pZ $>Hh#
/#5rt&q
快速排序: 46M=R-7=
Ri"rT] '
package org.rut.util.algorithm.support; iwIn3R,
5X8 i=M;
import org.rut.util.algorithm.SortUtil; /.s
L[X-G
/@Jg [na
/** $[_5:@T%N
* @author treeroot krGIE}5
* @since 2006-2-2 CUB;0J(
* @version 1.0 ^?|4<Rm
*/ bv41et+Kb
public class QuickSort implements SortUtil.Sort{ /?BTET
0rX%z$D+@
/* (non-Javadoc) 2K3j3 |T
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) yC@PMyE]
*/ -7oIphJ=\
public void sort(int[] data) { ` *hTx|!'
quickSort(data,0,data.length-1); DmWa!5
} {Mo[C%
private void quickSort(int[] data,int i,int j){ `?^<r%*F.
int pivotIndex=(i+j)/2; /g0' +DP
//swap X'.lh#&
SortUtil.swap(data,pivotIndex,j); .`*(#9(M9
8bw,dBN
int k=partition(data,i-1,j,data[j]); gdAd7
T
SortUtil.swap(data,k,j); {OQ)Np!
if((k-i)>1) quickSort(data,i,k-1); WCaMPz
if((j-k)>1) quickSort(data,k+1,j); )4ok@^.
^^V+0 l
} J;V#a=I
/** P;7[5HFF
* @param data %U<lS.i
* @param i aA%x9\Y
* @param j Yjy%MR
* @return J>hjIN
*/
'mv|6Y
private int partition(int[] data, int l, int r,int pivot) { 6."|m+D
do{ 6QHUBm2
while(data[++l] while((r!=0)&&data[--r]>pivot); 0/fwAp
SortUtil.swap(data,l,r); ?t;,Nk`jx
} W;X:U.
while(l SortUtil.swap(data,l,r); x wfdJ(&
return l; G=Xas"|
} Nog{w
<e|B7<.
} # b3 14
.lgm"
改进后的快速排序: aTaL|&(
zYis~+
package org.rut.util.algorithm.support; BL0xSNE**
1[Q~&QC
import org.rut.util.algorithm.SortUtil; H_iQR9Ak7
us#ji i.<
/** (6)|v S
* @author treeroot =m;cy0))
* @since 2006-2-2 1<]?@[l<
* @version 1.0 .L)j
ql%
*/ /Zz[vf
public class ImprovedQuickSort implements SortUtil.Sort { 43`Atw`\
;TTH
private static int MAX_STACK_SIZE=4096; }J|Pd3Q Sf
private static int THRESHOLD=10; [vyi_0[
/* (non-Javadoc) ~SR9*<
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) clO9l=g
*/ ?S~j2 J]
public void sort(int[] data) { <t"|wYAa_
int[] stack=new int[MAX_STACK_SIZE]; 2 s<uT
vC>8:3Zaq
int top=-1; C`r{B.t`GT
int pivot; VVDd39q
int pivotIndex,l,r; \9T/%[r#
< r7s,][&
stack[++top]=0; VDy\2-b8d
stack[++top]=data.length-1; ;FO( mL (
<X~P62<
while(top>0){ YK6zN>M}E
int j=stack[top--]; QeNN*@
='i
int i=stack[top--]; X>4qL'b:z
fsz:A"0H
pivotIndex=(i+j)/2; 8a,pDE
pivot=data[pivotIndex]; vvmG46IgZ
PiZU_~A
SortUtil.swap(data,pivotIndex,j); dxK3462
r%UsUj
//partition RgTrj
l=i-1; 8\B]!
r=j; j$Wd[Ja+O
do{ Dwg_#GSr
while(data[++l] while((r!=0)&&(data[--r]>pivot)); WI}cXXUKm0
SortUtil.swap(data,l,r); <%GfF![v
} zyPc<\HoK
while(l SortUtil.swap(data,l,r); d_aHUmI^"
SortUtil.swap(data,l,j); 9L9qLF5 t
Z|6,*XEc
if((l-i)>THRESHOLD){ EEdU\9DH(
stack[++top]=i; K0C3s
stack[++top]=l-1; o#9Q
} lNba[;_
if((j-l)>THRESHOLD){ f S-PM3
stack[++top]=l+1; wjc&