归并排序: 0#!}s&j/
]h(Iun
package org.rut.util.algorithm.support; Td'(RV
}RI_k&;
import org.rut.util.algorithm.SortUtil; rxu_Ssd@"
wGKxT
ap
/** "T5oUy&i
* @author treeroot k1f<(@*`
* @since 2006-2-2 cr{yy :D
* @version 1.0 4A6Y
\Z XI
*/ sA|SOAn
public class MergeSort implements SortUtil.Sort{ T :d+Qz\
xw
43P.
/* (non-Javadoc) R P<M
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ,#3Aaw
*/ RBn/7
public void sort(int[] data) {
h]ae^M
int[] temp=new int[data.length]; L,y
q=%h|
mergeSort(data,temp,0,data.length-1); 8xgBNQdPT
} jc
Mn
o?>0WSLlm
private void mergeSort(int[] data,int[] temp,int l,int r){ ]$r]GVeN}H
int mid=(l+r)/2; yVmp,""a
if(l==r) return ; aO&{.DO2
mergeSort(data,temp,l,mid); A_wf_.l4h
mergeSort(data,temp,mid+1,r); bHnKtaK4c
for(int i=l;i<=r;i++){ <m`CLVx8m
temp=data; /-[vC$B"
} iIX%%r+
int i1=l; r*vh3.Agl
int i2=mid+1; PKrG6%
W+
for(int cur=l;cur<=r;cur++){ 9u{[e"
if(i1==mid+1) &'W7-Z\j-
data[cur]=temp[i2++]; ?j.a>{
else if(i2>r) Q!@M/@-Ky
data[cur]=temp[i1++]; `mz}D76~#
else if(temp[i1] data[cur]=temp[i1++]; C?gqX0[ q
else HJ7A/XW
data[cur]=temp[i2++]; Yu_*P-Ja6
} J4::.r
} y,x 2f%x
MLHCBRi
} +?U[362>
<$z[pw<
改进后的归并排序: #C&';HB;y
s_NY#MPz[
package org.rut.util.algorithm.support; X1.-C@o
KqntOo}
y)
import org.rut.util.algorithm.SortUtil; @u9L+*F
?5nEmG|kO
/** [S,$E6&j$"
* @author treeroot |w|c!;,
* @since 2006-2-2 pS+w4gW
* @version 1.0 94#,dA,M
*/ ~F'6k&A^q
public class ImprovedMergeSort implements SortUtil.Sort { m_/Ut
?m]vk|>
private static final int THRESHOLD = 10; Dnw^H.
{. 9BG&
/* auK9wQ%\
* (non-Javadoc) /'jX_
V_$|
* + m-88
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) #ay/VlD@
*/ NgyEy n
\
public void sort(int[] data) {
QvZ"{
int[] temp=new int[data.length]; FJtmRPP[r
mergeSort(data,temp,0,data.length-1); U,i_}O3Q
} lu"0\}7X
I#(lxlp"Ho
private void mergeSort(int[] data, int[] temp, int l, int r) { Hvk~BP'
m
int i, j, k; !VWA4 e!+
int mid = (l + r) / 2; I~n4}}9M
if (l == r) . J O3#
return; 2.%)OC!q&5
if ((mid - l) >= THRESHOLD) tJ;qZyy(
mergeSort(data, temp, l, mid); MQwxQ{
else MygAmV&
insertSort(data, l, mid - l + 1); lg-_[!4Z
if ((r - mid) > THRESHOLD) _S
ng55s
mergeSort(data, temp, mid + 1, r); MN2i0!+
else /io06)-/n
insertSort(data, mid + 1, r - mid); N~$>| gn
5HOl~E
for (i = l; i <= mid; i++) { ZEI)U,
I.
temp = data; C5dM`_3L
} c%pf,sm'
for (j = 1; j <= r - mid; j++) { $~FZJ@qa
temp[r - j + 1] = data[j + mid]; Hj{.{V
} 8*0QVFn$
int a = temp[l]; Bp7p X
int b = temp[r]; Li5&^RAo|J
for (i = l, j = r, k = l; k <= r; k++) { .|[{$&B
if (a < b) { YgcW1}
data[k] = temp[i++]; :38{YCN
a = temp; d|RUxNjM-J
} else { *xNc^&.
data[k] = temp[j--]; wx3_?8z/O
b = temp[j]; h<%$?h+}
} b
VEJ
} %RV81H9B
} >b2!&dm
e1W9"&4>G{
/** ]`$yY5 &W0
* @param data h s',f
* @param l Zu|NF
uFI
* @param i J;_4
3eS
*/ AA=Ob$2$
private void insertSort(int[] data, int start, int len) { Vhv'Z\
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); Qz|T0\=V
} ~7ZZb*].(
} zG_n x3
} cQt&%SVT]E
~NK $rHwi%
}