ll<NIdf\r
W?Xiz TW
快速排序: 1*Ar{:+ua
`G$1n#&
package org.rut.util.algorithm.support; Q@QFV~
s;1h-Oq(
import org.rut.util.algorithm.SortUtil; :&w{\-0{
jbte
*Ae
/** n$["z
w
* @author treeroot %y<]Yzv.
* @since 2006-2-2 jirbUl
* @version 1.0 glUo7^ay7
*/ nH[+n `{o
public class QuickSort implements SortUtil.Sort{ ux-CpI
Ee2c5C!|C
/* (non-Javadoc) u8vuwbra!
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) z@VP:au
*/ L,]=vba'$
public void sort(int[] data) { Tg
?x3?kw
quickSort(data,0,data.length-1); f CcD&<%
} aT!;{+
private void quickSort(int[] data,int i,int j){ hOk00az
int pivotIndex=(i+j)/2; ,mFsM!|
//swap csQfic
SortUtil.swap(data,pivotIndex,j); xWX*tJ4
eon!CE0
int k=partition(data,i-1,j,data[j]); b ,^*mx=
SortUtil.swap(data,k,j); ;<wS+4,
if((k-i)>1) quickSort(data,i,k-1); mpay^.(%
if((j-k)>1) quickSort(data,k+1,j); Q^_/By@
C"w
{\
&R
} Ru\_dr2yI}
/** kQv*eZ~
* @param data !Pj/7JC0
* @param i }1H=wg>\
* @param j xUWr}j4;
* @return &KC!*}<tx
*/ XcfKx@l
private int partition(int[] data, int l, int r,int pivot) { z2yJ#
do{ M>H=z#C>/A
while(data[++l] while((r!=0)&&data[--r]>pivot); my.`k'
SortUtil.swap(data,l,r); 5OP`c<
} lWZuXb,G
while(l SortUtil.swap(data,l,r); #D%ygh=
return l; *cv}*D
} !1sU>Xb4J
.ln8|;%
} Iy7pt~DJ,
k(s;,B\
改进后的快速排序: O8u3y
SU%DW 46
package org.rut.util.algorithm.support; UlovXb
G*}F5.>8(
import org.rut.util.algorithm.SortUtil; saZ>?Owz
>_ \<E!j
/** LMl~yqM
* @author treeroot =y]$0nh
* @since 2006-2-2 &%C4Ugo
* @version 1.0 z; }6f
*/ wz
/GB8P
public class ImprovedQuickSort implements SortUtil.Sort { P=8>c'Q
F?4(5 K
private static int MAX_STACK_SIZE=4096; kCP$I732
private static int THRESHOLD=10; m
<k!^jp
/* (non-Javadoc) RDQ^dui
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 6f%DpJ:$U
*/ RMXzU
public void sort(int[] data) { yJJ4~j){l
int[] stack=new int[MAX_STACK_SIZE]; EeQ5vqU
yJ2B3i@T4
int top=-1; 4&X*pL2;
int pivot; dZ(|uC!?
int pivotIndex,l,r; 4dh+
Ca>&
stack[++top]=0; vK'?:}~
stack[++top]=data.length-1; LXfCmc9|Z
0tz:Wd*<
while(top>0){ K%g;NW
int j=stack[top--]; nKh&-E
int i=stack[top--]; }At{'8*n
fnu"*5bE
pivotIndex=(i+j)/2; DPDe>3Mi[
pivot=data[pivotIndex]; lPP,`
.0y%5wz8j
SortUtil.swap(data,pivotIndex,j); `S/wJ'c
r.3KPiYK
//partition /.Jb0h[W1
l=i-1; *,WP,-0
r=j; gUax'^w;V;
do{ U8QX46Br
while(data[++l] while((r!=0)&&(data[--r]>pivot)); CnF |LTi
SortUtil.swap(data,l,r); iU2KEqCm
} LLAa1Wq
while(l SortUtil.swap(data,l,r);
~=n#}{/
SortUtil.swap(data,l,j); pK&I^r
D&:yMp(
if((l-i)>THRESHOLD){ o4^Fo p
stack[++top]=i; @e2}BhB2
stack[++top]=l-1; x^= M6;:
} &<x@1,
if((j-l)>THRESHOLD){ Ukphd$3J=
stack[++top]=l+1; qN|
fEO>
stack[++top]=j; VHUW]8We
} C;B}3g&
Xa9TS"
} \c`oy=qY0
//new InsertSort().sort(data); \}]iS C.2
insertSort(data); 2&(sa0*y
} ?/#}ZZK^
/** quu*xJ;Ci
* @param data \+PIe7f_
*/ BN_7Ay/k
private void insertSort(int[] data) { 5i So8*9}
int temp; (Ye>Cp+]
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); jx`QB')kX
} 3K0tC=
} `iShJz96
} JC;^--0(z
u' Qd,
} U yqXMbw@
B5am1y{P#