归并排序: 5hbQUF
,Q
O(QJiS
package org.rut.util.algorithm.support; )Dq/fW
x,SzZ)l-9
import org.rut.util.algorithm.SortUtil; GiN\@F!
UA}oOteG
/** F[SYs/M
* @author treeroot Xz, sL
* @since 2006-2-2 %@d~)f
* @version 1.0 p#95Q
*/ $VCWc#
public class MergeSort implements SortUtil.Sort{ %,M(-G5j;
)FrXD3p
/* (non-Javadoc) UF00K1dbz
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Ug^v
]B9
*/ aGz<Yip
public void sort(int[] data) { "ujt:4p@
int[] temp=new int[data.length]; -Fj:^q:@u
mergeSort(data,temp,0,data.length-1); M(2c{TT
} h[O!kwE
T;%ceLD
private void mergeSort(int[] data,int[] temp,int l,int r){ wz P")}[0
int mid=(l+r)/2; pPdOwK#
if(l==r) return ; -IB~lw
mergeSort(data,temp,l,mid); JUlV$b.)J
mergeSort(data,temp,mid+1,r); vK?{Z^J][
for(int i=l;i<=r;i++){ zF[>K4
temp=data; 3Yd)Fm
} T?+xx^wYk
int i1=l; YrR}55V,
int i2=mid+1; |h,aV(Q
for(int cur=l;cur<=r;cur++){ X192Lar
if(i1==mid+1) ci^+T *
data[cur]=temp[i2++]; f&S,l3H<
else if(i2>r) hD>O LoO
data[cur]=temp[i1++]; F:CqB|
else if(temp[i1] data[cur]=temp[i1++]; EK^ld!g(
else DaW_-:@s
data[cur]=temp[i2++]; EnrRnVB
} ba 3_55]
} \7}X^]UV x
MOFIR
wVZ+
} 7ST[XLwt%}
~T')s-,l,:
改进后的归并排序: ?hS n)
A}b<Lg
package org.rut.util.algorithm.support; Vl!Z|}z
J0}OmNTzD
import org.rut.util.algorithm.SortUtil; iaq0\d.[7
Aov=qLWJ
/** ~h;c3#wuc
* @author treeroot qPpC )6-Q
* @since 2006-2-2 eA>O<Z1>
* @version 1.0 Nvs8t%
*/ i8nCTW
public class ImprovedMergeSort implements SortUtil.Sort { `n7z+
`?Wak=]g
private static final int THRESHOLD = 10; 6P'
m0
V&DS+'P
/* ;b$(T5
* (non-Javadoc) .3,s4\.kT
* n-dO |3,
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Z^AACKME
*/ 0 )#5_-%
public void sort(int[] data) { :JqH.Sqk
int[] temp=new int[data.length];
_tN"<9v.
mergeSort(data,temp,0,data.length-1); L^VG?J
} +GWeu0b(~
A1p;Ye>o~
private void mergeSort(int[] data, int[] temp, int l, int r) { pd,5.d
int i, j, k; "7RQrz
int mid = (l + r) / 2; `ejE)VL=8h
if (l == r) jd=k[Yqr
return; 7vV3"uns
if ((mid - l) >= THRESHOLD) v\t$. _at
mergeSort(data, temp, l, mid); B5!$5Qc
else 0?ZJJdI3
insertSort(data, l, mid - l + 1); j ij:}.d6
if ((r - mid) > THRESHOLD) 7,_N9Q]rB
mergeSort(data, temp, mid + 1, r); VZJs@qx:Z
else H;}V`}c<`
insertSort(data, mid + 1, r - mid); CJ&0<Z}{m
ZYrXav<
for (i = l; i <= mid; i++) { )2z
(l-$.
temp = data; jGd{*4{3+
} ;|b
D@%@
for (j = 1; j <= r - mid; j++) { S(Xab_DT)H
temp[r - j + 1] = data[j + mid]; x+"~-KO8q$
} GLt#]I"LY
int a = temp[l]; 8OZc:/
int b = temp[r]; on+
c*#
for (i = l, j = r, k = l; k <= r; k++) { PV>-"2n
if (a < b) { 9rtcI[&?0
data[k] = temp[i++]; )`^t,x<S
a = temp; JMpjiB,A}
} else { Dq
Kk9s;6_
data[k] = temp[j--]; 8\`]T%h
b = temp[j]; #~q{6()e:
} >tqLwC."'
} LqPn$rZ|$
} b-@VR
"o`N6@[w^
/** ^:\|6`{n
* @param data `pE~M05
* @param l f$NudG!S
* @param i .#6Dad=S*
*/ ~9p*zC3M
private void insertSort(int[] data, int start, int len) { 4_8%ZaQ\.?
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1);
Jt.dR6,
} P(d4~hS
} $&='&q
} j{IAZs#@>
}?^5\ot u
}