归并排序: SLkuT`*
XHxz @_rw
package org.rut.util.algorithm.support; 90~*dNk
3AURzU
import org.rut.util.algorithm.SortUtil; {6'*Phw
W`$[j0
/** 0
y<k][
* @author treeroot &hayR_F9
* @since 2006-2-2 cd!|Ne>fe
* @version 1.0 .nEs:yn
*/ kMy<G8 s
public class MergeSort implements SortUtil.Sort{ 2 H[ ; v +
{Eu'v$c!
/* (non-Javadoc) T2wv0sHlt
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) {XtoiI
*/ ~r<p@k=.#0
public void sort(int[] data) { -kl;!:'.3
int[] temp=new int[data.length]; 14H'!$
mergeSort(data,temp,0,data.length-1); nbGoJC:U
} c45tmul
sAi&A9"*
private void mergeSort(int[] data,int[] temp,int l,int r){ `(!NYx
int mid=(l+r)/2; j 1(T )T
if(l==r) return ; _gKu8$o=-
mergeSort(data,temp,l,mid); $A`xhh[
mergeSort(data,temp,mid+1,r); !.EcP=S
for(int i=l;i<=r;i++){ )1f+ld%R
temp=data; o/cr{>"N
} c3] C:t+
int i1=l; XLm@etf
int i2=mid+1; -Q$b7*"z(
for(int cur=l;cur<=r;cur++){ KAed!z9
if(i1==mid+1) :#{-RU@PS
data[cur]=temp[i2++]; (/K5! qh
else if(i2>r) D`Gt
data[cur]=temp[i1++]; x=-0 zV
else if(temp[i1] data[cur]=temp[i1++]; =EW3&+Lt
else vX+.e1m
data[cur]=temp[i2++]; qD-fw-,:
} ?E<c[*F05
} QH~Jy*\+PX
G>%AZr{M
} j0FW8!!-g
3B{[%#vO
改进后的归并排序: 7^MX l
d+6]u_J
package org.rut.util.algorithm.support; ;i\C]*
)~V}oKk0t
import org.rut.util.algorithm.SortUtil; 5Z{_m;I.
jWvtv ng
/** B'}"AC"
* @author treeroot +8AvTSgX%
* @since 2006-2-2 \D?:J3H*]
* @version 1.0 ~*}$>@f{[X
*/ #~k[ 6YR 0
public class ImprovedMergeSort implements SortUtil.Sort { \iru7'S
+`.,| |Mq
private static final int THRESHOLD = 10; Ox qguT,
\dcdw*v@
/* -U-P}6^
* (non-Javadoc) 5M:D?9E+
* ES}. xZ#~
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) \}JrFc%O
*/ /r^[a,Q#x
public void sort(int[] data) { b9Y_!Qe
int[] temp=new int[data.length]; m'x;,xfY&F
mergeSort(data,temp,0,data.length-1); b,@aqu
} C>X|VP|C
]^K;goQv
private void mergeSort(int[] data, int[] temp, int l, int r) { VFj(M
j`}G
int i, j, k; /0lC KU!=
int mid = (l + r) / 2; {.CMD9F[
if (l == r) uWjU OJEe
return; s;Y<BD
if ((mid - l) >= THRESHOLD) ^.goO]
mergeSort(data, temp, l, mid); Izo! rC
else %NajFjBI
insertSort(data, l, mid - l + 1); nt ,7u(
if ((r - mid) > THRESHOLD) >(3\kiYS
mergeSort(data, temp, mid + 1, r); cp6WMHLj
else >72JV;W]
insertSort(data, mid + 1, r - mid); 30Drrno7Io
r:&|vP
for (i = l; i <= mid; i++) { xAhxD|4_
temp = data; pQWHG#?7
} 8TWTbQ
for (j = 1; j <= r - mid; j++) { CQ^3v09N;~
temp[r - j + 1] = data[j + mid]; ^jD1vUL 2:
} v`DI<Lt
int a = temp[l]; sx
9uV
int b = temp[r]; 3`F) AWzdr
for (i = l, j = r, k = l; k <= r; k++) { =Z,5$6%)
if (a < b) { M#,Q
^rH#
data[k] = temp[i++]; H&4~Uo.5
a = temp; Rc[ 0aj:
} else { zY=jXa)K~
data[k] = temp[j--]; OH6^GPF6
b = temp[j]; &@v<nO-
} t'1Y@e
} YF[f Z
} p
&(OZJT
1;lmu]I>)
/** H?` g!cX
* @param data k< j"~S1
* @param l x,8<tSW)Z
* @param i #=,imsW)
*/ p_2pU)%
private void insertSort(int[] data, int start, int len) { D WiBG
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1);
2oVV'9;B
} DN8}glVxV
} 1S:|3W
} SJ?)%[(T
#VGjCEeU
}