ba"_!D1
] vQU(@+I
快速排序: JTS<n4<a
5T-CAkR{n
package org.rut.util.algorithm.support; 8b|m6 6#|
s~b!3l`gu
import org.rut.util.algorithm.SortUtil; @|;XDO`k;
rx\f:-3g
/** $=ua$R4Z+
* @author treeroot jQX9KwSP
* @since 2006-2-2 Egm-PoPe
* @version 1.0 X B[C&3I
*/ J,_IHzO~Z
public class QuickSort implements SortUtil.Sort{ @"vTz8oY@
q6T>y%|FZ
/* (non-Javadoc) Pm=i(TBS/
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) q+1SU6x'm
*/ 0N`'a?x
public void sort(int[] data) { rhH !-`m
quickSort(data,0,data.length-1); Sd?+j;/"
} cS;O]>/5
private void quickSort(int[] data,int i,int j){ y"nL9r.,:
int pivotIndex=(i+j)/2; +V,Ld&r
//swap 5cZKk/"Ad}
SortUtil.swap(data,pivotIndex,j); KKGwMJku}
JrJTIUf_
int k=partition(data,i-1,j,data[j]); mKZ^FgG
SortUtil.swap(data,k,j); "SFs\] Z
if((k-i)>1) quickSort(data,i,k-1); <,+6:NmT
if((j-k)>1) quickSort(data,k+1,j); m'"Ra-
FZ@8&T
} G_5E#{u
/** 1vL$k[^&d
* @param data G1S:hw%rp
* @param i ;_D5]kl`
* @param j pWN5 >HV
* @return L.$+W}
*/ kT,2eel
private int partition(int[] data, int l, int r,int pivot) { 1g1gu=|Q
do{ e*/ya 8p?
while(data[++l] while((r!=0)&&data[--r]>pivot); G}0fk]%\:
SortUtil.swap(data,l,r); mP+rPDGp
} kOLS<>.
while(l SortUtil.swap(data,l,r); qp`G5bw
return l; .9u,54t
} a4D4*=!G0
}<
m@82\
} hZDv5]V:0
O/{W:hJjd
改进后的快速排序: ~\~XD+jy"
*h Bo,
package org.rut.util.algorithm.support; pNzpT!}H>
xx
EcmS#>
import org.rut.util.algorithm.SortUtil; 5:x .<
O\[Td
/** BGZvgMxLJ
* @author treeroot /u N3"m5i
* @since 2006-2-2 7).zed^
* @version 1.0 R WK##VHK
*/ Dwi[aC+k
public class ImprovedQuickSort implements SortUtil.Sort { :rX/ILAr
iT"H%{+~
private static int MAX_STACK_SIZE=4096; @V5'+^O
private static int THRESHOLD=10; G[[NDK
/* (non-Javadoc) G8ksm2 }
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) :O{oVR
*/ `Ef&h V
public void sort(int[] data) { ^><B5A>;
int[] stack=new int[MAX_STACK_SIZE]; ,O}2LaK.O
YcJ2Arml
int top=-1; hR3Pa'/i
int pivot; 0CS80
pC
int pivotIndex,l,r; ^jMo?Zwy
+gsk}>"
stack[++top]=0; 7LdNE|IP
stack[++top]=data.length-1; S&m5]h!D
Le':b2o
while(top>0){ B\a#Vtyut
int j=stack[top--]; L7&|
int i=stack[top--]; L~~Dj:%uq
gHzjI[WI
pivotIndex=(i+j)/2; )QiHe}
pivot=data[pivotIndex]; R
WU,v{I9
qnZ`]?
SortUtil.swap(data,pivotIndex,j); ;o0o6pF
7f`x-iH!]7
//partition )gAFz+
l=i-1; Q`X5W
r=j; N~A#itmdx
do{ |Zo_x}0
while(data[++l] while((r!=0)&&(data[--r]>pivot)); R(sa.Q\D4
SortUtil.swap(data,l,r); r
,,A%
} G
]mX+?
while(l SortUtil.swap(data,l,r); p3r1lUw
SortUtil.swap(data,l,j); P!)k 4n
oNV(C'A
if((l-i)>THRESHOLD){ @5# RGM)5^
stack[++top]=i; =7Y gES
stack[++top]=l-1; "yCek
} A*:(%!
if((j-l)>THRESHOLD){ |fk,&5s
stack[++top]=l+1; @9rmm)TZ
stack[++top]=j; NX*9nwp^
} CQcb !T
6c>tA2G|8
} !OJSQB,
//new InsertSort().sort(data); 'k9hzk(*
insertSort(data); ;Q.g[[J/p
} {@u}-6:wAT
/** m 5NF)eL
* @param data x6x6N&f?
*/ s!E-+Gw
private void insertSort(int[] data) { ^Y:Q%?uB/
int temp; sE8.,\
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); Pk; 9\0k7
} K,IPVjS
} p3eJFg$
} r_Rjjo
uGQCW\!"4
} ]&ptld;
N2_ =^s7