归并排序: $^Ca:duk
B| Q6!
package org.rut.util.algorithm.support; rl|Q)A{
~t9Mh^gij
import org.rut.util.algorithm.SortUtil; ? ICDIn
/J;]u3e|
/** qeMv
Vf
* @author treeroot od,tfLw4
* @since 2006-2-2 p\+6"28{_~
* @version 1.0 ~V$ f#X
*/ @"8~Y|L93
public class MergeSort implements SortUtil.Sort{ 8_iHVc;<
t F/nah
/* (non-Javadoc) .&(8(C
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) W uf/LKj
*/ 2v\W1VF
public void sort(int[] data) { 9Dq.lr^
int[] temp=new int[data.length]; (C~dkR?
mergeSort(data,temp,0,data.length-1); (rMZ
} 2f`xHI/@fj
>a9l>9fyY
private void mergeSort(int[] data,int[] temp,int l,int r){ -kc(u1!
int mid=(l+r)/2; qC.i6IL
if(l==r) return ; 0Bu*g LY
mergeSort(data,temp,l,mid); NUu;tjt:
mergeSort(data,temp,mid+1,r); LR\zy8y]
for(int i=l;i<=r;i++){ :A*0 ]X;
temp=data; qT0_L
} YZ*{^'
int i1=l; qvTJ>FILT
int i2=mid+1; lWlUWhLnP
for(int cur=l;cur<=r;cur++){ jZ/+~{<
if(i1==mid+1) 0s!N@ ,T
data[cur]=temp[i2++]; m >hovikY*
else if(i2>r) R.UumBM
data[cur]=temp[i1++]; k.{G&]r{
else if(temp[i1] data[cur]=temp[i1++]; }s6G!v^2""
else ;/aB)JZ5=
data[cur]=temp[i2++]; O=`o'%K<
} Gt5$6>A
} @tQ2E}psP,
e/P4mc)
} b_mWu@$
2*YP"Ryh
改进后的归并排序: \6 LcV ik
{9'hOi50
package org.rut.util.algorithm.support; :f]!O@.~
J=VyyUB
import org.rut.util.algorithm.SortUtil; 2mq%|VG'
kDg{>mf
/** IrUi
Eq
* @author treeroot dh?S[|='
* @since 2006-2-2 4[xA-
\
* @version 1.0 !*8#jy
*/ 1{7_ `[
public class ImprovedMergeSort implements SortUtil.Sort { RSFJu\0}N
-Y2&A$cM
private static final int THRESHOLD = 10; sM0c#YK?
h^v9|~ZJ'7
/* F*X%N_n
* (non-Javadoc) 6yp+h
* 9Yd-m
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) j^rYFS
w:Q
*/ Jtpa@!M
public void sort(int[] data) { Kj=;>u
int[] temp=new int[data.length]; 8`DO[Z
mergeSort(data,temp,0,data.length-1); pB[%:w/@l:
} Q{8qm<0g
SUo^c1)G
private void mergeSort(int[] data, int[] temp, int l, int r) { rEg+i@~
int i, j, k; <gR`)YF7
int mid = (l + r) / 2; 8 `o{b"l+
if (l == r) Gk{W:866
return; V!H(;Tuuo
if ((mid - l) >= THRESHOLD) |O%:P}6c
mergeSort(data, temp, l, mid); O<bDU0s{M
else z,M'Tr.1|
insertSort(data, l, mid - l + 1); n~9 i^
if ((r - mid) > THRESHOLD) nxD'r
mergeSort(data, temp, mid + 1, r); tb:
else _,t&C7Yf;
insertSort(data, mid + 1, r - mid); M,ppCHy/$
?C
FS}v
for (i = l; i <= mid; i++) { l~ CZW*/
temp = data; I>d I[U
} Wf_CR(
for (j = 1; j <= r - mid; j++) { |}%(6<
temp[r - j + 1] = data[j + mid]; v?FhG
b~1
} m&,bC)}
int a = temp[l]; #!wsD7;
int b = temp[r]; m\1VF\
for (i = l, j = r, k = l; k <= r; k++) { ~NA1SZ{Y+
if (a < b) { _jiQL66pY
data[k] = temp[i++]; 4Fh&V{`W
a = temp; `3]Rg0g&Xe
} else { dG"K/|
data[k] = temp[j--]; $R8>u#K!
b = temp[j]; SHytyd
} Q
+R3H,
} U2VV[e)Z!
} (21']x
zUNH8=U
/** ~v^%ze
* @param data Ri9Kr
* @param l id3)6}
* @param i 56"#Syj
*/ / *AJ+K._
private void insertSort(int[] data, int start, int len) { poTl|y @
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); bkxk
i@t
} ?rky6
} ]Jja
} IkiQOk
!T)T_P[
}