归并排序: e$N1m:1*
l
9bg
package org.rut.util.algorithm.support; PBb'`PV
\OVw
import org.rut.util.algorithm.SortUtil; :~\ y<
p!7(ayu
/** S4D~`"4$/
* @author treeroot 8X)1bNGqhe
* @since 2006-2-2 ,lQfsntk'
* @version 1.0 cB_3~=fV
*/ 9
=D13s(C
public class MergeSort implements SortUtil.Sort{ 9d8U@=
fK NDl\SD
/* (non-Javadoc) N >k,"=N/
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) MrhJk
*/ Hh'o:j(^
public void sort(int[] data) { vPM2cc/o
int[] temp=new int[data.length]; -5Aqf\
mergeSort(data,temp,0,data.length-1); +t}<e(
} @ ]
3`S
LX7<+`aa
private void mergeSort(int[] data,int[] temp,int l,int r){ ZG)6{WS
int mid=(l+r)/2; ~QU\kZ7Z
if(l==r) return ; LsaRw-4.c
mergeSort(data,temp,l,mid); X;d 1@G
mergeSort(data,temp,mid+1,r); vg\fBHzn
for(int i=l;i<=r;i++){ oB%j3aAH
temp=data; M7c53fz
} .83z =
int i1=l; k@Bn}r
int i2=mid+1; #R#|hw
for(int cur=l;cur<=r;cur++){ 9iN}v
if(i1==mid+1) 2o1 RJk9
data[cur]=temp[i2++]; @pV&{Vp
else if(i2>r) jN{+$ @cI
data[cur]=temp[i1++]; zfK3$|
else if(temp[i1] data[cur]=temp[i1++]; 28O 3N;a
else 79Q>t%rD[
data[cur]=temp[i2++]; \&4)['4,
} G`NGt_C
} #.|MV}6rQ
!L@^Zgs|@?
} A2"$B\j1
yT h60U
改进后的归并排序: +?uZ~VSl
5mg] su
package org.rut.util.algorithm.support; O>>%lr|
2x:aMWh
import org.rut.util.algorithm.SortUtil; 9On(b|mT
ICUI0/J
/** ;w^{PZBg
* @author treeroot Z'_EX7r
* @since 2006-2-2 l%v2O'h
* @version 1.0 (z^987G
*/ J(k C
public class ImprovedMergeSort implements SortUtil.Sort { ZCDcf
e`;U9Z
private static final int THRESHOLD = 10; &I?d(Z=:\
5<Y-?23
/* %-3wR@
* (non-Javadoc) !\|L(Paf
* ;\gHFG}
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 9`5qVM1O{
*/ e'&<DE)
public void sort(int[] data) { Pql;5
~/
int[] temp=new int[data.length]; RaAvPIJa |
mergeSort(data,temp,0,data.length-1); 8~v E
} k[/`G5
v:u=.by99
private void mergeSort(int[] data, int[] temp, int l, int r) { ThYHVJ[;
int i, j, k; CChCxB
int mid = (l + r) / 2; +tp@Tb
if (l == r) pF'M
return; hlBqcOpkKg
if ((mid - l) >= THRESHOLD) )}4xmf@gl
mergeSort(data, temp, l, mid); 6q@VkzF
else AHdh]pfH
insertSort(data, l, mid - l + 1); z[De?8=)
if ((r - mid) > THRESHOLD) RyZy2^0<
mergeSort(data, temp, mid + 1, r); EALgBv>#ZL
else T<~?7-O"
insertSort(data, mid + 1, r - mid); )U:W
9%
<9aa@c57
for (i = l; i <= mid; i++) { CYN")J8V
temp = data; _rfGn,@BH
} 2qDVAq^@
for (j = 1; j <= r - mid; j++) { ( 2i{8
temp[r - j + 1] = data[j + mid]; Y1L7s H 9
} 0 A6%!h
int a = temp[l]; 7A4_b8
int b = temp[r]; K5:>
for (i = l, j = r, k = l; k <= r; k++) { .u&GbM%Ga
if (a < b) { IGcYPL\&
data[k] = temp[i++]; Un{ 9reX5
a = temp; @M8vPH
} else { [h~#5x
data[k] = temp[j--]; T|ZJ$E0
b = temp[j]; qb>mUS
} V.~C.x
} j$}W%ibj
} dnstm@0k
HbQ+:B]
/** #~:@H&f790
* @param data o :_'R5
* @param l
d/&~IR
* @param i SMbhJ}\O
*/ y<*/\]t9L[
private void insertSort(int[] data, int start, int len) { V"Y-|R
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); ^RE("'+
} 'U'Y[*m@
} }?=4pGsI
} T`SpIdzB.
D7OPFN7`
}