归并排序: (a)d7y.oo
<PfW
package org.rut.util.algorithm.support; '<XG@L
n*_FC
import org.rut.util.algorithm.SortUtil; Dk[[f<H_{
lT$A;7[
/** !FO||z(vb
* @author treeroot s q :ff
* @since 2006-2-2 (?J&Ar0
* @version 1.0 FQ O6w'
*/ 53l9s<bOQ
public class MergeSort implements SortUtil.Sort{ :r#FI".qx
B-eYWt8s
/* (non-Javadoc) 5ue{&z
@T
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) \/lS!+~'']
*/ X0
%k`3
public void sort(int[] data) { iL5+Uf)E3
int[] temp=new int[data.length]; eOLS
mergeSort(data,temp,0,data.length-1); nk6xavQji
} r[~Km5
NCl={O9<j
private void mergeSort(int[] data,int[] temp,int l,int r){ .O lq_wuH
int mid=(l+r)/2; >eJk)qM
if(l==r) return ; b`%/*
mergeSort(data,temp,l,mid); srC'!I=s>8
mergeSort(data,temp,mid+1,r); f#mY44:,C
for(int i=l;i<=r;i++){ "CLd_H*)c
temp=data; Zx`hutCv
} 5$zC,g*#
int i1=l; t|%iW%m4
int i2=mid+1; lfWxdi
for(int cur=l;cur<=r;cur++){ *[_?4*F
if(i1==mid+1) i<&2Ffvq
data[cur]=temp[i2++]; c: #1Aym
else if(i2>r) 9~u1fk{
data[cur]=temp[i1++]; !@ bN
else if(temp[i1] data[cur]=temp[i1++]; YFsEuaV
else @^%zh
data[cur]=temp[i2++]; 6' ?Y]K
} (5'qEi ea
} #PtV=Ee1
=u73AM}
} ZEHz/Y%
7G2TT a
改进后的归并排序: l} h<2
YMJjO0
package org.rut.util.algorithm.support; i mJ{wF
pspV~9,
import org.rut.util.algorithm.SortUtil; ^V>sNR
3QGg;
/** c< \:lhl
* @author treeroot I_eYTy-a`1
* @since 2006-2-2 b/ur!2yr
* @version 1.0 P3@[x
*/ OGh bH a
public class ImprovedMergeSort implements SortUtil.Sort { v>0xHQD*<M
TX8,+s+
private static final int THRESHOLD = 10; Xt9?7J#\T
%.[GR
/* >dZ x+7
* (non-Javadoc) eGnc6)x@C
* 0} HKmEM
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) knF *~O :y
*/ SOeL@!_
public void sort(int[] data) { "K~+T\^|k
int[] temp=new int[data.length]; SAXjB;VH6
mergeSort(data,temp,0,data.length-1); 6P+8{?V&
} ,uuQj]Dac+
PZH]9[H
private void mergeSort(int[] data, int[] temp, int l, int r) { [)9bR1wh
int i, j, k; Dth<hS,2J
int mid = (l + r) / 2; ^=Up UB
if (l == r) v)J6}H}e
return; UAH} ])U
if ((mid - l) >= THRESHOLD) `@=}5 9+|
mergeSort(data, temp, l, mid); L suc*Ps
else lusINILc
insertSort(data, l, mid - l + 1); 1
!OQxY}f
if ((r - mid) > THRESHOLD) nQg6
j Zf
mergeSort(data, temp, mid + 1, r); &*L:4By)]
else #p*OLQ3~
insertSort(data, mid + 1, r - mid); hIPDJ1a
j'CRm5O
for (i = l; i <= mid; i++) { ' J]V"Z)
temp = data; bg[q8IBCd
} R}Z"Yxx
for (j = 1; j <= r - mid; j++) { A-.jv
temp[r - j + 1] = data[j + mid]; [4(TG<I
} v@"xEf1n[
int a = temp[l]; 3]<$;[Q
int b = temp[r]; 0(-'L\<>x
for (i = l, j = r, k = l; k <= r; k++) { >iWl-hI-
if (a < b) { Wc03Sv&FZ
data[k] = temp[i++]; jlzqa7
a = temp; <;SMczR
} else { Alh%Z\
data[k] = temp[j--]; g"xLS}Al
b = temp[j]; $ShL^g@
} -\AB!#fh
} S1 %{/w
} (a]'}c$X9`
t'0r4&\
/** U}7$:hO"dX
* @param data ma?569Z8~0
* @param l I+8m1*
* @param i QTK\"
*/ F!j@b!J8
private void insertSort(int[] data, int start, int len) { r'pFHX
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); _W tSZmW?
} t`H^!
b
} b
3D:w{l
} GEIMCg(TRj
$U"/.Mh\
}