g[M]i6h2
ugno]5Ni
快速排序: [q'eENG
]3}feU+
package org.rut.util.algorithm.support; J==}QEhQ{
Rfht\{N 7
import org.rut.util.algorithm.SortUtil; [eyb7\#
R;r|cep
/** u*hH}
* @author treeroot Jz0K}^Dj[
* @since 2006-2-2 Mq@}snp"S
* @version 1.0 S/VA~,KCe;
*/ :<|Z.4}kJb
public class QuickSort implements SortUtil.Sort{ H<,bq*@
)S2iIi;Bq
/* (non-Javadoc) F99A;M8(
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) !3h{lEB
*/ Tv\HAK<N
public void sort(int[] data) { iX{H,-C
quickSort(data,0,data.length-1); zj{(p Z1
} FuuS"G,S
private void quickSort(int[] data,int i,int j){ `y2ljIWJ
int pivotIndex=(i+j)/2; gKWzFnW
//swap VG)="g[%)
SortUtil.swap(data,pivotIndex,j); G,]z(%
.Vmtx
int k=partition(data,i-1,j,data[j]); a%E8(ms37y
SortUtil.swap(data,k,j); HyEa_9
if((k-i)>1) quickSort(data,i,k-1); 6 Uw;C84!
if((j-k)>1) quickSort(data,k+1,j); ")ED)&e
0R|K0XH#$
} V\AK6U@r^
/** b/nOdFO@
* @param data lUHtjr
* @param i yp p 4L|R
* @param j b66R}=P l
* @return 0wFh%/:
*/ A*F9\mjI5
private int partition(int[] data, int l, int r,int pivot) { j=W@P-
do{ WYLX?x
while(data[++l] while((r!=0)&&data[--r]>pivot); .E$q&7@/j
SortUtil.swap(data,l,r); (;UP%H>
} C_G1P)k
while(l SortUtil.swap(data,l,r); YBvd
q1
return l; _R74/|
} 3] ^'
6e#wR/
} '#H")i
;Iq5|rzDn
改进后的快速排序: uNbIX:L,
dE [Ol
package org.rut.util.algorithm.support; wAh#
Q]#Z9 H
import org.rut.util.algorithm.SortUtil; .S_QQM}Q
7/"@yVBW
/** tOH0IE c
* @author treeroot ([KN*OF
* @since 2006-2-2 A(+:S"|@
* @version 1.0 }g{_AiP
rv
*/ )%VCzye*{
public class ImprovedQuickSort implements SortUtil.Sort { lKWr=k~
S}cF0B1E*
private static int MAX_STACK_SIZE=4096; v[&'k\
private static int THRESHOLD=10; sPCMckt
/* (non-Javadoc) |I^y0Q:K
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) yM ,VrUh
*/ C:GvP>
public void sort(int[] data) { Y<Q\d[3^F
int[] stack=new int[MAX_STACK_SIZE]; cZi[(K
h8=h >W-
int top=-1; 4ht\&2&:
int pivot; ?"j@;/=
int pivotIndex,l,r;
$Nu)E
?9e]
stack[++top]=0; l1<?ONB.#
stack[++top]=data.length-1; m r4b
2Va4i7"X\
while(top>0){ r)b<{u=]
int j=stack[top--]; ~NNv>5t5
int i=stack[top--]; f&yQhe6 q
kCA5|u
pivotIndex=(i+j)/2; <AUWby,"
pivot=data[pivotIndex]; Ei~f`{i
<Tx C!{<
SortUtil.swap(data,pivotIndex,j); Y=Hz;Ni
HmV />9
//partition
p5<2N
l=i-1; r7I
B{}>-
r=j; s'L?;:)dyB
do{ B*,?C]0{
while(data[++l] while((r!=0)&&(data[--r]>pivot)); HarFE4V
SortUtil.swap(data,l,r); Zq*eX\#C
} &1GUi{I
while(l SortUtil.swap(data,l,r); cOku1g8
SortUtil.swap(data,l,j); ]W)
jmw'mo
VJ{pN ~_1
if((l-i)>THRESHOLD){ 5 =Z!hQ}
stack[++top]=i; g:gB`8w?
stack[++top]=l-1; 6fwY$K\X
} jO)&KEh
if((j-l)>THRESHOLD){ &U&%ka<*
stack[++top]=l+1; f=I:DkR
stack[++top]=j; $(q8y/,R*-
} _N'75
vv/J 5#^,\
} ,
Oli
//new InsertSort().sort(data); 8QF`,oXQO
insertSort(data); G|9B)`S
} e|'N(D}h*
/** 8A{6j
* @param data .nZ3kT`
*/ _;e\:7<m
private void insertSort(int[] data) { C6@t
int temp; #Lka+l;L7
for(int i=1;i for(int j=i;(j>0)&&(data[j] SortUtil.swap(data,j,j-1); \*"`L3
} kh?. K#
} 'b[0ci:
} ^7u#30,}3~
fLB1)kTS
} .3wY\W8Dr-
H_B~P%E@]