归并排序: S&_03
}QFL
package org.rut.util.algorithm.support; *;fTiL
LwC?t3n
import org.rut.util.algorithm.SortUtil; 1dQAo1
A2|Bbqd
/** Z hfp>D
* @author treeroot JQV%W+-@
* @since 2006-2-2 y, l[v39
* @version 1.0 j&8YE7
*/ UP-eKK'z
public class MergeSort implements SortUtil.Sort{ hX.cdt_?
1bFZyD"
/* (non-Javadoc) 4uXGpsL
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) h`&TDB2
*/ %xkuW]xk
public void sort(int[] data) { v;(cJ,l
int[] temp=new int[data.length]; Zux L2W
mergeSort(data,temp,0,data.length-1); Fp.eucRxP
} `wi+/^);
LphCx6f,X
private void mergeSort(int[] data,int[] temp,int l,int r){ h% -=8l,
int mid=(l+r)/2; mS%4
if(l==r) return ; +L 09^I
mergeSort(data,temp,l,mid); MV5$e
mergeSort(data,temp,mid+1,r); D[>:az`
for(int i=l;i<=r;i++){ 3o rSk
temp=data; G? SPz
} \n}%RD-Ce
int i1=l; \#[DZOI~
int i2=mid+1; c44s@E
for(int cur=l;cur<=r;cur++){ g0 Q,]\~
if(i1==mid+1) (6fD5XtS
data[cur]=temp[i2++];
nS]e
else if(i2>r) KcT(/!
data[cur]=temp[i1++]; DcxT6[
else if(temp[i1] data[cur]=temp[i1++]; x1~AY/)v
else MgiW9@_(
data[cur]=temp[i2++]; 1#Vd)vSP
} +=W(c8~P
} D&fOZVuqZ
|K.I%B
} PVi;h%>Y
);HhV,$n
改进后的归并排序: 1!zd#TX
\>\ERVEd
package org.rut.util.algorithm.support; ^4IJL",
6(7
56
import org.rut.util.algorithm.SortUtil; /\,3AInLb
LTf)`SN %'
/** p63fpnH
* @author treeroot %S%UMA.
* @since 2006-2-2 =Fe4-B?I
* @version 1.0 SOPair <r
*/ |7K>`
public class ImprovedMergeSort implements SortUtil.Sort { |QZ
E
~APS_iG[
private static final int THRESHOLD = 10; ?yG[VW
#)L}{mHLM-
/* {*;K>%r\o
* (non-Javadoc) 6lpJ+A57#
* n3?
msY(*
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 3K||(
*/ InL_JobE8r
public void sort(int[] data) { E#d~.#uH
int[] temp=new int[data.length]; Xtz29
mergeSort(data,temp,0,data.length-1); sMLXn]m
} I@qGDKz;
2asRJ97qES
private void mergeSort(int[] data, int[] temp, int l, int r) { ]*MVC/R,
int i, j, k; pq_U?_5Z'r
int mid = (l + r) / 2; AP`1hz4].-
if (l == r) !5'4FUlJ
return; IPn!iv)
if ((mid - l) >= THRESHOLD) e2fv%
mergeSort(data, temp, l, mid); EajJv>X7
else ]>Dbta.27
insertSort(data, l, mid - l + 1); P(-
if ((r - mid) > THRESHOLD) EhKG"Lb+
mergeSort(data, temp, mid + 1, r); =i}lh}(
else !ni
1 qM
insertSort(data, mid + 1, r - mid); ;Y8>?
8*Fn02 p
for (i = l; i <= mid; i++) { h=6D=6c
temp = data; q77qdmq7
} FzSL[S4i
for (j = 1; j <= r - mid; j++) { O46v
temp[r - j + 1] = data[j + mid]; LRaO}-<b
} !5h8sD;
int a = temp[l]; I5QtPqB>
int b = temp[r]; `t9k!y!GV
for (i = l, j = r, k = l; k <= r; k++) { CY.92I@S
if (a < b) { >S0kiGDV{
data[k] = temp[i++]; F+NX
[
a = temp; ;"#y HP`
} else { @d^DU5ats>
data[k] = temp[j--]; Xf"<
>M
b = temp[j]; F/1m&1t
} 0 ;)Q
} _E8Cvaob
} k{S8q?Gc
@(*A<2;N
/** $0OOH4
* @param data G; exH$y
* @param l r|]YS6
* @param i HCkfw+gaV
*/ ]t&^o**
private void insertSort(int[] data, int start, int len) { aO(iKlZ$
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); Qv'x+GVW]
} }CZw'fhVWO
} O&y`:#
} }kItVx
K1R?Qt,qDF
}