归并排序: >0{}tRm-P&
QPDh!A3T
package org.rut.util.algorithm.support; k56Qas+3=
?n`m
import org.rut.util.algorithm.SortUtil; KUUA>'=
K>$f#^
/** !Zj]0,^
* @author treeroot pY"WW0p"C
* @since 2006-2-2 `|ie#L(:7/
* @version 1.0 ^el+ej/=
*/ \N*([{X
public class MergeSort implements SortUtil.Sort{ 9E2iZt]
~i5YqH0
/* (non-Javadoc) 6e+'Y"v
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 3Tl<ST\
*/ \9VF)Y.ke
public void sort(int[] data) { u[b |QR=5
int[] temp=new int[data.length]; p@^G)x
mergeSort(data,temp,0,data.length-1); ^~YT<cJ1h
} wsWFD xR
{=ox1+d
private void mergeSort(int[] data,int[] temp,int l,int r){ SV>tw`2
int mid=(l+r)/2; =9jK\ T^
if(l==r) return ; A9MM^jV8
mergeSort(data,temp,l,mid); <giBL L!
mergeSort(data,temp,mid+1,r); 10FiA;
for(int i=l;i<=r;i++){ |:1{B1sqA
temp=data; 13X}pnW
} 7y'uZAF
int i1=l; ^<CVQ8R7
int i2=mid+1; D!rPF)K
)
for(int cur=l;cur<=r;cur++){ 7&ED>Bk
if(i1==mid+1) 1D*=ZkA)
data[cur]=temp[i2++]; ]y0Y (
else if(i2>r) 1hG#
data[cur]=temp[i1++]; z%wh|q
else if(temp[i1] data[cur]=temp[i1++]; |sZqqgZ-
else S\A/*!%~y
data[cur]=temp[i2++]; X2|~(*
} U
g "W6`
} :-1|dE)U
R/hIXO
} ~lw9sm*2v2
8q[;
0
改进后的归并排序: &zEQbHK6
L.HeBeO
package org.rut.util.algorithm.support; puC91
;,&cWz
import org.rut.util.algorithm.SortUtil; ==dKC;
MET9rT
/** Y MX9Z||
* @author treeroot !T`oHs
* @since 2006-2-2 dJ"M#X!Zu
* @version 1.0 '#'noB;,
*/ :o'x?]
public class ImprovedMergeSort implements SortUtil.Sort { o!M8V ^vW
4Z)s8sD KW
private static final int THRESHOLD = 10; ~bLx2=-"
p%Z:SZZ
/* +=3=% %?C
* (non-Javadoc) 6X \g7bg
* <Y]LY_(
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) tk"+ u_u w
*/ nuce(R
public void sort(int[] data) { Fv$tl)p*
int[] temp=new int[data.length]; gQn%RPMh
mergeSort(data,temp,0,data.length-1); :$WO"HfMSn
} yKc-:IBb{u
u R0UfKK
private void mergeSort(int[] data, int[] temp, int l, int r) { c7e,lgG-
int i, j, k; {X!OK3e
int mid = (l + r) / 2; /WuYg
OI
if (l == r) xlI=)ak{
return; PF%-fbh!~
if ((mid - l) >= THRESHOLD) Ir9GgB
mergeSort(data, temp, l, mid); [4z,hob
else p#@ #$u-
insertSort(data, l, mid - l + 1); VfoWPyWD#
if ((r - mid) > THRESHOLD) Cr.YSWg)4
mergeSort(data, temp, mid + 1, r); 0,%{r.\S
else KF.{r
insertSort(data, mid + 1, r - mid); .xRdKt!p
y\?ey'o
for (i = l; i <= mid; i++) { f"ezmZI
temp = data; r_T)|||v
} R/vHq36d
for (j = 1; j <= r - mid; j++) { EW
`hL~{
temp[r - j + 1] = data[j + mid]; 6Tl6A>%s
} GKBoSSnV&
int a = temp[l]; A8)4nOXM
int b = temp[r]; qe0 D[L
for (i = l, j = r, k = l; k <= r; k++) { M8/a laoT
if (a < b) { 76nH)^%l<
data[k] = temp[i++]; ~YYnn7)
a = temp; '75T2Ud
} else { i>m%hbAk
data[k] = temp[j--]; %*
"+kwZ
b = temp[j]; >i/jqT/
} Tq1\
} kaBjA*
} |+#Zuq
I?e5h@uE
/** xRh 22z
* @param data Tgdy;?
* @param l -k'<6op
* @param i G@8)3 @
*/ H[=\_X1o(
private void insertSort(int[] data, int start, int len) { G3.aw
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); `w@:h4f
} /"{d2
} rAenxZ,tF
} hG1:E:}
86ao{l6l C
}