归并排序: {
?1mY"
9-e[S3ziM
package org.rut.util.algorithm.support; OD2ai]!v+
bx%hizb
import org.rut.util.algorithm.SortUtil; |]
f"j':
&t=>:C$1Y
/** 1V?Sj
* @author treeroot Vzv.e6_
* @since 2006-2-2 QYCNO#*
* @version 1.0 |SXMu_w
*/ N_WA4?rB
public class MergeSort implements SortUtil.Sort{ b~jvmcr
h-v&I>
/* (non-Javadoc) ![."xHVeL
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) wx?{|
*/ 7>e~i,
public void sort(int[] data) { [HZCnO|N
int[] temp=new int[data.length]; DF&jZ[##
mergeSort(data,temp,0,data.length-1); 3B_} :
} *R~(:z>>
JNz"lTt>[g
private void mergeSort(int[] data,int[] temp,int l,int r){ ez<wEtS
int mid=(l+r)/2; o3[sF
if(l==r) return ; R`3>0LrC8
mergeSort(data,temp,l,mid); J?=Ob?+
_
mergeSort(data,temp,mid+1,r); QCY{D@7T
for(int i=l;i<=r;i++){ NS/L! "g
temp=data; 5FR#_}k]_F
} d/99!+r
int i1=l; an5kR_=
int i2=mid+1; aFm]?75
for(int cur=l;cur<=r;cur++){ es(LE/`e
if(i1==mid+1) ?b' '
data[cur]=temp[i2++]; u0H`%m
else if(i2>r) /gy:#-2Gy
data[cur]=temp[i1++]; >wm$,%zk
else if(temp[i1] data[cur]=temp[i1++]; 4uVmhjT:X
else Rw^YTv
data[cur]=temp[i2++]; 21EUP6}8j
} i&G`ah>
} JfINAaboi
s3RyLT
} 9}Ave:X^
"RX5] eJc\
改进后的归并排序: 3a[(GW _
ik NFW*p
package org.rut.util.algorithm.support; |0!97*H5
`hf9rjy4
import org.rut.util.algorithm.SortUtil; (_5+`YsV
;{7lc9uRj
/** y#0Z[[I0
* @author treeroot '\YhRU
* @since 2006-2-2 %}5"5\Zz
* @version 1.0 Q+M3Pqy
*/ &Gwh<%=U
public class ImprovedMergeSort implements SortUtil.Sort { KgAX0dM
#zD+DBTAu
private static final int THRESHOLD = 10; !D5`8
Sf:lN4
/* zO]dQ$r\Z
* (non-Javadoc) K'/x9.'%
* 6oBt<r?CJ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) s'=]a-l~
*/ *,*5sV
public void sort(int[] data) { g*AqFY7|
int[] temp=new int[data.length]; "G)?
E|
mergeSort(data,temp,0,data.length-1); *Yjs$'_2
}
6)j4
TH
0].5[Jo
private void mergeSort(int[] data, int[] temp, int l, int r) { 8rNxd=!
int i, j, k; #(4hX6?5AI
int mid = (l + r) / 2; CI{TgL:l
if (l == r) .}>[Kr
return; /bk} J:QRg
if ((mid - l) >= THRESHOLD) t!N>0]:mo
mergeSort(data, temp, l, mid); NtL?cWct
else H9[.#+ln
insertSort(data, l, mid - l + 1); cIkLdh
if ((r - mid) > THRESHOLD) 46`{mPd{aO
mergeSort(data, temp, mid + 1, r); (dZ&Af
else
fE}}>
insertSort(data, mid + 1, r - mid); K)Ka"H
~vS.D r
for (i = l; i <= mid; i++) { @#">~P|Hp
temp = data; uBJF}"4ej
} A;PV,2|X
for (j = 1; j <= r - mid; j++) { 2US8<sq+
temp[r - j + 1] = data[j + mid]; ~8E
rl3=5{
} tO$M[P=b
int a = temp[l]; =!aV?kNS8
int b = temp[r]; 4Qs#ws])
for (i = l, j = r, k = l; k <= r; k++) { [rem,i+
if (a < b) { C5FtJquGN)
data[k] = temp[i++]; fN;y\!q5
a = temp; \!Pm^FD
.
} else { T8 k o P
data[k] = temp[j--]; NU"X*g-x^
b = temp[j]; MI 3_<[
} QBg'VV
} E O^0sF<
} 0jq#,p=l;
_Yv9u'q"
/** ~$<@:z{*
* @param data (;0]V+-
* @param l H>?@nYP
* @param i QaV*}W
*/ l!2.)F` x
private void insertSort(int[] data, int start, int len) { 3/D fsv
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); pVM;xxJ
} a?dM8zAnc
} Uz6B\-(0p
} 6gn|WO=Wf
hsh
W5j
}