归并排序: ~--F?KUnL
:Kk+wp}f#
package org.rut.util.algorithm.support; h4=7{0[
i:x<Vi
import org.rut.util.algorithm.SortUtil; Og2G0sWRf
~U1M-<IX
/** kD#hfYs)i
* @author treeroot ML:H\
* @since 2006-2-2 R'h.lX
* @version 1.0 B0m2SUC,H
*/ +}Qq#^:_\
public class MergeSort implements SortUtil.Sort{ A<[BR*n
P5`BrY,hZ
/* (non-Javadoc) K#[z5
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) a+P^?N
*/ !z"nJC
public void sort(int[] data) { 3EA`]&d>
int[] temp=new int[data.length]; >?r8D48`
mergeSort(data,temp,0,data.length-1); %B04|Q
} C |P(,Xp
hGj`IAW
private void mergeSort(int[] data,int[] temp,int l,int r){ P@8S|#LpZ
int mid=(l+r)/2; C$^WW}S
if(l==r) return ; PbY=?>0 z
mergeSort(data,temp,l,mid); n*A"}i`ix
mergeSort(data,temp,mid+1,r); ~~{+?v6B]
for(int i=l;i<=r;i++){ H*h4D+Kxv
temp=data; -H"^;37T"
} {hBnEj^@
int i1=l; j&Y{
CFuZ
int i2=mid+1; @hOT<
Uo
for(int cur=l;cur<=r;cur++){ `0Xs!f
if(i1==mid+1) AqjEz+TVt
data[cur]=temp[i2++]; SaiYdJ
else if(i2>r) JVh/<A
data[cur]=temp[i1++]; _y Q*
else if(temp[i1] data[cur]=temp[i1++]; $:I~y|
!1
else |Uz?i7z
data[cur]=temp[i2++]; g{&a|NU^
} ,nqG*
o
} &j}\ZD
bP%0T++vo
} tcYbM+4e
wv>uT{g#
改进后的归并排序: #t
/.fd
v~>^c1:
package org.rut.util.algorithm.support; >W,1s
H
R$\jJ
import org.rut.util.algorithm.SortUtil; ' bio:1
Fx']kn9
/** )--v>*,V
* @author treeroot RsJj*REO
* @since 2006-2-2 Zfyr&]"
* @version 1.0 Yr@)W~
*/ xXl^\?HC
public class ImprovedMergeSort implements SortUtil.Sort { f $MVgX
MF/359r)Et
private static final int THRESHOLD = 10; 3R%'<MV|
7_ g}t!b`
/* (KaP=t}
* (non-Javadoc) lgTavs
* $a(EF
6
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) lJ!+n<K+
*/ iivuH2/~?[
public void sort(int[] data) { :.B};;N
int[] temp=new int[data.length]; L 0kK' n?
mergeSort(data,temp,0,data.length-1); `INcZr"
} Hw8`/'M=%5
Wd'wL"6De
private void mergeSort(int[] data, int[] temp, int l, int r) { -fu=RR
int i, j, k; 2`,{IHu*!
int mid = (l + r) / 2; c #+JG
if (l == r) Hk%m`|Z
return; WZaOw w
if ((mid - l) >= THRESHOLD) '7}s25[{\
mergeSort(data, temp, l, mid); SEQ
bw](ss
else X_XeI!,b
insertSort(data, l, mid - l + 1); /!,>P[Vx
if ((r - mid) > THRESHOLD) RS@*/.]o
mergeSort(data, temp, mid + 1, r); Px:PoOw\
else 9/R|\
insertSort(data, mid + 1, r - mid); jE_a++
='<0z?Af
for (i = l; i <= mid; i++) { B@dA?w.x
temp = data; 3B95t-
} L2Uk/E
for (j = 1; j <= r - mid; j++) { :.Vn
temp[r - j + 1] = data[j + mid]; U.UN=uv_
} iO4YZ!
int a = temp[l]; lCg'K(|"
int b = temp[r]; N8;/Zd;^
for (i = l, j = r, k = l; k <= r; k++) { 'cJHOd
if (a < b) { 09pnM|8A
data[k] = temp[i++]; 7u-o7#,X2
a = temp; 62Yi1<kV@
} else { CGvU{n,"
data[k] = temp[j--]; <m"Zk k
b = temp[j]; Js[dT|>.
} 2:^Dv1J)rD
} 6!])\Ay
} fQq'_q5
6}A1^RB+w
/** dX-Xzg
* @param data 4vcUHa|4
* @param l yhg^1l|t,
* @param i hSE\RX 9
*/ 8W
Mhe=[
private void insertSort(int[] data, int start, int len) { E\&~S+:Xp
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); z/(^E8F
} Fu:VRul=5$
} ~itrM3^"w
} 6hQ?MYX
TyVn5XHl^
}