归并排序: /YZr~|65
$GlWf
package org.rut.util.algorithm.support; -r-k_6QP
!o:f$6EA~C
import org.rut.util.algorithm.SortUtil; &YF^j2
e" St_z(
/** <YdE1{fm
* @author treeroot _lamn}(x0
* @since 2006-2-2 ILGMMA_2
* @version 1.0 |Y?HA&
*/ .&DhN#EN0
public class MergeSort implements SortUtil.Sort{ r"P|dlV-
Tj:B!>>
/* (non-Javadoc) 3B84^>U<
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) '.:z&gSqx0
*/ 8fl`r~bqZ
public void sort(int[] data) { A"L&a
l$i
int[] temp=new int[data.length]; I}1NB3>^
mergeSort(data,temp,0,data.length-1); Tf'hc]`vS
} f&Gt|
<g"{Wv: h
private void mergeSort(int[] data,int[] temp,int l,int r){ vSEuk}pk
int mid=(l+r)/2; U|jSa,}
if(l==r) return ; 8X[:j&@
mergeSort(data,temp,l,mid); \W~N
mergeSort(data,temp,mid+1,r); E|iQc8gr&
for(int i=l;i<=r;i++){ 'uBu6G
temp=data; N sXHO
} 8WXQOo8
int i1=l; MN\HDKN
int i2=mid+1; >T^;MS
for(int cur=l;cur<=r;cur++){ =l+yA>t|
if(i1==mid+1) [_k1jHr48N
data[cur]=temp[i2++]; pH9VTM.*
else if(i2>r) \NPmym_6J
data[cur]=temp[i1++]; `sn^ysp
else if(temp[i1] data[cur]=temp[i1++]; 4h|c<-`>t
else pR=@S>!|
data[cur]=temp[i2++]; Z?h~{Mg
} R!}H;[c
} 6^]+[q}3
T&6l$1J
} F3On?x)
u_oaebOrpP
改进后的归并排序: k\5c|Wq|g
~%<X0s|
package org.rut.util.algorithm.support; 9jM}~XvV
H\ F:95
import org.rut.util.algorithm.SortUtil; Lt64JH^lz
<:+ x+4ru
/** 5?{r
* @author treeroot +^60T$
* @since 2006-2-2 TM%|'^)
* @version 1.0 ]cHgleHQ
*/ >g1~CEMN#
public class ImprovedMergeSort implements SortUtil.Sort { q'T4w!V(V
>mwlsL~X
private static final int THRESHOLD = 10; e"{{ TcNk
hOjk3
k
/* j#!IuH\]
* (non-Javadoc) cr7 }^s
* _kef0K6
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ]L5@,E4.
*/ =^M/{51j
public void sort(int[] data) { J,'M4O\S
int[] temp=new int[data.length]; 'j#*6xD
mergeSort(data,temp,0,data.length-1); A8muQuj]~~
} , qMzWa
fK>L!=Q
private void mergeSort(int[] data, int[] temp, int l, int r) { 9+Np4i@
int i, j, k; Cio
1E-4
int mid = (l + r) / 2; R@1 xt@?
if (l == r) luh$2 \5B
return; }T(D7|^R
if ((mid - l) >= THRESHOLD) UXJeAE-
mergeSort(data, temp, l, mid); &*M!lxDN
else "q3ZWNS'w
insertSort(data, l, mid - l + 1); K@
I9^b
if ((r - mid) > THRESHOLD) ha]VWt%}
mergeSort(data, temp, mid + 1, r); f\|w'
else n@<YI
insertSort(data, mid + 1, r - mid); }|h# \$w
Ua:}V n&!
for (i = l; i <= mid; i++) { I fK,b*%
temp = data; ?+))}J5N\
} YL!P0o13r
for (j = 1; j <= r - mid; j++) { g];!&R-
temp[r - j + 1] = data[j + mid]; p_RsU`[
} Wf+cDpK
int a = temp[l]; $0W|26;
int b = temp[r]; g2+2%6m0
for (i = l, j = r, k = l; k <= r; k++) { n1Yp1"2b[
if (a < b) { z O-z%y
data[k] = temp[i++]; Ouk^O}W6
a = temp;
Vr3Zu{&2
} else { KjD/o?JUr
data[k] = temp[j--]; "Wct({n
b = temp[j]; ?g_3 [Fk
} W: z6Koc0
} =Qy<GeY
} Xr,1&"B&t
G<L;4nA)
/** yuh *
* @param data ik)|{%!K]H
* @param l X]ipI$'+C
* @param i x+\`gK5
*/ 2=*H 8'k
private void insertSort(int[] data, int start, int len) { OAgniLv
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 9)l$ aBa
} hZm"t/aKc
} tHU 2/V:R
} U7?;UCmX
#]\Uk,mhZB
}