hN_f h J
4,F3@m:<
快速排序: zIm_7\e
c(V=.+J
package org.rut.util.algorithm.support; Tq\~<rEo
d1TdH s\
import org.rut.util.algorithm.SortUtil; Jg|cvu-+
s\C8t0C
/** it\DZGsg
* @author treeroot D_n}p8blT
* @since 2006-2-2 o%WjJ~!zL
* @version 1.0 6(J4IzZ
*/ euj8p:+X
public class QuickSort implements SortUtil.Sort{ T<f\*1~^
pba8=Z
/* (non-Javadoc) 7.e7Fi{
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Vl 19Md
*/ 95^i/6Gl!P
public void sort(int[] data) { ZG@M%|>
quickSort(data,0,data.length-1); VwOG?5W/
} puS&S
*
private void quickSort(int[] data,int i,int j){ m
UWkb
int pivotIndex=(i+j)/2; hP1
l v7P
//swap B?#k W!wj
SortUtil.swap(data,pivotIndex,j); bKuj
po6
C3\E.u?
int k=partition(data,i-1,j,data[j]); "7yNKO;W
SortUtil.swap(data,k,j); [l':G ]
if((k-i)>1) quickSort(data,i,k-1); y5/'!L)g
if((j-k)>1) quickSort(data,k+1,j); `/w\2n
5Z9 ~
&U
} Z<ajET`)
/** K/2. 1o;9
* @param data {;&B^uz
]
* @param i UIf ZPf=
* @param j WfRfx#MMt
* @return S~k*r{?H})
*/ 6hM]%
private int partition(int[] data, int l, int r,int pivot) { hr[B^?6
do{ )W`SC mr]
while(data[++l] while((r!=0)&&data[--r]>pivot); ',JrY)
SortUtil.swap(data,l,r); 4N~+G `
} ,'C30 A*p
while(l SortUtil.swap(data,l,r); v.Xoq
return l; $Eio$TI
} _^ q\XPS
`s`C{|wv
} /}w#Jk4pD
y7JZKtsFA
改进后的快速排序: ?Ml%$z@b?
^Ue0mC7m
package org.rut.util.algorithm.support; H\fcY p6
JAlU%n?R
import org.rut.util.algorithm.SortUtil; U~*c#U"bh
iUI y,Y
/**
@8=vFP'
* @author treeroot &:c:9w
* @since 2006-2-2 wqlcLIJPR
* @version 1.0 IX<r5!
*/ ~^I\crx,U%
public class ImprovedQuickSort implements SortUtil.Sort { #M5_em4kN
i s L{9^
private static int MAX_STACK_SIZE=4096; {[2tG U9
private static int THRESHOLD=10; J]}FC{CD!
/* (non-Javadoc) 2yln7[a
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 6ORY`Pe7P|
*/ *me,(C
public void sort(int[] data) { xMDrE?
int[] stack=new int[MAX_STACK_SIZE]; LY-lTr@A^
}iilzE4oH#
int top=-1; "v(G7*2
int pivot; xfq]9<
int pivotIndex,l,r; F#(.v7Za
ch@x]@-;A3
stack[++top]=0; |JUe>E*
stack[++top]=data.length-1; tu\mFHvlg
%won=TG8
while(top>0){ LBiowd[
int j=stack[top--]; m|pTn#*`
int i=stack[top--]; YC]PN5[1!
mEoA#U
pivotIndex=(i+j)/2; UvkJ?Bu
pivot=data[pivotIndex]; 'nRp}s1^[
07x=`7hs}
SortUtil.swap(data,pivotIndex,j); j$@?62)6
[@m[V1D
//partition F`!TV(,bY
l=i-1; c[SU5 66y
r=j; N-[n\}'
do{ "JkZJ#
while(data[++l] while((r!=0)&&(data[--r]>pivot)); ZCm1+Y$
SortUtil.swap(data,l,r); 31~hlp;
} )`w=qCn1 Y
while(l SortUtil.swap(data,l,r); Zta$R,[9h
SortUtil.swap(data,l,j); I[#U`9Dt
ht?CHUu
if((l-i)>THRESHOLD){ I-xwJi9?,
stack[++top]=i; Kw)KA^KF
stack[++top]=l-1; D"L|"qJ
} cV-i*L4X
if((j-l)>THRESHOLD){ P7z:3o.
stack[++top]=l+1; -#Np7/
stack[++top]=j; I(pb-oY3!I
} ?>sQF4 V"
Dk6?Nwy"
} (nLKQV 1
//new InsertSort().sort(data); tG/aH% 4S
insertSort(data); \}Dpb%^\
} D%-{q>F!gf
/** Cz_AJ-WR
* @param data XE9)c
*/ <}d/v_+pnh
private void insertSort(int[] data) { sf`PV}a1
int temp; MRQZIi
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); M
Hg6PQIB
} huz86CO
} T?>E{1pS
} ! ,@ZQS
UxyY<H~Wx
} {VR`;
( :{"C6x