归并排序: "=9kX`(1 y
3erGTa[|q
package org.rut.util.algorithm.support; 5cE?>
U#U nM,3%
import org.rut.util.algorithm.SortUtil; 298@&_
sy;_%,}N
/** c;pv< lX'
* @author treeroot M;K%=l$NG
* @since 2006-2-2 fG*366W
* @version 1.0 m6oaO9"K
*/ qg#|1J6e
public class MergeSort implements SortUtil.Sort{ ~kW[d1'c
I,d5Y3mC
/* (non-Javadoc) FOx&'dH%@
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) O$,MdhyXC
*/ 2RC|u?+@
public void sort(int[] data) { 8RJ^e[?o(
int[] temp=new int[data.length]; KWH l+pL
mergeSort(data,temp,0,data.length-1); q2C._{ 0'
} wio}<Y6Xz
_]# ^2S
private void mergeSort(int[] data,int[] temp,int l,int r){ zs~v6y@
int mid=(l+r)/2; k2cC:5Xf3
if(l==r) return ; K6l{wyMb|
mergeSort(data,temp,l,mid); ~t-!{F
mergeSort(data,temp,mid+1,r); Vy7o}z`
for(int i=l;i<=r;i++){ eAD uk!Iq
temp=data; j"c30AY
} @?r[
$Ea1M
int i1=l; l4+Bs!i`
int i2=mid+1; mE}@}@(
for(int cur=l;cur<=r;cur++){ ^N\$oV$
if(i1==mid+1) HM(S}>
data[cur]=temp[i2++]; Gn8'h
TM
else if(i2>r) 1||\3L/
data[cur]=temp[i1++]; #[C=LGi
else if(temp[i1] data[cur]=temp[i1++]; _rU%DL?
else kg^VzNX
data[cur]=temp[i2++]; x<es1A'u6
} F+3}Gkn
} Lradyo44u\
|kXx9vGq@
} -]K9sy)I
b,Vg3BS
改进后的归并排序: %P2l@}?a
gx',~
package org.rut.util.algorithm.support; j aEUz5
ZcLW8L
import org.rut.util.algorithm.SortUtil; _sGmkJi]
RMvq\J}w!
/** 7(S66
* @author treeroot |r%NMw #y
* @since 2006-2-2 XDdF7i}
* @version 1.0 4Lb!Au|Y
*/ ~0 Ifg_G
public class ImprovedMergeSort implements SortUtil.Sort { hE|W%~Jx
0mMoDJRy
private static final int THRESHOLD = 10; G)G
257K"~
j@HOU~x
/* tvlrUp
* (non-Javadoc) (rfR:[JkC2
* p?v. 42R:z
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) _P{f+HxU
*/ y k{8O.g
public void sort(int[] data) { 0lm7'H*~
int[] temp=new int[data.length]; H-|%\9&{S
mergeSort(data,temp,0,data.length-1); z?DI4O#Up
} ^.HvuG},O
Ok V*,n
private void mergeSort(int[] data, int[] temp, int l, int r) { 3Hd~mfO\
int i, j, k; &{uj3s&C
int mid = (l + r) / 2; nign"r
if (l == r) 45aUz@
return; \QvoL
if ((mid - l) >= THRESHOLD) wJ%;\06
mergeSort(data, temp, l, mid); {)?:d6"
else 9k.5'#
insertSort(data, l, mid - l + 1); };Oyv7D+b
if ((r - mid) > THRESHOLD) f)x(sk
mergeSort(data, temp, mid + 1, r); x,% %^(
else a7@':Rb n
insertSort(data, mid + 1, r - mid); LN0pC}F
/L yoTBG
for (i = l; i <= mid; i++) { BtA_1RO
temp = data; Rl/5eE8
} 5w+KIHhN|
for (j = 1; j <= r - mid; j++) { r&y0`M
temp[r - j + 1] = data[j + mid]; 31^Jg
} ouE/\4'NB
int a = temp[l]; wr-/R"fX
int b = temp[r]; uSgR|b;R]
for (i = l, j = r, k = l; k <= r; k++) { YstR
T1
if (a < b) { (xdC'@&
data[k] = temp[i++]; e1OGGF%En
a = temp; n(h9I'V8)F
} else { 90[6PSXk
data[k] = temp[j--]; [2$mo;E?
b = temp[j]; cTJi8f=g
}
-k8<LR3
} 0Fw4}f.o
} DEw>f%&4
tP][o494\&
/** B%^W$7
q
* @param data .mbqsb]&Y
* @param l Ls`[7w
* @param i 0H/)wy2ym
*/ 'CMbqLk#
private void insertSort(int[] data, int start, int len) { U
#C@&2
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); akA7))Q
} 1PB"1.wnd
} H[_i=X3-~
} [} zzG@g,J
kz\Ss|jl
}