归并排序: 2z-&Ya Qu
{6KU.'#iF
package org.rut.util.algorithm.support; (V+(\<M
w
S;(u[W
import org.rut.util.algorithm.SortUtil; |{_%YM($
5]F9o9]T
/** PC3wzJ\\S
* @author treeroot #AY+[+
* @since 2006-2-2 kTnvD|3_!P
* @version 1.0 wF&\@H
*/ !.F\v.
public class MergeSort implements SortUtil.Sort{ Pq`4Y
K
m t*v@'l.
/* (non-Javadoc) $4L=Dg
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Q;Oc#
u
*/ 8ZahpB
public void sort(int[] data) { iCc\p2p
int[] temp=new int[data.length]; *JDc1$H0
mergeSort(data,temp,0,data.length-1); 2/bck)p=
} L72GF5+!!
kQ:2 @SOm
private void mergeSort(int[] data,int[] temp,int l,int r){ }??q{B@v
int mid=(l+r)/2; u}$U|Cw-;T
if(l==r) return ; p;B
+g X
mergeSort(data,temp,l,mid); jLEU V
mergeSort(data,temp,mid+1,r); g_}@/5?y
for(int i=l;i<=r;i++){ G3e%~
temp=data; ^ZV xBQKg
} :q= XE$%H
int i1=l; FTB"C[>
int i2=mid+1; lF#Kg!-l
for(int cur=l;cur<=r;cur++){ ;or> Sh7
if(i1==mid+1) !X,S2-}"
data[cur]=temp[i2++]; .a^/r'?
else if(i2>r) -Pvt+I>
data[cur]=temp[i1++]; {=(4
else if(temp[i1] data[cur]=temp[i1++]; A,iXiDb3pK
else w}E?FEe.
data[cur]=temp[i2++]; 1] kk
} w%$n)7<*
} m+!%+S1
x^;nfqn|
} JD>!3>S)?
|W::\yu6
改进后的归并排序: 2L\h+)
{vU '>pp
package org.rut.util.algorithm.support; ?W|POk}
1ri#hm0x\
import org.rut.util.algorithm.SortUtil; NR3IeTd
Psv-y
/** ZuE0'9
* @author treeroot 2ru6bIb;
* @since 2006-2-2 Eod2vr=Q
* @version 1.0 :_^YEm+A
*/ ,`wxXU7
public class ImprovedMergeSort implements SortUtil.Sort { -Wig k['v
>B9rr0d0
private static final int THRESHOLD = 10; N7e^XUG
?K]k(ZV_+Y
/* vXf#gX!Y
* (non-Javadoc) .5T7O_%FP
* X(1.Hjh
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) _l Jj 6=
*/ WRnUF[y+)
public void sort(int[] data) { BE U[M
int[] temp=new int[data.length]; >y=%o~
mergeSort(data,temp,0,data.length-1); w8on3f;6n#
} 712i|
O-|3k$'\z
private void mergeSort(int[] data, int[] temp, int l, int r) { ~q9RZ#g13J
int i, j, k; m760K*:i\
int mid = (l + r) / 2; T&h|sa(
if (l == r) 'R$~U?i8
return; FqiK}K.~/
if ((mid - l) >= THRESHOLD) jVA xa|S
mergeSort(data, temp, l, mid); <ImeZ'L7
else 4SOj>(a#
insertSort(data, l, mid - l + 1); <&NR3^Eq
if ((r - mid) > THRESHOLD) S !e0:
mergeSort(data, temp, mid + 1, r); qlzL<
else K[9 <a>D`
insertSort(data, mid + 1, r - mid); {<i!Pm
?@XO*|xkSk
for (i = l; i <= mid; i++) { *7Mrng
temp = data; II2oV}7?
} (O&b:D/Y
for (j = 1; j <= r - mid; j++) { ;uJVY)7a
temp[r - j + 1] = data[j + mid]; \GkcK$Y
} 6ZM<M7(V
int a = temp[l]; @3G3l|~>
int b = temp[r]; W}e5 4-lu
for (i = l, j = r, k = l; k <= r; k++) { fpqKa r
if (a < b) { D/)xe:
data[k] = temp[i++]; ,5/gNg
a = temp; \gzNMI*
} else { H@6
data[k] = temp[j--]; eD/?$@y
b = temp[j]; EEaFi8
} |GsLcUv6
} Qejzp/2
} Rw7Q[I5z%
w?R6$n`
/** H<>x_}&
* @param data ZE1#{u~[y
* @param l Gh< r_O~L3
* @param i W[vak F
*/ LPXwfEHOm
private void insertSort(int[] data, int start, int len) { f&,.h"bS
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); [m4<j
} f{vnZ|WD
} 4f>Vg$4
} QTDI^ZeuF
@Wv*`
}