归并排序: Y0(4]X \ey
L{/%
"2>
package org.rut.util.algorithm.support; O Z
./suR)
jNj;#C)
import org.rut.util.algorithm.SortUtil; UJO3Yn
etX@z'H
/** /8;m.J>bf
* @author treeroot /&Q{B f
* @since 2006-2-2 AJyNlQ
* @version 1.0 |z)s9B;:#i
*/ W.3b]zcV
public class MergeSort implements SortUtil.Sort{ x-i1:W9;
[8T{=+k
/* (non-Javadoc) Y`~B> J
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ]I|(/+}M
*/ S]3CRJU3`
public void sort(int[] data) { ]bds~OY5 U
int[] temp=new int[data.length]; l"ms:v
mergeSort(data,temp,0,data.length-1); B[8bkFS>]
} )tG. 9"<
Q`F1t
private void mergeSort(int[] data,int[] temp,int l,int r){ k;\gYb%L
int mid=(l+r)/2; *)K\&h<{
if(l==r) return ; 1L,L/sOwB&
mergeSort(data,temp,l,mid); R-%6v2;ry
mergeSort(data,temp,mid+1,r); $0$sM/ %
for(int i=l;i<=r;i++){ NP;W=A F
temp=data; G&S2U=KdV%
} L{1sYR%s\
int i1=l; }y6)d.
int i2=mid+1; $udhTI#,
for(int cur=l;cur<=r;cur++){ <,CrE5Pl
if(i1==mid+1) U:8[%a
data[cur]=temp[i2++]; t7by OMC
else if(i2>r) qyM/p.mP
data[cur]=temp[i1++]; J>(X0@eWz
else if(temp[i1] data[cur]=temp[i1++]; ^QNc!{`
else =~
Uhr6Q
data[cur]=temp[i2++]; I|rb"bG
} i~h@}0WR"
} :)1"yo\
P<g(i 6]
} }{R*pmv$bN
NQ`D"n
改进后的归并排序: ]5'$EAsuW
X&9:^$m
package org.rut.util.algorithm.support; v+LJx
(;#c[eKy
import org.rut.util.algorithm.SortUtil; 8>YF}\D V
1<ag=D`F_"
/** ^+x?@$rq
* @author treeroot ^fsMfB
* @since 2006-2-2 * zp tbZ
* @version 1.0 d-b04Q7DQ
*/ K/W=r
public class ImprovedMergeSort implements SortUtil.Sort { uHU@j(&c
s| p I`
private static final int THRESHOLD = 10; sZrVANyqb
gGMfy]]R
/* 6+$2rS$1V
* (non-Javadoc) -;9
}P
* u%C oo
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) krfXvQJwJ
*/ .D W>c}1
public void sort(int[] data) { o-6d$c}{f
int[] temp=new int[data.length]; `<9>X9.+
mergeSort(data,temp,0,data.length-1); LGt>=|=bj
} c`<2&ke
3y)\dln
private void mergeSort(int[] data, int[] temp, int l, int r) { 2j+w5KvU
int i, j, k; C@XS
int mid = (l + r) / 2; }xsO^K
if (l == r) vIpL8B86a
return; VKttJok1
if ((mid - l) >= THRESHOLD) m?(8T|i
mergeSort(data, temp, l, mid); [rx9gOOa&
else f=^xU
P
insertSort(data, l, mid - l + 1); NifQsy)*%
if ((r - mid) > THRESHOLD) Z8E<^<|
mergeSort(data, temp, mid + 1, r); ! VR&HEru
else 2u$-(JfoS
insertSort(data, mid + 1, r - mid); ,)`_?^\$f
%}@iz(*}>
for (i = l; i <= mid; i++) { i >3`V6
temp = data; @6UtnX'd
} a/ Ac^!(
for (j = 1; j <= r - mid; j++) { k o@ej^
temp[r - j + 1] = data[j + mid]; L"ho|v9:
} `N\ ^JAGW
int a = temp[l]; :9QU\{2
int b = temp[r]; g`pq*D
for (i = l, j = r, k = l; k <= r; k++) { mn@1c4y
if (a < b) { ZeV@ X
data[k] = temp[i++]; S"!6]!~^
a = temp; ZN8j})lE
} else { # `=Zc7gf
data[k] = temp[j--]; `4*I1WZW
b = temp[j]; :UdW4N-
} _=$~l^Y[
} ,1ev2T
} .RpJZ[E
Xmr}$<<=
/** MT/jpx
* @param data {]>c3=~FQb
* @param l [S'1OR$FQ\
* @param i SrKitSG
*/ {N~mDUoJ|
private void insertSort(int[] data, int start, int len) { TKnWhB/J
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); LtRRX@qJw
} m%L!eR
} /MtmO$.
} [~N;d9H+*1
=RWTjTZ
}