lV3x *4O=
\g&,@'uh
快速排序: !7O+ogL
T@H^BGs
package org.rut.util.algorithm.support; vFzRg5lH
^qvZXb
import org.rut.util.algorithm.SortUtil; 1APe=tJ
aB2FC$z
/** GE:vp>>}`
* @author treeroot 2. NN8PPD"
* @since 2006-2-2 DZ3wCLQtK
* @version 1.0 V# }!-Xj
*/ }1L4"}L.
public class QuickSort implements SortUtil.Sort{ )Yh+c=6
?
38Mv25N
/* (non-Javadoc) MIeU,KT#U
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) a_^\=&?'
*/ /Vx7mF:
public void sort(int[] data) { \"w"$9o6
quickSort(data,0,data.length-1); .ljnDL/
} pGP7nw_g
private void quickSort(int[] data,int i,int j){ jh?H.;**
int pivotIndex=(i+j)/2; Y#ap*
//swap _P#|IAq*
SortUtil.swap(data,pivotIndex,j); bI7Vwyz
z}77Eh<
int k=partition(data,i-1,j,data[j]); kf\PioD8
SortUtil.swap(data,k,j); q<x/Hat)
if((k-i)>1) quickSort(data,i,k-1); R^8o^z['6u
if((j-k)>1) quickSort(data,k+1,j); +B,}Q r
T8?Ghbn
} ,1.p%UE]>
/** <6%?OJhp
* @param data sg^zH8,3
* @param i pTth}JM>
* @param j M~Tuj1?
* @return f <Zxz9
*/ PV.Xz0@R
private int partition(int[] data, int l, int r,int pivot) { H*?t^
do{ Ea=8}6`s
while(data[++l] while((r!=0)&&data[--r]>pivot); D=A&+6B@-
SortUtil.swap(data,l,r); v ,i%Q$
} y>8sZuH0
while(l SortUtil.swap(data,l,r); nSDMOyj+
return l; p#ZCvPE;uH
} m+`cS=-.
nI?[rCM
} ch*8B(:
(U DnsF
改进后的快速排序: p%up)]?0
Pa>AWOG'
package org.rut.util.algorithm.support; \i>?q
Fk&c=V;SU
import org.rut.util.algorithm.SortUtil; o"s)eh
W<h)HhyG
/** k&M;,e3v6
* @author treeroot {r,.!;mHu
* @since 2006-2-2 ]? c
B:}
* @version 1.0 JMCKcZ%N
*/ ydEoC$?0
public class ImprovedQuickSort implements SortUtil.Sort { .r=4pQ@#
?>9/#Nv
private static int MAX_STACK_SIZE=4096; rET\n(AJ
private static int THRESHOLD=10; x;O[c3I
/* (non-Javadoc) <q58uuK
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ^`i#$
*/ ^x ]r`b
public void sort(int[] data) { :I] Mps<
int[] stack=new int[MAX_STACK_SIZE]; B9 _X;c
!NK1MU?T)
int top=-1; ~Py`P'+
int pivot; ;DQ ZT
int pivotIndex,l,r; wA ,6bj
*xAqnk
stack[++top]=0; ~f2z]JLr:
stack[++top]=data.length-1; x`eo"5.$
1 &jc/*Z"
while(top>0){ 4!{KWL`A
int j=stack[top--]; RXMISt3+{y
int i=stack[top--]; /aCc17>2V{
/$Ir5=B
pivotIndex=(i+j)/2; I.(,hFx;
pivot=data[pivotIndex]; {S]}.7`l9(
OU\ ~::
SortUtil.swap(data,pivotIndex,j); zEX
1/B>XkCJ
//partition /s&9SYF
l=i-1; |w~nVRb
r=j; ZoW?nxY
do{ G`D`Af/B
while(data[++l] while((r!=0)&&(data[--r]>pivot)); vQG5*pR*w
SortUtil.swap(data,l,r); |u% )gk
} Bpo4?nCl}
while(l SortUtil.swap(data,l,r); 5:[0z5Hww
SortUtil.swap(data,l,j); [C 7^r3w
88O8wJN
if((l-i)>THRESHOLD){ ]"As1"
stack[++top]=i; dw>C@c#"
stack[++top]=l-1; R{`(c/%8
} 6?gW-1mY
if((j-l)>THRESHOLD){ (*9$`!wS
stack[++top]=l+1; C\3rJy(VJ
stack[++top]=j; 8.1c?S
} 'T;P;:!\
_IHV7*u{;
} HQ_Ok`
//new InsertSort().sort(data); ^rR1ZVY
insertSort(data); kOrZv,qFG[
}
Ux!p8
/** bn&TF3b
* @param data "m$##X\
*/
IZ-1c1
private void insertSort(int[] data) { w>&aEv/f
int temp; !<8W
{LT
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); ' ,wFTV&
} yNJ B
oar
} gnf8l?M
} [ZwjOi:)
wc@X.Q[
} e`_LEv
&ee~p&S,>