归并排序: 0+8e,
(h
`V+
package org.rut.util.algorithm.support; 1 -b_~DF
2&5K.Ui%
import org.rut.util.algorithm.SortUtil; GtHivC
R@2X3s:
/** %}T6]S)%u
* @author treeroot y)<q/
* @since 2006-2-2 [-x7_=E#
* @version 1.0 `H+lPM66
*/ 7[wPn`v2
public class MergeSort implements SortUtil.Sort{ Yr|4Fl~U
S|}L &A
/* (non-Javadoc) e:W{OIz:
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) d d;T-wa}
*/ 5LMw?P.<
public void sort(int[] data) { Q59W#e)
int[] temp=new int[data.length]; K>
e7pu
mergeSort(data,temp,0,data.length-1); &c #N)U
} 3gf1ownC
`$NP>%J-
private void mergeSort(int[] data,int[] temp,int l,int r){ b`_Q8 J
int mid=(l+r)/2; Y9|!+,
if(l==r) return ; #fM'>$N
mergeSort(data,temp,l,mid); wyG;8I
mergeSort(data,temp,mid+1,r); -F>jIgeC2v
for(int i=l;i<=r;i++){ :hA#m[
temp=data; wQLSf{2
} c[e}w+uB
int i1=l; BerwI
7!=
int i2=mid+1; D`AsRd
for(int cur=l;cur<=r;cur++){ L0]_X#s>#
if(i1==mid+1) ItCv.yv35
data[cur]=temp[i2++]; azU"G(6y?+
else if(i2>r) ?fS9J
data[cur]=temp[i1++]; =w^M{W.w
else if(temp[i1] data[cur]=temp[i1++]; B-ESFATc
else )}ROLe
data[cur]=temp[i2++]; 'f|o{
} 2+O'9F_v
} T
1t6p&
BORA(,
} },[}$m%
t:c.LFrF
改进后的归并排序: F5#YOck&,
~_ a-E
package org.rut.util.algorithm.support; r%N)bNk~
-{_PuJ "
import org.rut.util.algorithm.SortUtil; 1nOCQ\$l
Sx\]!B@DSu
/** O1kl70,`R
* @author treeroot { "E\Jcjl\
* @since 2006-2-2 GH
xp7H
* @version 1.0 9{uO1O\
*/ $7uA%|\
public class ImprovedMergeSort implements SortUtil.Sort { {_dvx*M
xwty<?dRW1
private static final int THRESHOLD = 10; RrgGEx
{BHO/q3
/* ]:\dPw`A
* (non-Javadoc) v.ui!|c
* E~:x(5'%d
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 1i] ^{;]
*/ Y4(
public void sort(int[] data) { ,?XCyHSgWW
int[] temp=new int[data.length]; 2Hv+W-6v
mergeSort(data,temp,0,data.length-1); ctJE+1#PH
} &t-kpA|EG
RX5dO%
private void mergeSort(int[] data, int[] temp, int l, int r) { e0 T\tc
int i, j, k; 4'Zp-k?5`
int mid = (l + r) / 2; zv"Z DRW
if (l == r) DFTyMB1H
return; k;L6R!V
if ((mid - l) >= THRESHOLD) +2j AC r
mergeSort(data, temp, l, mid); :/Qq@]O>
else @ry_nKr9
insertSort(data, l, mid - l + 1); +d;bjo 2
if ((r - mid) > THRESHOLD) >dG[G>
mergeSort(data, temp, mid + 1, r); O7IJ%_A&
else B93+BwN>95
insertSort(data, mid + 1, r - mid);
#C3.Jef
}>X~
for (i = l; i <= mid; i++) { i7>tU=
temp = data; 3%ZOKb"D*
} jalg5`PU0
for (j = 1; j <= r - mid; j++) { }Z,x~G
temp[r - j + 1] = data[j + mid]; "FKOaQ%IH
} (J!+(H8
int a = temp[l]; 1y4
int b = temp[r]; Ez=Olbk
for (i = l, j = r, k = l; k <= r; k++) { 8*T=Xei8
if (a < b) { :[!j?)%>
data[k] = temp[i++]; n=ux5M
a = temp; e@OX_t_
} else { (*)hD(C5
data[k] = temp[j--]; }!C)}.L<
b = temp[j]; tC9n
k5~
} igR";OQk
} /Mu@,)''
} Np0u,t%vs
#?9;uy<j.q
/** <HVt
V9R
* @param data P}7 'm
M
* @param l p"ZG%Ow5Q]
* @param i A=wh@"2
*/ ';=O 0)u
private void insertSort(int[] data, int start, int len) { %Q dn
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); [mGLcg6Fw
} nK%LRcAs
} "~C,bk
} 3x'|]Ns
[^98fAlz6
}