归并排序: /<E5"Mm%
f-}[_Y%;
package org.rut.util.algorithm.support; N*%@
j]*j}%hz
import org.rut.util.algorithm.SortUtil; 5Ycco,x
iOwx0GD.n
/** $"0M U
* @author treeroot HOw-]JSP2
* @since 2006-2-2 m0LTx\w!
* @version 1.0 8d?g]DEN)6
*/ "5;;)\o~
public class MergeSort implements SortUtil.Sort{ @.G[s)x
~7Ts_:E-
/* (non-Javadoc) ^[]}R:
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) #Xhdn\7
*/ x\F,SEj
public void sort(int[] data) { -`<kCW"
int[] temp=new int[data.length]; K#*reJ}K
mergeSort(data,temp,0,data.length-1); g) p,5BADm
} SxdE?uCUS
uvtF_P/
private void mergeSort(int[] data,int[] temp,int l,int r){ .{ 44a$)
int mid=(l+r)/2; J\d3N7_d
if(l==r) return ; %FXfqF9
mergeSort(data,temp,l,mid); )ap_Z6
mergeSort(data,temp,mid+1,r); +
` s@
for(int i=l;i<=r;i++){ /V8}eZ97
temp=data; \zieyE
} (Q%'N3gk
int i1=l; ~\=1'D^6CK
int i2=mid+1; f` :i.Sr
for(int cur=l;cur<=r;cur++){ /J04^6
if(i1==mid+1) ,S'p%g
data[cur]=temp[i2++]; yyv8gH
else if(i2>r) I*x[:)X8
data[cur]=temp[i1++]; 9;Itqe{8w
else if(temp[i1] data[cur]=temp[i1++]; Gqcq,_?gt
else ?47@o1
data[cur]=temp[i2++]; Vnx,5E&
} ?"zY"*>4
} QFg sq{
0GB:GBhZ
} Swp;HW7x
|AcRIq
改进后的归并排序: fQL"O}Z
g0>,%b
package org.rut.util.algorithm.support; YhOlxON
WA]c=4S
import org.rut.util.algorithm.SortUtil; m>4ahue$
q6_u@:3u
/** j'%$XvI
* @author treeroot z|asa*
* @since 2006-2-2 t]$P 1*I
* @version 1.0 Eq$&qV-?(
*/ Sp7ld7c
public class ImprovedMergeSort implements SortUtil.Sort { +<xQM h8
pX&pLaF
private static final int THRESHOLD = 10; LEW'G"+
BZud)l24
/* $ "E).j
* (non-Javadoc) 8wVY0oRnU
* u}!@ ,/)
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 'd+NVj{C
*/ _^el\
public void sort(int[] data) { 0$7s^?G0
int[] temp=new int[data.length]; OR}c)|1
mergeSort(data,temp,0,data.length-1); H|RT?Q
} ][W_[0v
]l'Y'z,}
private void mergeSort(int[] data, int[] temp, int l, int r) { cgl*t+o&
int i, j, k; 6&bY} i^K
int mid = (l + r) / 2; /%0<p,T
if (l == r) %Eb%V ($
return; i/~1F_
if ((mid - l) >= THRESHOLD) Z9575CI<
mergeSort(data, temp, l, mid); 9:`(Q3Ei
else *Ho/ZYj3
insertSort(data, l, mid - l + 1); U
f|>
(C
if ((r - mid) > THRESHOLD) Vs%|pIV
mergeSort(data, temp, mid + 1, r); 0A,]$Fzt
else F)s{P Cl
insertSort(data, mid + 1, r - mid); w3=%*<
dxZu2&gi
for (i = l; i <= mid; i++) { Ix(?fO#uNF
temp = data; Gm9hYhC8
} YqPQ%
for (j = 1; j <= r - mid; j++) { ;]gP@ h/
temp[r - j + 1] = data[j + mid]; x~GQV^(l3
} {"&SJt[%X
int a = temp[l]; /1x,h"T\<
int b = temp[r]; A5i :x$ww
for (i = l, j = r, k = l; k <= r; k++) { ~zSCg|"r
if (a < b) { s3]?8hXd
data[k] = temp[i++]; -1ce<nN
a = temp; ]u4Hk?j~<
} else { %F:)5gT?
data[k] = temp[j--]; EhO|~A*R
b = temp[j]; E<C&Cjz:H
} U Z|HJ8_
} dbOdq
} W
D
T]!
z I+\Oll#Q
/** \MjJ9u `8
* @param data NPd%M
* @param l u%]shm
* @param i 2gzou|Y
*/ y`$Q\}fS
private void insertSort(int[] data, int start, int len) { FBpH21|/y
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); l5g$vh\aQ]
} 1j:Wh
} d'/TdVM
} J|X
6j&-
F
B?UZ
}