归并排序: 0EP8MR SR
3qH`zYgh
package org.rut.util.algorithm.support; 3_k3U
N_8L8ds5
import org.rut.util.algorithm.SortUtil; [$GQ]Y
~f%AbDye
/** t!vlZNc
* @author treeroot o)6udRzBv
* @since 2006-2-2 8"S?
Toqq
* @version 1.0 evGUSol?:n
*/ ?"qS%EH
public class MergeSort implements SortUtil.Sort{ _^0)T@
s=|&NlO$
/* (non-Javadoc) 7wc{.~+
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Bcy$"F|r
*/
gIXc-=Ut
public void sort(int[] data) { A,#hYi=-,
int[] temp=new int[data.length]; zn{[]J
mergeSort(data,temp,0,data.length-1); Tn3f5ka'
} d
"vd_}P~
(wsvj61
private void mergeSort(int[] data,int[] temp,int l,int r){ mkmVDRK
int mid=(l+r)/2; Kx[z7]1@
if(l==r) return ; -[`FNTTV C
mergeSort(data,temp,l,mid); Aonq;} V e
mergeSort(data,temp,mid+1,r); Th//u I+
for(int i=l;i<=r;i++){ }tZA7),L
temp=data; >pl*2M&
} oE4hGt5x{
int i1=l; 7dU7cc
int i2=mid+1; 0=J69Yd
for(int cur=l;cur<=r;cur++){ U_,K_6vj
if(i1==mid+1) ;R?9|:7
data[cur]=temp[i2++]; |tS~\_O/
else if(i2>r) cB[.ET$
data[cur]=temp[i1++]; 4)nQBFX
else if(temp[i1] data[cur]=temp[i1++]; dQL!
>6a
else OG}D;Ew
data[cur]=temp[i2++]; QWGFXy,=1
} !bCLi>8
} &9'JHF!l
>(HUW^T/9z
} 9w FQ<r
KGX?\#-
改进后的归并排序: R OQIw
=<[ZFO~v
package org.rut.util.algorithm.support; &^YY>]1Py
KPA5 X]
import org.rut.util.algorithm.SortUtil; b511qc"i>M
57b;{kl
/** VI`x
fmVOQ
* @author treeroot way-Q7
* @since 2006-2-2 X_eV<]zA+
* @version 1.0 |"Oazll
*/ MPd#C*c
public class ImprovedMergeSort implements SortUtil.Sort { /_554q
Lsozl<@
private static final int THRESHOLD = 10; %rRpUrnm
yMa5?]J
/* ptuW}"F
* (non-Javadoc) :+,qvu!M7
* ),6Z1 K1
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) c$'UfW
*/ *WgP+"h
public void sort(int[] data) { &WHEP dD
int[] temp=new int[data.length]; 6%_d m'
mergeSort(data,temp,0,data.length-1); 0\U28zbMJw
} M$gy J!Pb
f i!wrvO
private void mergeSort(int[] data, int[] temp, int l, int r) { o&~z8/?LA
int i, j, k; wEMUr0Hq
int mid = (l + r) / 2; c(AjM9s
if (l == r) &4DV]9+g
return; h OboM3_
if ((mid - l) >= THRESHOLD) qwaw\vOA
mergeSort(data, temp, l, mid); 4p~:(U[q
else (<.1o_Q-LU
insertSort(data, l, mid - l + 1); +T^m
if ((r - mid) > THRESHOLD) WiviH#hF
mergeSort(data, temp, mid + 1, r); lv ^=g
else ?t}[Wi}7
insertSort(data, mid + 1, r - mid); TCF[iE{
uj/le0
for (i = l; i <= mid; i++) { ZcO!cR&*'J
temp = data; hoeTJ/;dm
} <ZrZSt+<
for (j = 1; j <= r - mid; j++) { +V8yv-/{
temp[r - j + 1] = data[j + mid]; t@v>eb
} }RUC#aW1
int a = temp[l]; nhCB])u8l
int b = temp[r]; IW1]H~1w
for (i = l, j = r, k = l; k <= r; k++) { ,?#-1uIGL>
if (a < b) { +dh]k=6
data[k] = temp[i++]; y_QxJ~6t
a = temp; 1=(i{D~
} else { |$b 4{
data[k] = temp[j--]; I(
y
Wct
b = temp[j]; ]-fZeyY$
} V`WfJ>{;Z
} y~S[0]y>
} s/To|9D
FJL9x,%6
/** sfrh+o57
* @param data 6y5arP*6e
* @param l {2:H`|x
* @param i %r!#
*/ |k+&weuY
private void insertSort(int[] data, int start, int len) { T8hQ< \g
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); >LU*F|F]B
} [bOy,^@4
} >PGm} s_
} kh,M'XbTo
w6"LHy[
}