nKh._bvfX
:*6tbUp
快速排序: 6A/Nlk.
Zcz)FP#
package org.rut.util.algorithm.support; xZL`<3?
HH2*12e
import org.rut.util.algorithm.SortUtil; Lqbu]
W9Bl'e
/** oyJ/Oe
{
* @author treeroot Cfb/f]*M
* @since 2006-2-2 zpIl'/i
* @version 1.0 2:/'
*/ 2,;+)
public class QuickSort implements SortUtil.Sort{ EH] 5ZZ[Z
6U7z8NV&[
/* (non-Javadoc) RWXj)H)w
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) F1)Q#ThF\
*/ Hv<%_t_/
public void sort(int[] data) { l8%x(N4
quickSort(data,0,data.length-1); iH(
K[F /
} r&xqsZ%R
private void quickSort(int[] data,int i,int j){ czb(&><
int pivotIndex=(i+j)/2; QO7> XHn
//swap 5}~*,_J2Z
SortUtil.swap(data,pivotIndex,j); oFHVA!lqe
9ToM5oQ
int k=partition(data,i-1,j,data[j]); J~DP*}~XK
SortUtil.swap(data,k,j); 1U~AupHE
if((k-i)>1) quickSort(data,i,k-1); -Z<e`iFQS
if((j-k)>1) quickSort(data,k+1,j); &m4
\"X@
M,t8<y4W/
} @"kA&=0;|J
/** i,S%:0c7)
* @param data |VlAt#E
* @param i rc*&K#? B
* @param j RV^2[Gdi
* @return 4G@vO{$
*/ [lQp4xgxi
private int partition(int[] data, int l, int r,int pivot) { ,ye>D='
do{ %g0"Kj5
while(data[++l] while((r!=0)&&data[--r]>pivot); c$?qN&X_K
SortUtil.swap(data,l,r); eP'e_E
} ]NuY{T&:
while(l SortUtil.swap(data,l,r); FI*.2rdSR
return l; \"_;rJ{!aE
} RXt`y62yK
} ~=53$+
} <jw`"L[D
]BP/KCjAI<
改进后的快速排序: 3oxQ[.o
X5qU>'?`
package org.rut.util.algorithm.support; Rh9>iA@fd
5 &-fX:/
import org.rut.util.algorithm.SortUtil; eOD;@4lR
A,lcR:@w
/** QXq~e
* @author treeroot 8:$kFy\A'
* @since 2006-2-2 Q2^}NQO=
* @version 1.0 E`XUK,b
*/ 3l`yy])t
public class ImprovedQuickSort implements SortUtil.Sort { [G[HQ)A
b\][ x6zJp
private static int MAX_STACK_SIZE=4096; _7]5Q
private static int THRESHOLD=10; <3
AkF# C9
/* (non-Javadoc) idPkJf/
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) i{ T0[\4
*/ /I$g .f/#
public void sort(int[] data) { 8_Y{7;<ey
int[] stack=new int[MAX_STACK_SIZE]; {TzKHnP
]J;^< 4l
int top=-1; ]! [ewO@
int pivot; @a>+r1
int pivotIndex,l,r; ECg/ge2
ilayU
stack[++top]=0; H=Yl
@
stack[++top]=data.length-1; 5$GE 3IER8
u+[ZWhKUp
while(top>0){ rA8neO)
int j=stack[top--]; YqR
MVWcnk
int i=stack[top--]; }3lM+]pf
H]UM2.
pivotIndex=(i+j)/2; iIcO_ZyA
pivot=data[pivotIndex]; "]kaaF$U%
V`S6cmwdc\
SortUtil.swap(data,pivotIndex,j); GZXUB0W\@)
l
K}('7\
//partition L;fhJ~r
l=i-1; +X
cB 5S>
r=j; q^([ & +
do{ K}`.?6O
while(data[++l] while((r!=0)&&(data[--r]>pivot)); ZaH<\`=%
SortUtil.swap(data,l,r); f*1.Vg0`-
} F FR_1Vf
while(l SortUtil.swap(data,l,r); K$#(\-M
SortUtil.swap(data,l,j); h+,zfVJu
JT[|l-\zo
if((l-i)>THRESHOLD){ %Ni)^
stack[++top]=i; i?qS8h{
stack[++top]=l-1; 9d#-;qV
} HR\yJt
if((j-l)>THRESHOLD){ < I8hy$+6
stack[++top]=l+1; {/XzIOO;b
stack[++top]=j; .FqbX5\p,
} >Ah [uM
Eae]s8ek9
} ysGK5kFz
//new InsertSort().sort(data); asj^K|.z
insertSort(data); %:N5k+}
} IZi1N
/** 35B0L.R
* @param data fk#SD "iJ
*/ 2o6KVQ
private void insertSort(int[] data) { ^Ml)g=Fq
int temp; 1q}iUnR
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); tP"C>#LO
} zK k;&y|{
} k~`pV/6
} \uQ(-ji
B3c
rms['
} Cb x/
r*&gd