归并排序: Lnj5EY er
`rs1!ZJ,
package org.rut.util.algorithm.support; tPp}/a%D
+osY
iP5
import org.rut.util.algorithm.SortUtil; '.^JN@
1 9)78kV{
/** Q!|71{5U
* @author treeroot /
Sp+MB9
* @since 2006-2-2 -><_J4
* @version 1.0 ev+NKUi=
*/ #Io#OG<7b
public class MergeSort implements SortUtil.Sort{ ||_F
/AD
w{UU(
/* (non-Javadoc) (m,O!935f
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) i:zA(
*/ q?t>!1c
public void sort(int[] data) { 6zNN 8
int[] temp=new int[data.length]; h{TnvI/"
mergeSort(data,temp,0,data.length-1); h?CNChRJs
} t8^*s<O
F,EHZ,<V
private void mergeSort(int[] data,int[] temp,int l,int r){ 1-JWqV(#?
int mid=(l+r)/2; }Rf }
iG
if(l==r) return ; '7=*n_l
mergeSort(data,temp,l,mid); "<.b=mN-
mergeSort(data,temp,mid+1,r); dYO87n
for(int i=l;i<=r;i++){ uZ'5&k96T
temp=data; XM_S"
} h2tzv~
int i1=l; \zoJr)
int i2=mid+1; iu:e> r
for(int cur=l;cur<=r;cur++){ )lW<:?k
if(i1==mid+1) 8)H"w$jq
data[cur]=temp[i2++]; %R_8`4IQ
else if(i2>r) =|G PSRQ
data[cur]=temp[i1++]; 5N[Y2
else if(temp[i1] data[cur]=temp[i1++]; M.l;!U!}
else *'`-plS7
data[cur]=temp[i2++]; 3Yr
} e~}+.B0
}
\(A>~D8Fo
'i@Y #F%D
} Fm2t:,=
f.8L<<5 c
改进后的归并排序: @r
.K>+1
=Of#Ps)
package org.rut.util.algorithm.support; *J$=UG,u
%Ajf|Go0/G
import org.rut.util.algorithm.SortUtil; lc/2!:g
|X_yL3`Zb
/** t
Y^:C[
* @author treeroot ksK
lw_%o
* @since 2006-2-2 ).vdKNzw
* @version 1.0 !}vz_6)
*/ 'uPqe.#?
public class ImprovedMergeSort implements SortUtil.Sort { _mO\Nw0
?}Mv5SO
private static final int THRESHOLD = 10; 20Rgw
,qr)}s-
/* KT|$vw2b
* (non-Javadoc) cq!>B{
* D #A9
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) T8RQM1D_s
*/ 8m6L\Z&
public void sort(int[] data) { }SOj3.9{c
int[] temp=new int[data.length]; XCt}>/"s\h
mergeSort(data,temp,0,data.length-1); %b_zUFHPp
} f^]2qoN
bGSgph
private void mergeSort(int[] data, int[] temp, int l, int r) { _x>u"w
int i, j, k; /Ia#udkNMp
int mid = (l + r) / 2; U3Dy:K[
if (l == r) 3*'!,gK~[
return; lc'Jn$O@
if ((mid - l) >= THRESHOLD) }LE/{]A
mergeSort(data, temp, l, mid); y%T'e(5Ed
else 9> (8r+
insertSort(data, l, mid - l + 1); M2m@N-+R
if ((r - mid) > THRESHOLD) 4sva%Up
mergeSort(data, temp, mid + 1, r); WIbU^WJ0
else 7sFjO/a*
insertSort(data, mid + 1, r - mid); )X7ZX#ttH
mM95BUB
for (i = l; i <= mid; i++) { 1 8&^k|
temp = data; S]9xqiJW
} Q"(i
for (j = 1; j <= r - mid; j++) { yX)2
hj:s
temp[r - j + 1] = data[j + mid]; x2nNkd0h
} LS \4y&J40
int a = temp[l]; _Fer-nQ2R
int b = temp[r]; au#IA
for (i = l, j = r, k = l; k <= r; k++) { %f>V\z_C
if (a < b) { hio{: (
data[k] = temp[i++];
"? R$9i
a = temp; 6x.#K9@q4
} else { B,A/
-B\
data[k] = temp[j--]; ,iHl;3bu
b = temp[j]; MbJV)*Q
} /]vg_&)=
} 19lx;^b
} Dui<$jl0b
}t-{,0
/** uL1-@D,
* @param data D!y
Cnq=8
* @param l ]~|zY5i!
* @param i u'iOa
*/ /njN*rhx&Z
private void insertSort(int[] data, int start, int len) { \75%[;.
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); Q#vur o
} ~Ipl'cE
} :,cSEST
} `4$" mO>+
e0aeiG$/0
}