归并排序: \h#aPG<yo
[HWVS
package org.rut.util.algorithm.support; qsoq1u,?
\ . #Y
import org.rut.util.algorithm.SortUtil; /mz.HCs
Ro9:kEG$
/** 6Y]P7j
* @author treeroot |}:}14ty
* @since 2006-2-2 &nr{-][
* @version 1.0 ^P~,bO&H.Z
*/ vi^YtA
public class MergeSort implements SortUtil.Sort{ _";w*lg}
rrRv 7J&Q
/* (non-Javadoc) o5&b'WUJ=
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) :
pUu_
*/ .tG3g:
public void sort(int[] data) { _xh)]R
int[] temp=new int[data.length]; [q!]Ds"
_
mergeSort(data,temp,0,data.length-1); Gn^lF7yE
} e`={_R{N
*w*K&$g
private void mergeSort(int[] data,int[] temp,int l,int r){ ,
p}:?uR
int mid=(l+r)/2; < r~hU*u
if(l==r) return ; CUH u=
mergeSort(data,temp,l,mid); `K+%/|!
mergeSort(data,temp,mid+1,r); su=MMr>
for(int i=l;i<=r;i++){ |s/N?/qi
temp=data; Nkj$6(N=zJ
} U"8Hw@
int i1=l; 9Jh&C5\\
int i2=mid+1; 0~BaQ,
A@
for(int cur=l;cur<=r;cur++){ 7O*Sg2B
if(i1==mid+1) Cn5"zDK$
data[cur]=temp[i2++]; tDL.+6/
else if(i2>r) fK=0?]s}I
data[cur]=temp[i1++]; qy pF}Pw
else if(temp[i1] data[cur]=temp[i1++]; *s 4Ym
else zuN(~>YH
data[cur]=temp[i2++]; %/e'6g<
} tKUW
} yW'{Z]09
[Lje?M* r
} G?Gf,{#K
+8Q @R)3
改进后的归并排序: CtN\-E-
*cWHl@4
package org.rut.util.algorithm.support; 7Ji'7$
N#9N ^#1
import org.rut.util.algorithm.SortUtil; a+lNXlh=
v]on0Pi!
/** ({Md({|
* @author treeroot )tJaw#Mih
* @since 2006-2-2 Z+U -+eG
* @version 1.0 ',`Qx{tQ)
*/ uVD^X*
public class ImprovedMergeSort implements SortUtil.Sort { qB_s<cpn>
~
i+XVo
private static final int THRESHOLD = 10; f9#srIx+
`` g
/* AP>n-Z|
* (non-Javadoc) >>J$`0kM*
* ,}W|cm>
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) (kO (R#M
*/ R- >~MLeK]
public void sort(int[] data) { {jYVA~.|Z
int[] temp=new int[data.length]; P^F3,'N
mergeSort(data,temp,0,data.length-1); \e4AxLP
} Ng;?hT w
6X A(<1P
private void mergeSort(int[] data, int[] temp, int l, int r) { =gSc{ i|
int i, j, k;
D~"a"
int mid = (l + r) / 2; VOr:G85*s
if (l == r) ~tfd9,t
return; 3s%DF,
if ((mid - l) >= THRESHOLD) d:>^]5cE&
mergeSort(data, temp, l, mid); U5j4iz'
else bnkZWw'9
insertSort(data, l, mid - l + 1); *FEJ5x
if ((r - mid) > THRESHOLD) FXT^r3
mergeSort(data, temp, mid + 1, r); *ilVkV"U
else q)?!]|pZ
insertSort(data, mid + 1, r - mid); }[|9vF"g.y
X(E`cH
|
for (i = l; i <= mid; i++) { #]1jvB
temp = data; |)>+&
xk
} %pxJ2 7Q
for (j = 1; j <= r - mid; j++) { rlh:|#GTJ
temp[r - j + 1] = data[j + mid]; y-H9fWi8Y&
} kw z6SObQ
int a = temp[l]; `,~'T [
int b = temp[r]; \(Nx)F
for (i = l, j = r, k = l; k <= r; k++) { A405igF
if (a < b) { #9}1Lo>
data[k] = temp[i++]; z0\
$#r^I
a = temp; zx8@4?bK
} else { 9C?SEbC
data[k] = temp[j--]; b4^O=
b = temp[j]; |;|r[aU
} :Wx7a1.Jz
} gzhIOeY
} cZYvP
S)ipkuj X
/** CzreX3i
* @param data i75\<X
* @param l e%ro7~
* @param i 8dx7@y?z
*/ b/oNQQM#Dk
private void insertSort(int[] data, int start, int len) { 5V(#nz
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); dKEy6C"@
} w2b(,w
} -J6`
} |PYyhY
6`'g ${U
}