,| ~Pa
7;$[s6$
快速排序: %&pd`A/
O[W/=j[
package org.rut.util.algorithm.support; [BuAJ930#5
Yk=2ld;;
import org.rut.util.algorithm.SortUtil; 3h**y
%^
KhZ\q|5
/** [1g
* @author treeroot 2}U:6w
* @since 2006-2-2 UX@8
* @version 1.0 Z=zD~ka
*/ ~$]Puv1V>
public class QuickSort implements SortUtil.Sort{ Q&8epO |J
5;X3{$y
/* (non-Javadoc) qv)%)n
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) :[?65q{
*/ |C}= 1
public void sort(int[] data) { 8RjFp2)W
quickSort(data,0,data.length-1); wPl9%
} Tno 0Q
+
private void quickSort(int[] data,int i,int j){ Nbd[xs-lw
int pivotIndex=(i+j)/2; sDP8!
//swap } bm ^`QY
SortUtil.swap(data,pivotIndex,j); .wf$]oQQ
'pC51}[A{^
int k=partition(data,i-1,j,data[j]); C(&3L[
SortUtil.swap(data,k,j); wkKSL
if((k-i)>1) quickSort(data,i,k-1); 51Q~/
if((j-k)>1) quickSort(data,k+1,j); vBYk"a6SD
g]jCR*]
} g<^-[w4/
/** -> `R[k
* @param data ,$bK)|pGV
* @param i u+qj_Ej
* @param j A9o"L.o)
* @return %OJq( }
*/ MQq!<?/
private int partition(int[] data, int l, int r,int pivot) { 2 sK\.yS
do{ ^c?$$Tq
while(data[++l] while((r!=0)&&data[--r]>pivot); DsH#?h<-o
SortUtil.swap(data,l,r); CtE <9?
} o?S!o}
while(l SortUtil.swap(data,l,r); d /lV+yZ
return l; X][=(l!;w7
} M"5S
!NTt'4/F{
} 2-beq<I
yeIcQ%
改进后的快速排序: li9>zjz
!'*1;OQ
package org.rut.util.algorithm.support; `gz/?q
<`d;>r=4z
import org.rut.util.algorithm.SortUtil; ?JMy
%a|m[6+O
/** 2q ~y\fe
* @author treeroot V11XI<V
* @since 2006-2-2 Eg4_kp0Lq
* @version 1.0 :I8HRkp
*/ G3j'A{
public class ImprovedQuickSort implements SortUtil.Sort { VvTi>2(.
C=&;4In
private static int MAX_STACK_SIZE=4096; K(rWM>Jv
private static int THRESHOLD=10; w3jcit|
/* (non-Javadoc) XPT@ LM
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) l09DH+
*/ i/RA/q
public void sort(int[] data) { Xp0S
int[] stack=new int[MAX_STACK_SIZE]; Lc_cB`
);d"gv(]D
int top=-1; *Qy,?2
int pivot; aRcVoOq
int pivotIndex,l,r; N `[ ?db-%
Y7<(_p7
stack[++top]=0; #sM*<2vj
stack[++top]=data.length-1; t4<+]]
,tak{["
while(top>0){ y\ax?(z
int j=stack[top--]; 4DsHUc6
int i=stack[top--]; LN`Y`G|op
USzO):o
pivotIndex=(i+j)/2; 9](RZ6A+o
pivot=data[pivotIndex]; d$:LUxM#
3o`c`;H%p
SortUtil.swap(data,pivotIndex,j); 4P^CqD&i
v0KJKrliGO
//partition fT.MglJcb
l=i-1; ^CW{`eBwk
r=j; F[*/D/y(
do{ d0;<Cw~Tl
while(data[++l] while((r!=0)&&(data[--r]>pivot)); Zu|qN*N4
SortUtil.swap(data,l,r); F<