Q)%a2s;
'E_~>
快速排序: p)YI8nW
_2wH4^Vb
package org.rut.util.algorithm.support; Cw,;>>Y_b<
.NRSBk
import org.rut.util.algorithm.SortUtil; nv}z%.rRUj
+H6cZ,
/** rpMjDjW
* @author treeroot /~}<[6ZGCY
* @since 2006-2-2 mj|TWDcj+
* @version 1.0 <}n"gk1is
*/ \\v1\
public class QuickSort implements SortUtil.Sort{ vQsI^p
z z2'h>
/* (non-Javadoc) WOR H4h9
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) wpV)y Q^
*/ v i~NfD@s
public void sort(int[] data) { ~F^7L5d}C
quickSort(data,0,data.length-1); BaXf=RsZ
} =P7!6V\f
private void quickSort(int[] data,int i,int j){ [;, Xp/
int pivotIndex=(i+j)/2; gkMyo`
//swap /4%ycr6
SortUtil.swap(data,pivotIndex,j); @zq]vX-A_
Mcm%G#
int k=partition(data,i-1,j,data[j]); Q%.F Mf
SortUtil.swap(data,k,j); rlP?Uh
if((k-i)>1) quickSort(data,i,k-1); H?$gHZPI
if((j-k)>1) quickSort(data,k+1,j); (GB*+@
:7 OhplI
} Rt3/dw(p
/** "C'T>^qw*
* @param data u3])_oj=
* @param i ~=i<O&nai
* @param j jPA^SxM
* @return "fZWAGDBO\
*/ `R@b`3*%v
private int partition(int[] data, int l, int r,int pivot) { aZB$%#'vR
do{ o@W:PmKW
while(data[++l] while((r!=0)&&data[--r]>pivot); ^rssZQKY[
SortUtil.swap(data,l,r); ,!Q^"aOT:
} j@C*kj;-
while(l SortUtil.swap(data,l,r); ^J?y
mo$>0
return l; Z;[f,Oj
} F,/yK-9
%(i(Cf8@
} 1 TA\6a}
1`v$R0`!
改进后的快速排序: fYUbr"Oe
I`4k5KB;
package org.rut.util.algorithm.support; m'YYkq(5%Z
B0dv_'L}L
import org.rut.util.algorithm.SortUtil; X(dHhO
&)GlLpaT
/** b|E1>TkY
* @author treeroot EU4j'1!&g<
* @since 2006-2-2 o*Kl`3=]
* @version 1.0 XO,gEn&6V
*/ tA {?-5
public class ImprovedQuickSort implements SortUtil.Sort { tr-muhuK
7?a!x$-U(
private static int MAX_STACK_SIZE=4096; gSt'<v
private static int THRESHOLD=10; X].Igb)2
/* (non-Javadoc) 3U&rK)F
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Bl*.N9*
*/ m 7/b.B}
public void sort(int[] data) { ^;mnP=`l[
int[] stack=new int[MAX_STACK_SIZE]; mt*/%>@7R
G[ gfD\
int top=-1; Zt"3g6S
int pivot; YT\.${N
int pivotIndex,l,r; r"W,G/;h
aa,^+^J
stack[++top]=0; ^zVW 3Y q
stack[++top]=data.length-1; >v1ajI>O&{
idSc#n22
while(top>0){ ;`:A(yN]T
int j=stack[top--]; /`VrV{\/!
int i=stack[top--]; KvkU]s_
A_}6J,*u
pivotIndex=(i+j)/2; 0S$6j-"
pivot=data[pivotIndex]; {<L|Z=&k`
'/
*;g#W=
SortUtil.swap(data,pivotIndex,j); x}X
hL
$Eh:m&hq
//partition -cL wjI
l=i-1; L2{b~`UvP
r=j; <g'0q*qE
do{ x{I,
gu|+
while(data[++l] while((r!=0)&&(data[--r]>pivot)); ZZJ<JdD
SortUtil.swap(data,l,r); .kZ<Q]Vk
} -PLh|
while(l SortUtil.swap(data,l,r); MHF7hk ps}
SortUtil.swap(data,l,j); r
l>e~i
F%`O$uXA
if((l-i)>THRESHOLD){ TDZ p1zpXb
stack[++top]=i; DA9f\q
stack[++top]=l-1; 26[m7\O
} JYO("f
if((j-l)>THRESHOLD){ :BpXi|n;
stack[++top]=l+1; }E&48$0h
stack[++top]=j; MVOWJaT(Aq
} -i*]Sgese
/j;HM[
} erdA?
//new InsertSort().sort(data); #v}pn2g%>
insertSort(data); +5qY*$dn
} EVW\Z 2N.
/** 2b^E8+r9
* @param data ">x"BP
*/ JE ''Th}
private void insertSort(int[] data) { E4qQ
int temp; b3l~wp6>
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); 8;5@5Au
} 'A)9h7k}
} LQXMGgp
} yL"UBe}v
+!eh\.u|]
} ;kR+jC(
U_<k*o@: