HV/:OCK
h`1<+1J9
快速排序: S}%z0g<
E;C{i
package org.rut.util.algorithm.support; MU
a[}?
.06D_L"M
import org.rut.util.algorithm.SortUtil; G)}[!'<rR
]Rxo}A
/** QWfSm^
t
* @author treeroot q q&U)-`
* @since 2006-2-2 b}0h()v
* @version 1.0 ;Hk3y+&]a
*/ t
sUu
public class QuickSort implements SortUtil.Sort{ = N*Jis
Bgc]t
/* (non-Javadoc) 5<ruN11G
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 70 R6:
*/ 3jxC}xz)
public void sort(int[] data) { C&w0HoF
quickSort(data,0,data.length-1); #'s$6gT=
} [%dsq`b#
private void quickSort(int[] data,int i,int j){ m-
<y|3
int pivotIndex=(i+j)/2; m#RJRuZ|2V
//swap 23^>#b7st
SortUtil.swap(data,pivotIndex,j); 63u%=-T%a
|@JTSz*Or
int k=partition(data,i-1,j,data[j]); raPOF6-_rH
SortUtil.swap(data,k,j); /y-D_
if((k-i)>1) quickSort(data,i,k-1); R~oJ-}iYX
if((j-k)>1) quickSort(data,k+1,j); `3T=z{HR9g
f't.?M
} /)_4QSz7
/** =exCpW>
* @param data t(*n[7e
* @param i 6;'[v}O^^
* @param j =figat
* @return wCLniCt
*/ 2w7$"N
private int partition(int[] data, int l, int r,int pivot) { (t@)`N{
do{ u5}:[4N%I
while(data[++l] while((r!=0)&&data[--r]>pivot); ,ZJ}X 9$<
SortUtil.swap(data,l,r); jJiuq#;T3
} u9S*2'
while(l SortUtil.swap(data,l,r); Ljz)%y[s
return l; Pt5 wm\
} @9 S ::
9abUh3
} Bn&P@C$7
ct-Bq
改进后的快速排序: ZNw|5u^N
?`?Tg&W
package org.rut.util.algorithm.support; C:Rs~@tl
I(~([F2
import org.rut.util.algorithm.SortUtil; j_90iP^5:
O6y:e#0z
/** cF15Mm2
* @author treeroot - nNKUt.I
* @since 2006-2-2 <<d #
* @version 1.0 np^&cY]
*/ |"LHo
H
public class ImprovedQuickSort implements SortUtil.Sort { n}Z%D-b$
&{8:XJe*,%
private static int MAX_STACK_SIZE=4096; $||WI}k3V
private static int THRESHOLD=10; A` _dj}UF
/* (non-Javadoc) Jp"29
)w
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 2Ty]s~
*/ Nxe1^F33
public void sort(int[] data) { L-?ty@-i
int[] stack=new int[MAX_STACK_SIZE]; m^L !_~
%l&oRBC
int top=-1; 87! jn'A
int pivot; HQ"T>xb
int pivotIndex,l,r; D1y`J&A>Q
e+BZoK ^
stack[++top]=0; Rf4K Rhi
stack[++top]=data.length-1; _$$.5?4
y_L8i[
while(top>0){ 7#j.yf4
int j=stack[top--]; CJN~p]\
int i=stack[top--]; _(J#RH
%(
7##f_
pivotIndex=(i+j)/2; )I*(yUj
pivot=data[pivotIndex]; 5T.U=_ag
{?lndBP<
SortUtil.swap(data,pivotIndex,j); +:^l|6%}
I;JV-jDM
//partition A^).i_
l=i-1; &X:;B'
r=j; pdJ]V`m
do{ 0#TL$?=|
while(data[++l] while((r!=0)&&(data[--r]>pivot)); rtAPkXJFM
SortUtil.swap(data,l,r); R4 eu,,J
} X>`03?L
while(l SortUtil.swap(data,l,r); A"pQOtrm\k
SortUtil.swap(data,l,j); r}qDvC D
TOG4=y-N
if((l-i)>THRESHOLD){ sm'_0EUg
stack[++top]=i; ?l%4
P5
stack[++top]=l-1; AR( gI]1
} o#6QwbU25
if((j-l)>THRESHOLD){ P9
HKev?y
stack[++top]=l+1; nG4ZOx.*1g
stack[++top]=j; + Fo^NT
} !`N:.+DT
'|=Pw
} "XxmiK
//new InsertSort().sort(data); c6 &k?Puy
insertSort(data); N9|J\;fzT
} \{ | GK
/** fx+_;y
* @param data \h3HaNC
*/ .F$}a%
private void insertSort(int[] data) { %J2Ad
int temp; h[qZM
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); {<4?o?
1g
} *Ne2l`!1m
} JD`;,Md
} >@"3Q`
o\;"|O}
} ^^3va)1{!
ur,"K'w