归并排序: y;Cs#eo
84.L1|k
package org.rut.util.algorithm.support; YB7n}r23
%L* EB;nK
import org.rut.util.algorithm.SortUtil; ~Ym_ {
I51]+gEN
/** $uDgBZA\
* @author treeroot Qgj# k
* @since 2006-2-2 OU/}cu
* @version 1.0 Lm~<BBp.
*/ ;7qIm83
public class MergeSort implements SortUtil.Sort{ 38p"lT
G9^`cTvv'8
/* (non-Javadoc) Z! O4hA4
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ~q}L13^k
*/ (g@\QdH`|
public void sort(int[] data) { mdEJ'];AH
int[] temp=new int[data.length]; 0|FxSc
mergeSort(data,temp,0,data.length-1); 'Og@<~/Xy
} ?LmeZ}K
Bh2l3J4X
private void mergeSort(int[] data,int[] temp,int l,int r){ <[)-Q~Gg5
int mid=(l+r)/2; W&Fm;m@M
if(l==r) return ; `!Z?F]):G
mergeSort(data,temp,l,mid); '~&W'='b;
mergeSort(data,temp,mid+1,r); dEtjcId
for(int i=l;i<=r;i++){ 2$5">%?
temp=data; +FqD.= 8
} >-I <`y-H
int i1=l; 4T(d9y
int i2=mid+1; O*l,&5
for(int cur=l;cur<=r;cur++){ }x`Cnn
if(i1==mid+1) KhfADqji|
data[cur]=temp[i2++]; [w'Q9\,p
else if(i2>r) bh1$
A
data[cur]=temp[i1++]; W+#Q>^ Q>
else if(temp[i1] data[cur]=temp[i1++]; cb /Q<i
else +Pb:<WT}%
data[cur]=temp[i2++]; /RJ
} yO1
7C
} g,._3.D
YUEyGhkMV{
} ESRj<p%W
&~P4yI;,
改进后的归并排序: 1OMXg=Y
Gy/w #4xj
package org.rut.util.algorithm.support; uKP4ur@1
FSA%,b;U
import org.rut.util.algorithm.SortUtil; \uOM,98xS
'_G\_h}5
/** q k^FyZ<
* @author treeroot qX-ptsQ
* @since 2006-2-2 tJ6@Ot
* @version 1.0 J;>epM;*
*/ CVa>5vt
public class ImprovedMergeSort implements SortUtil.Sort { 1z8"Gk6
<3{MS],<<
private static final int THRESHOLD = 10; >n09K8
A
Jx.fDVJ
/* am]M2+,2Ip
* (non-Javadoc) 3@I0j/1#k1
* />S^`KSTM
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) - j3Lgm
*/ C K7([>2
public void sort(int[] data) { xUdGSr50
int[] temp=new int[data.length]; w li cuY?
mergeSort(data,temp,0,data.length-1); JLE&nbKS
} =NtHV4=b
JPqd}:u3
private void mergeSort(int[] data, int[] temp, int l, int r) { %,
psUOY
int i, j, k; +-@n}xb@
int mid = (l + r) / 2;
=Pl@+RgK+
if (l == r) !#)t<9]fv
return; ]!/U9"_e"B
if ((mid - l) >= THRESHOLD) 1p.c6[9-
mergeSort(data, temp, l, mid); QgqJ #
else 8D )nM|
insertSort(data, l, mid - l + 1); C>+n>bH]L
if ((r - mid) > THRESHOLD) ,~d0R4)
mergeSort(data, temp, mid + 1, r); N@c GjpQ
else +-<G(^
insertSort(data, mid + 1, r - mid); <}RI<96
n>ui'}L
for (i = l; i <= mid; i++) { TF/NA\0c$
temp = data; U*r54AyP
} 7{F\b
for (j = 1; j <= r - mid; j++) { R!j #
temp[r - j + 1] = data[j + mid]; @.W; 3|~qc
} GGuU(sL*
int a = temp[l]; V8M()7uJ
int b = temp[r]; Qfm$q~`D^W
for (i = l, j = r, k = l; k <= r; k++) { ^Lgvey%
if (a < b) { e-ta 7R4
data[k] = temp[i++]; -"I$$C
a = temp; jhm3:;Z
} else { ,' |J
data[k] = temp[j--]; MV" n{1B
b = temp[j]; d%8n
} d-~V.
} srv4kodj
} G JRl{Y
S1|u@d'
/** `yv?PlKL
* @param data 2PlhnU Q7
* @param l u8zL[]>
* @param i ;l*%IMB
*/ $ZI]
private void insertSort(int[] data, int start, int len) { o`S``?`^)^
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); PeIx41. +s
} f]/2uUsg%
} 79cM_O
} {l5fKVb\C
r#2Fk&Z9
}