归并排序: >nvK{6xR:
).e}.Z6[i`
package org.rut.util.algorithm.support; <W7WlT
unz~vG1Tn
import org.rut.util.algorithm.SortUtil; .V_5q:tu
Z:x`][vg
/** b~YIaD[Z
* @author treeroot U-,s/VQ?
* @since 2006-2-2 Z }>;@c
* @version 1.0 5^ubXA
*/ 3tkCmB
public class MergeSort implements SortUtil.Sort{ &l_}yf"v
.~rg#*]^
/* (non-Javadoc) KV6D0~
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) P (Y\l
*/ [4dX[
public void sort(int[] data) { ? `kZ 6$
int[] temp=new int[data.length]; ;}ThBb3
mergeSort(data,temp,0,data.length-1); z" ?WT$
} ]EQ*!
o:4#AkS
private void mergeSort(int[] data,int[] temp,int l,int r){ _E6N*ORV
int mid=(l+r)/2; zq ?xY`E
if(l==r) return ; 8$X3 J[_j
mergeSort(data,temp,l,mid); /?TR_>
mergeSort(data,temp,mid+1,r); ;AL:VU
for(int i=l;i<=r;i++){ @g" vuaG}
temp=data; {/aHZ<I&^h
} Vr%ef:uVV
int i1=l; 1B~Z1w
int i2=mid+1; cb{"1z
for(int cur=l;cur<=r;cur++){ \,v+ejhw
if(i1==mid+1) 2<w vO 9
data[cur]=temp[i2++]; %AWc`D
else if(i2>r) mZM7 4!4X
data[cur]=temp[i1++]; ]TcQGW@'
else if(temp[i1] data[cur]=temp[i1++]; [io|qLr}\
else -m
;n}ECg
data[cur]=temp[i2++]; #!#s7^%K&
} K,U8 vc
} 37jrWe6xwp
})J}7@VPO
} # Oq.}x?i
|*-<G3@
改进后的归并排序: <viC~=k;
>XM]UdP
package org.rut.util.algorithm.support; :Y9/} b{
IAe/)
import org.rut.util.algorithm.SortUtil; qss)5a/x.
Wa&!1'
@
/** AUIp
vd
* @author treeroot WNKP';(a@G
* @since 2006-2-2 NN5Ejr,
* @version 1.0 kh#fUAt
*/ ?*7Mn`
public class ImprovedMergeSort implements SortUtil.Sort { -g|ji.
WA:r4V
private static final int THRESHOLD = 10; KU]o=\ak%
L$kB(Brw
/* SZR`uS
* (non-Javadoc) ###>0(n
* 9ZY,T]ym?
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) M#m;jJqON
*/ E'SDT*EI
public void sort(int[] data) { "J+4
int[] temp=new int[data.length]; %so{'rQl
mergeSort(data,temp,0,data.length-1); Qj(ppep\U"
} G\V*j$}!
&,{YfAxQ`
private void mergeSort(int[] data, int[] temp, int l, int r) { {[L('MH2|
int i, j, k; \ a(ce?C
int mid = (l + r) / 2; B_b5&M@
if (l == r) [8[<4~{
return; Y#=MN~##t
if ((mid - l) >= THRESHOLD) T5.^
w
mergeSort(data, temp, l, mid); m&'!^{av
else &"hEKIqL
insertSort(data, l, mid - l + 1); x7G*xHJ
if ((r - mid) > THRESHOLD) #V#!@@c;?
mergeSort(data, temp, mid + 1, r); mF jM6pmo
else 2\gIjXX"
insertSort(data, mid + 1, r - mid); ?N!kYTR%}
~#}T|
for (i = l; i <= mid; i++) { b`=g#B|
temp = data; 6qT-
} rK:cUW0]X
for (j = 1; j <= r - mid; j++) { y=EVpd
temp[r - j + 1] = data[j + mid]; UEfY'%x
} X|ZAC!J5>
int a = temp[l]; =_ b/g
int b = temp[r];
j|!t3}((
for (i = l, j = r, k = l; k <= r; k++) { MOnTp8
if (a < b) { 8?YeaMIBB
data[k] = temp[i++]; b`^Q ':^A
a = temp; Y~UAE.
} else { hCd? Kti
data[k] = temp[j--]; S9r+Nsn
b = temp[j]; u|.7w2
} EUQtl_h/H
} |d*a~T0
} c$tX3ug6I
X ,^([$
/** ;z N1Qb
* @param data uN>5Eh&=Pf
* @param l $AE5n>ZD$
* @param i cY kb3(
*/ yO!M$aOn/
private void insertSort(int[] data, int start, int len) { #Nco|v
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); $gD8[NAIx=
} YhS_ ,3E
} e3~{l~Rb
} .jk
A'i@
,-8-Y>[
}