归并排序: }HQT@&=
Y,pS/
package org.rut.util.algorithm.support; Mb/6>
PJ11LE
import org.rut.util.algorithm.SortUtil; zH\;pmWiN9
j
n&9<"W
/** A@Yi{&D_Q]
* @author treeroot j
BQqpFH9
* @since 2006-2-2 gZ=9Y:$
* @version 1.0 C2,cyhr
*/ 0Eg r
Q
public class MergeSort implements SortUtil.Sort{ v%8-Al^G
;0X|*w1JO
/* (non-Javadoc) `zsk*W1GA
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) \3Ald.EqtM
*/ kA:;c}p
public void sort(int[] data) { L!8?2 \5
int[] temp=new int[data.length]; W2.1xNWO
mergeSort(data,temp,0,data.length-1); [,A'
} m"m;(T{ v
h}:5hi Jw
private void mergeSort(int[] data,int[] temp,int l,int r){ <n~g+ps
int mid=(l+r)/2; !VZCM{
if(l==r) return ; ZwrYss
mergeSort(data,temp,l,mid); u(G;57ms
mergeSort(data,temp,mid+1,r); N, +g/o\f
for(int i=l;i<=r;i++){ #1!BD!u
temp=data; |`D5XRVbi
} Q@.9wEAJ
int i1=l; czsoD)N
int i2=mid+1; SFPIr0 u
for(int cur=l;cur<=r;cur++){ ;@-5lCvC(+
if(i1==mid+1) /t 6u"I~
data[cur]=temp[i2++]; Hr,gV2n
else if(i2>r) =/'*(\C2
data[cur]=temp[i1++]; -8kW!F
else if(temp[i1] data[cur]=temp[i1++]; Eq.zCD8A
else nhxd
data[cur]=temp[i2++]; K[;,/:Y
} r_<i*l.
} /ykxVCvAt
{kO:HhUg
} J2k'Ke97o
j<-o{6r
改进后的归并排序: "N:]d*A\
V'h z1roe
package org.rut.util.algorithm.support; !<^j!'2
o>rlrqr?_
import org.rut.util.algorithm.SortUtil; aTL7"Myp
hahD.P<
/** k.R/X
* @author treeroot n[S*gX0
* @since 2006-2-2 .0;k|&eBD
* @version 1.0 _q4dgi z
*/ CbaAnm1
public class ImprovedMergeSort implements SortUtil.Sort { QMpA~x_m
(eIxU&o'
private static final int THRESHOLD = 10; Y0C<b*!"ST
"1 TM
/* qvE[_1QCc
* (non-Javadoc) ['`'&+x&!
* xfQ;5n
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) `ZV'7|
*/ {"AYOc>2|
public void sort(int[] data) { s+G9L)b'
int[] temp=new int[data.length]; /*2W?ZM~H
mergeSort(data,temp,0,data.length-1); q$*_C kT
} 8$tpPOhzb
sWzXl~JbF
private void mergeSort(int[] data, int[] temp, int l, int r) { KFG^vmrn
int i, j, k; e7AI&5Eg{
int mid = (l + r) / 2; Uy'ZL(2
if (l == r) " yl"A4p
S
return; 0~5}F^8[L
if ((mid - l) >= THRESHOLD) &I_!&m~
mergeSort(data, temp, l, mid); aL6 5t\2
else @9
tvN}
insertSort(data, l, mid - l + 1); I{UB!0H
if ((r - mid) > THRESHOLD) qGUe0(
mergeSort(data, temp, mid + 1, r); <.XoC?j
else h0QQP
insertSort(data, mid + 1, r - mid); AQGE(%X
&
b2(Y4
for (i = l; i <= mid; i++) { aVL%-Il}
temp = data; xH-k~#
} 4KB?g7_*
for (j = 1; j <= r - mid; j++) { Mo
r-$a8
temp[r - j + 1] = data[j + mid]; #`wfl9tj
} j-E>*N}-_
int a = temp[l]; D"aQbQP
int b = temp[r]; >(J!8*7
for (i = l, j = r, k = l; k <= r; k++) { WoR**J?}w
if (a < b) { 5 :>
data[k] = temp[i++]; 62E(=l
a = temp; I9&<:`
} else { G2k71{jK
data[k] = temp[j--]; 8j+;Xlh
b = temp[j]; 0n^j 50Yq
} J=bOw//
} WuXRL}!\,
} "2j~3aWj
vv_?ip:t
/** ozwqK oE
* @param data r/:'}os;
* @param l 01w/,r
* @param i $l"(tB7d
*/ Cagq0-:(p
private void insertSort(int[] data, int start, int len) { E&v-(0
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 82l";;n4p
} LM`#S/h
}
0$uS)J\;K
} f}d@G/L
+6E<+-N
}