归并排序: 0-LpqX
{]z4k[;.h
package org.rut.util.algorithm.support; ,!V]jP)
@&D?e:|!U
import org.rut.util.algorithm.SortUtil;
;> m"x
[2ax>Yk$
/** vP7K9Kx
* @author treeroot GDYFU*0
* @since 2006-2-2 2+Px'U\
* @version 1.0 jBaB@LO9G
*/ !*2%"H*
public class MergeSort implements SortUtil.Sort{ dd?x(,"A`
0y&I/2
/* (non-Javadoc) {lth+{&L#
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) `mye}L2I
*/ CG'.:`t
public void sort(int[] data) { xEuN
int[] temp=new int[data.length]; T#pk]c6Q
mergeSort(data,temp,0,data.length-1); `%3/
} q1E:l!2al
)2,eFNB#n
private void mergeSort(int[] data,int[] temp,int l,int r){ T[=S$n-'
int mid=(l+r)/2; pZ#ap<|>I
if(l==r) return ; v/ *Y#(X
mergeSort(data,temp,l,mid); 2<mW\$
mergeSort(data,temp,mid+1,r); sH[
-W-
for(int i=l;i<=r;i++){ I\qYkWg7
temp=data; @aQ1khEd
} y~IuP c
int i1=l; yL;M"L
int i2=mid+1; n.hv!W0
for(int cur=l;cur<=r;cur++){ M MzGd:0b
if(i1==mid+1) w&4~Q4
data[cur]=temp[i2++]; l!#m&'16"
else if(i2>r) ]|_\xO(
data[cur]=temp[i1++]; yqSs,vz
else if(temp[i1] data[cur]=temp[i1++]; "RVcA",
else X7L8h'(@
data[cur]=temp[i2++]; OT^%3:zg
} B3Jgd,[
} 6Es?
MW=
T32BnmB{
} y2O4I'/5<
Q-#$Aa
改进后的归并排序: 2xw6 5z
<8UYhGK
package org.rut.util.algorithm.support; iYnEwAoN;
=h(W4scgqX
import org.rut.util.algorithm.SortUtil; h;5LgAY|v
iJnU%
/** 3D9!M-
* @author treeroot Pmi#TW3X
* @since 2006-2-2 /~4"No@
* @version 1.0 (;VVCAoy
*/ `Q+moX
public class ImprovedMergeSort implements SortUtil.Sort { &'l>rD^o
-T6(hT\
private static final int THRESHOLD = 10; CIjZG ?A
ND<!4!R^
/* 8@NH%zWBp
* (non-Javadoc) XPB9~::
* :|o<SZ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) kP xa7
*/ #k3t3az2{
public void sort(int[] data) { 0?WcoPU
int[] temp=new int[data.length]; +h2eqNr
mergeSort(data,temp,0,data.length-1); -/]W+[
} /ug8]Lo0
c`x7u}C
private void mergeSort(int[] data, int[] temp, int l, int r) { +!f=jg06
int i, j, k; ( 6(x'ByT
int mid = (l + r) / 2; B=
keBO](@
if (l == r) %LXM+<N8
return;
"o& E2#
if ((mid - l) >= THRESHOLD) 5 ,0d
mergeSort(data, temp, l, mid);
s95vK7I
else {b]aC
insertSort(data, l, mid - l + 1); >pkT1Z&'
if ((r - mid) > THRESHOLD) _md=Q$9!m
mergeSort(data, temp, mid + 1, r); UN"(5a8.
else [<`SfE
insertSort(data, mid + 1, r - mid); |%~+2m
QrApxiw
for (i = l; i <= mid; i++) { (h']a!
temp = data; IPuA#C
} T^Ab!O
for (j = 1; j <= r - mid; j++) { lCW8<g^
temp[r - j + 1] = data[j + mid]; tgL$"chj@x
} p8wyEHB
int a = temp[l]; [nxE)D
int b = temp[r]; P?BGBbC
for (i = l, j = r, k = l; k <= r; k++) { ~_9"3,~o5
if (a < b) { wPbkUVO
data[k] = temp[i++]; k\Q,h75
a = temp; 1
4LI5T
} else { 3M5#4n\v$
data[k] = temp[j--]; -Xz?s
b = temp[j]; 8#R?]Uwq
} BiE08,nj
} Bs`$ i ;&
} =Nz0.:
J H.K.C(
/** +b;hBb]R
* @param data (Lh#`L?x
* @param l Z?MoJ{.!?R
* @param i T~sTBGcv
*/ &PcyKpyd
private void insertSort(int[] data, int start, int len) { elJ)4Em
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); HEK-L)S.
*
} +.[\g|G
} F?Ju??O
} 0f ER*.F
Dj-s5pAW
}