归并排序: Y<fXuj|&
:?k=Yr
package org.rut.util.algorithm.support; mJR
T+SZ
@\}36y
import org.rut.util.algorithm.SortUtil; M)^9e?
q:sR zX
/** Vp{2Z9]}
* @author treeroot "<a|Q ,!
* @since 2006-2-2 %pQ o%<d
* @version 1.0 2<@!m@
*/ 695ppiKU
public class MergeSort implements SortUtil.Sort{ nW'x#0-
vGT.(:\-,
/* (non-Javadoc) kk+8NwM1
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) C~V$G}mM
*/ a`Zf_;$@
public void sort(int[] data) { toJ&$HrE
int[] temp=new int[data.length]; Pv.@Y30
mergeSort(data,temp,0,data.length-1); o|q#A3%?
} S6tH!Z=(g
{o%R~{6
private void mergeSort(int[] data,int[] temp,int l,int r){ .Kwl8xRg
int mid=(l+r)/2; (C@@e'e
if(l==r) return ; htym4\Z=
mergeSort(data,temp,l,mid); 7'uc;5:
mergeSort(data,temp,mid+1,r); !I_4GE,
for(int i=l;i<=r;i++){ @{lnfOESl
temp=data; 6J+ZeBk??
} 0 %+k>(@R
int i1=l; ]bweQw@i
int i2=mid+1; X-FHJ4
for(int cur=l;cur<=r;cur++){ #?6RoFgMe
if(i1==mid+1) {2@96o2}
data[cur]=temp[i2++]; jMbK7
1K%
else if(i2>r) g>zL{[e!
data[cur]=temp[i1++]; >K%x44|
else if(temp[i1] data[cur]=temp[i1++]; =T$- #bA)
else ]#n4A|&H
data[cur]=temp[i2++]; NLY5L7
} K_n%`5
}
&_j4q
3k^jR1
} =C)1NJx&~
HCK4h DKo}
改进后的归并排序: bp,CvQ'}a
EdpR| z
package org.rut.util.algorithm.support; 1PSb72h<
V}qmH2h
import org.rut.util.algorithm.SortUtil; E76:}(
BUyA]
/** --kK<9J7
* @author treeroot sKO
;p
* @since 2006-2-2 a~>h'}C>
* @version 1.0 :6V8
*/ }DaYO\:yK*
public class ImprovedMergeSort implements SortUtil.Sort { kM`#U
*j
W$S.?[X
private static final int THRESHOLD = 10; |3m%d2V*hF
uLF55:`<
/* >k|[U[@
* (non-Javadoc) e_V(G
* ,RQ-w2j?
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) >B7OTGw
*/ BYU.ptiJJ
public void sort(int[] data) { ]U%Tm>s.
int[] temp=new int[data.length]; A4' aB0^
mergeSort(data,temp,0,data.length-1); n4johV.#
} K>y+3HN[6
<H 6Uo#ao
private void mergeSort(int[] data, int[] temp, int l, int r) { 4+Y5u4`t
int i, j, k; \.]
U
int mid = (l + r) / 2; HrGX-6`
if (l == r) J?'!8,RX
return; X)m2{@v D
if ((mid - l) >= THRESHOLD) \ua.%|
mergeSort(data, temp, l, mid); g\'sGt3 O
else 2|BE{91
insertSort(data, l, mid - l + 1); F1>,^qyG6
if ((r - mid) > THRESHOLD) ^ a:F*<D
mergeSort(data, temp, mid + 1, r); kx[8#+P
else rej[G!
insertSort(data, mid + 1, r - mid); t
,$)PV
#SueT"F
for (i = l; i <= mid; i++) { WM26-nR
temp = data; 1~Nz6
} ~\P.gSiz
for (j = 1; j <= r - mid; j++) { ^iNR(cwgX
temp[r - j + 1] = data[j + mid]; uk,f}Xc
} tPsU7bFk
int a = temp[l]; odDt.gQXU
int b = temp[r]; 7[LC*nrr
for (i = l, j = r, k = l; k <= r; k++) { :Kiu*&{
if (a < b) { &kvVMnok
data[k] = temp[i++]; qb&*,zN
a = temp; t
At+5H
} else { J++D\x#@
data[k] = temp[j--]; )Pq.kn{Sp
b = temp[j]; K4BMa]/U
} S[M$>
} |4vk@0L
} P;Ox|
]7;;uhn`
/** ']Z8C)tK
* @param data G1rgp>m
* @param l U*cj'`eqC
* @param i _wBPn6gg`
*/ ,P^"X5$
private void insertSort(int[] data, int start, int len) { &D:88
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); w]_a0{Uh
} JS9q'd
} 8CCA/6
} C$8=HM3
e
6*=Si}V
}