归并排序: L"akV,w4p
pUs s_3
package org.rut.util.algorithm.support; xi.L?"^/!
R)3P"sGuN
import org.rut.util.algorithm.SortUtil; rVx%"_'*-
#mNM5(o
/** i%8I (F
* @author treeroot w>:~Ev]
* @since 2006-2-2 ]e'Ol$3U9=
* @version 1.0 "?Eh_Dw
*/ s\6kXR
public class MergeSort implements SortUtil.Sort{ .&AS-">Z
~L G).
/* (non-Javadoc) 8 ]N
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) q89#Ftkt
*/ ztNm,1pnQ
public void sort(int[] data) { `43`*=
int[] temp=new int[data.length]; 8Q&hhmOnz
mergeSort(data,temp,0,data.length-1); wr/Z)e =^3
} ][|)qQ%V
06 kjJ4
private void mergeSort(int[] data,int[] temp,int l,int r){ `[<j5(T
int mid=(l+r)/2; G] -$fz
if(l==r) return ; ik@g; >pQD
mergeSort(data,temp,l,mid); MVW2%6
mergeSort(data,temp,mid+1,r); 7T]}<aK<c[
for(int i=l;i<=r;i++){ dsKEWZ
=
temp=data; z:hY{/-
} ZqHh$QBD
9
int i1=l; .D^=vuxt~
int i2=mid+1; jJc?/1 jv
for(int cur=l;cur<=r;cur++){ HG2i^y
if(i1==mid+1) =y; tOdj
data[cur]=temp[i2++]; W_NQi
else if(i2>r) )SMS<J
data[cur]=temp[i1++]; %t&5o>1C
else if(temp[i1] data[cur]=temp[i1++]; 4+t9"SD
else c]`}DH,TJ
data[cur]=temp[i2++]; Ds4n>V,o
} #:{Bd8PS
} OXy>Tlv
36154*q
} N#-P}\Q9
;?>xuC$
改进后的归并排序: +1j@n.)ft
[-)N}rL>
package org.rut.util.algorithm.support; (Yz EsY
_cqBp7
import org.rut.util.algorithm.SortUtil; 1us-ootsjP
yIBT*,4
/**
c}a.
* @author treeroot 3%?01$k
* @since 2006-2-2 %(GWR@mfC
* @version 1.0 ?\dY!
*/ ?lJm}0>
public class ImprovedMergeSort implements SortUtil.Sort { KLW#+vZ
seh1(q?Va4
private static final int THRESHOLD = 10; HhN;&67~Z
.'md `@t
/* x:W nF62
* (non-Javadoc) kw8?::
<
* 6b9 oSY-8
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) g@!mV)c97
*/ <StyO[
public void sort(int[] data) { G992{B
int[] temp=new int[data.length]; !/W[6'M#p
mergeSort(data,temp,0,data.length-1); -4|\,=j
} nPp\IE}:
^EGe%Fq*x]
private void mergeSort(int[] data, int[] temp, int l, int r) { P9~7GFas|
int i, j, k; =W(mZ#*vdY
int mid = (l + r) / 2; ^2L\Y2
if (l == r) 9Xb,Swo~
return; <]6])f,y\
if ((mid - l) >= THRESHOLD) /; ;_l2 t
mergeSort(data, temp, l, mid); byl#8=?
else =B9Ama
insertSort(data, l, mid - l + 1); 0?} ),8v>
if ((r - mid) > THRESHOLD) -POV#1s
mergeSort(data, temp, mid + 1, r); |^K-m42
else 0xbx2jlkY
insertSort(data, mid + 1, r - mid); L~_3BX
gPO,Z
for (i = l; i <= mid; i++) { JivkY"= F
temp = data; 7e\g
} z1t
YD
for (j = 1; j <= r - mid; j++) { Tbl~6P
temp[r - j + 1] = data[j + mid]; aqq7u5O1r
} w=.w*?>
int a = temp[l]; PtySPDClj
int b = temp[r]; %N#8D<ULd
for (i = l, j = r, k = l; k <= r; k++) { lP*_dt9
if (a < b) { Y4cIYUSc
data[k] = temp[i++]; x8I=I"Sp
a = temp; 4LqJ4jo
} else { ?-CZJr
data[k] = temp[j--]; ',L>UIXw
b = temp[j]; ^&oa\7<'
} tz&'!n}
} h2g|D(u)
} ">vxYi
!+tz<9BBY
/** m\>531&
* @param data 4G`7]<
* @param l Ws"eF0,'Z
* @param i gBQK
*/ =e'b*KTL,
private void insertSort(int[] data, int start, int len) { GxWA=Xp^~G
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); + yX\!H"
} fHTqLYd-
} yyke"D
} T =r7FU
BgLW!|T[
}