} ?l
bK;Kv
} E+[K?W5
} }0qgvw
Qs</.PO
} P>jlFm
U%U%a,rA5s