M_tY: v
J /3qJst
快速排序: ZMmaM "9
{HKd="%VG
package org.rut.util.algorithm.support; z=TaB^-)
# Ny
import org.rut.util.algorithm.SortUtil; WVc3C-h,
yT Pi/=G
/** 6X(Yv2X&4%
* @author treeroot 1JIL6w_
* @since 2006-2-2 ("{JNA/
* @version 1.0 zk8 o[4
*/ rrK&XP&
public class QuickSort implements SortUtil.Sort{ f, 9jK9/$
(~F{c0\C
/* (non-Javadoc) O5HK2Xg,C
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) V5y8VT=I
*/ hC ^|
public void sort(int[] data) { 1iq,Gd-G.
quickSort(data,0,data.length-1); <7HVkAa
} J&4QI( b.
private void quickSort(int[] data,int i,int j){ S pxkB!
int pivotIndex=(i+j)/2; c$),/0td|
//swap {6%vmMbJ
SortUtil.swap(data,pivotIndex,j); Fj\}&H*+
%,$Ms?,n`
int k=partition(data,i-1,j,data[j]); t3ua5xw
SortUtil.swap(data,k,j); uP<w rlW
if((k-i)>1) quickSort(data,i,k-1); 5urM,1SQ@
if((j-k)>1) quickSort(data,k+1,j); Xz)UH<
hzIP ?0^E
} {@Y|"qIN
/**
m9bR
%j
* @param data &jCT-dj
* @param i 1{N73]-M:
* @param j `YTagUq7
* @return 70NQ9*AAy
*/ ~[|&)}q
private int partition(int[] data, int l, int r,int pivot) { y+f@8]
do{ ( lbF/F>v
while(data[++l] while((r!=0)&&data[--r]>pivot); c"BFkw
SortUtil.swap(data,l,r); jf0D
} ,Y&LlB 2
while(l SortUtil.swap(data,l,r); Qs2E>C
return l; yidUtSv=,
} FQdz":5
7%?2>t3~
} DSG tt/n
WAPN,WuW
改进后的快速排序: :.kc1_veYS
(_G&S~@.
package org.rut.util.algorithm.support; [+0rlmB
Va^Y3/
import org.rut.util.algorithm.SortUtil; Z;kRQ
*yJCnoF
/** oTOr,Mn0\6
* @author treeroot R;,&s!\<
* @since 2006-2-2 N6wea]
* @version 1.0 cIqk=_]
*/ aty"6~
public class ImprovedQuickSort implements SortUtil.Sort { 4Q2=\-KFj
}7iWm XlI
private static int MAX_STACK_SIZE=4096; PI{;3X}9$,
private static int THRESHOLD=10; ;J|sH>i
/* (non-Javadoc) JmDi{B?
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) N3?hyR<T
*/ SN!TE,=I
public void sort(int[] data) { s*`_Ka57]~
int[] stack=new int[MAX_STACK_SIZE]; >ZMB}pt`
4;anoqiG\
int top=-1; M@$}Og
int pivot; /DOV/>@5%
int pivotIndex,l,r; &u5OL?>
hE>ux"_2/
stack[++top]=0; KL:x!GsV5e
stack[++top]=data.length-1; \7W>3
<a/TDW
while(top>0){ yOKpi&! r
int j=stack[top--]; shjc`Tqm
int i=stack[top--]; 5\RTy}w3x
=O= 0 D
pivotIndex=(i+j)/2; gycjIy@t
pivot=data[pivotIndex]; K)z{R n
6"@+Jz
SortUtil.swap(data,pivotIndex,j); 0* Ox>O>
EBjSK/
//partition MB]8iy8
l=i-1; @Qw~z0PE<l
r=j; ^(<Ecdz(
do{ e~#;ux
while(data[++l] while((r!=0)&&(data[--r]>pivot)); &R