归并排序: e-vL!&;2
BhC.#u/
package org.rut.util.algorithm.support; ++ !BSQ e
)HWf`;VQ
import org.rut.util.algorithm.SortUtil; @mM'V5_#
gE8p**LT+
/** VE{[52
* @author treeroot EJ&[I%jU
* @since 2006-2-2 X=]FVHV;
* @version 1.0 )+T\LU
*/ 'ms&ty*T
public class MergeSort implements SortUtil.Sort{ Dlhb'*@
f%ude@E3
/* (non-Javadoc) 2VaQxctk
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) =y.!Ny5A
*/ y)N57#e
public void sort(int[] data) { o#Q0J17i?
int[] temp=new int[data.length]; >]uV
mergeSort(data,temp,0,data.length-1); |~vo
} 1?s]nU
Sgp$B:
private void mergeSort(int[] data,int[] temp,int l,int r){ lN"%~n?
int mid=(l+r)/2; t~m > \(&
if(l==r) return ; V"=(I'X
mergeSort(data,temp,l,mid); G/ToiUY
mergeSort(data,temp,mid+1,r); ??Zh$^No:
for(int i=l;i<=r;i++){ Z>1\|j
temp=data; m~a'
} g2;!AI5f
int i1=l; #`R`!4
int i2=mid+1; )=6|G^
for(int cur=l;cur<=r;cur++){ $OMTk
if(i1==mid+1) P+00wbx0
data[cur]=temp[i2++]; #=r:;,,
else if(i2>r) "bZ{W(h
data[cur]=temp[i1++]; t3%[C;@wB
else if(temp[i1] data[cur]=temp[i1++]; #T_m|LN7
else j?sq i9#
data[cur]=temp[i2++]; '?Fw]z1$
} K4938
v
} -Bymt[
2uw1R;zw
} 9&e=s<6dO
{,z$*nf
改进后的归并排序: 3dm lP2
;`<uo$R
package org.rut.util.algorithm.support; ir^%9amh
Dj!v+<b
import org.rut.util.algorithm.SortUtil; CjRI!}S
[]R`h*#
/** Yg_;Eu0'?
* @author treeroot tNf?pV77
* @since 2006-2-2 f
S-(Kmh
* @version 1.0 >D20f<w(H
*/ $|~YXH~O
public class ImprovedMergeSort implements SortUtil.Sort { Q;
DN*
#4uuT?!
private static final int THRESHOLD = 10; Sb@:ercC,
xW92ZuzSH
/* FJ]BB4
K
* (non-Javadoc) J+oK:tzt8
* M(>" e*Pi
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) }T([gc7~
*/ Fljqh8c5
public void sort(int[] data) { VNKtJmt
int[] temp=new int[data.length]; 4t3Y/X
mergeSort(data,temp,0,data.length-1); I75>$"$<
} * N5cC#5`=
w\wS?E4G
private void mergeSort(int[] data, int[] temp, int l, int r) { [K_v,m]
int i, j, k; zq ;YE
int mid = (l + r) / 2; ^~iu),gu
if (l == r) {s^vAD<~x3
return; s~OGlPK
if ((mid - l) >= THRESHOLD) uA]Z"
mergeSort(data, temp, l, mid); yk
r5bS
else w@ 1g_dy
insertSort(data, l, mid - l + 1); U/2]ACGCN^
if ((r - mid) > THRESHOLD) *fs'%"w-
mergeSort(data, temp, mid + 1, r); ""-#b^DQ
else @2H"8KX
insertSort(data, mid + 1, r - mid); $Pw@EC]
t
As@0`x9
for (i = l; i <= mid; i++) { ~dkN`1$v
temp = data; t+C9QXY
} 72J@Dc
for (j = 1; j <= r - mid; j++) { Y`$dtg {
temp[r - j + 1] = data[j + mid]; 3/+r*lv>X
} M=vRy|TL
int a = temp[l]; 70s.
int b = temp[r]; xw2dEvjgp%
for (i = l, j = r, k = l; k <= r; k++) { jhs('n,
if (a < b) { XN+~g.0
data[k] = temp[i++]; v/ dyu
a = temp; d4'*K1m
} else { cWG>w6FI
data[k] = temp[j--]; VRr_s:CWK
b = temp[j]; _
U/[n\oC
} R+}x#
} \^=Wp'5R
} or2BG&W
px `o.%`'
/** 9ure:Dko(Y
* @param data j,@N0~D5
* @param l tl.I:A5L
* @param i k[6%+
*/ $F>
#1:=v<
private void insertSort(int[] data, int start, int len) { ci]IH]x
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 'rWu}#Nb
} ~nul[>z
} !VNLjbee.
} Vn:BasS%
kGaK(^w
}