归并排序: (Rp5g}b
p2fzbBt
package org.rut.util.algorithm.support; t$p%UyVE
LaZ
@4/z!
import org.rut.util.algorithm.SortUtil; DHyQ:0q
T-lP=KF=
/** BeD>y@ it
* @author treeroot nB[B
FVkU
* @since 2006-2-2 JlawkA
* @version 1.0 D8xE"6T>
*/ foY]RkW9
public class MergeSort implements SortUtil.Sort{ YguW2R=6]
y5D3zqCG
/* (non-Javadoc) >HzTaXCR[
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) D5xTuv9T
*/ |%rRALIY
public void sort(int[] data) { _5p]Arg?}&
int[] temp=new int[data.length]; x>Dix1b:.
mergeSort(data,temp,0,data.length-1); "jq6FT)O
} q1 BpE8
Se\iMs
private void mergeSort(int[] data,int[] temp,int l,int r){ jaVx9FR+
int mid=(l+r)/2; Nr"GxezU+A
if(l==r) return ; 9KT85t1#
mergeSort(data,temp,l,mid); .vIRz-S
mergeSort(data,temp,mid+1,r); *IF~ab2
for(int i=l;i<=r;i++){ jd"YaZOQ
temp=data; x
#|t#N%
} O`PQ4Q*F
int i1=l; I8IH\5k
int i2=mid+1; 8Bxb~*
for(int cur=l;cur<=r;cur++){ +K2HMf'
if(i1==mid+1) =NPo<^Lae
data[cur]=temp[i2++]; $%ztP
Ta
else if(i2>r) @)z?i
data[cur]=temp[i1++]; `Cy;/95m
else if(temp[i1] data[cur]=temp[i1++]; 83'rQDo)G
else 'g}Q@@b
data[cur]=temp[i2++]; A9Pq}3U
} )sK_k
U{\
} }Py Z{yS
q^QLNKOH"
} z}*L*Sk
3XUsw1,[
改进后的归并排序: O"RIY3m
0nR_I^
package org.rut.util.algorithm.support; Go~3L8
'
=#%Vs>G
import org.rut.util.algorithm.SortUtil; =trLL+vGw'
/q"8sj/
/** PBwKR D[I
* @author treeroot T\7t#Z
k
* @since 2006-2-2 gA2]kZg
* @version 1.0 _w%{yF6
*/ 3Z%jx#
public class ImprovedMergeSort implements SortUtil.Sort { ;M*G
iTCY $)J
private static final int THRESHOLD = 10; yoBR'$-=
`mN5s q
/* ;4`%?6%
* (non-Javadoc) 5j5}c`:
* -e *(+
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) XIp>PcU^
*/ 7X .B
public void sort(int[] data) { =~k#<q1^
int[] temp=new int[data.length]; }SS~uQ;8
mergeSort(data,temp,0,data.length-1); AUr~b3< 6
} ]sB%j@G
TM,Fab &
private void mergeSort(int[] data, int[] temp, int l, int r) { R^JtWjJR
int i, j, k; >WY\P4)k
int mid = (l + r) / 2; ]%h|ox0
if (l == r) 1X#gHstD
return; $~1~+s0$
if ((mid - l) >= THRESHOLD) G"*ch$:
mergeSort(data, temp, l, mid); b5^-qc6X
else R]TS5b-
insertSort(data, l, mid - l + 1); V_=7q=9mV
if ((r - mid) > THRESHOLD) /)XN^Jwa;m
mergeSort(data, temp, mid + 1, r); "!PN +gB
else OH` |aqN
insertSort(data, mid + 1, r - mid); }h9f(ZyJn
Q::_i"?c
for (i = l; i <= mid; i++) { a]?o"{{+
temp = data; e/<'HM T
} 1u_< 1X3
for (j = 1; j <= r - mid; j++) { Z$Vd8U;
temp[r - j + 1] = data[j + mid]; Uc]sWcR
}
9Cq"Szs
int a = temp[l]; lXu6=r
int b = temp[r]; tS3{y*yi
for (i = l, j = r, k = l; k <= r; k++) { 7[YulC-pH
if (a < b) { Xm~N Bt
data[k] = temp[i++]; ]4)$dQ59
a = temp; E:$r" oS
} else { C+aL8_(R
data[k] = temp[j--]; N=TDywRI
b = temp[j]; 42.y.LtZ
} KqzQLu
} G`FY[^:
} Q>l5:2lq
2NZC,znQ
/** ITBa ^P
* @param data 80Z'1'u0
* @param l !2]'S=Y
* @param i n]v,cfn/=<
*/
sf'+;
private void insertSort(int[] data, int start, int len) { Tu}?Q.pKo
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); /fC8jdp&
} y"Jma`Vjq
} p!H'JNG
} ?9:~d#p
{4HcecT
}