归并排序: uF-Rl##
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package org.rut.util.algorithm.support; DEpn>
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import org.rut.util.algorithm.SortUtil; /KCIb:U
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/** l`AA<Rj*O-
* @author treeroot Be0v&Q_NK
* @since 2006-2-2 |DoD.?v
* @version 1.0 &-`a`
*/ )/?s^D$,
public class MergeSort implements SortUtil.Sort{ T4"*w
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/* (non-Javadoc) jX91=78d
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 1Q??R}
*/ +0n,>eDjg^
public void sort(int[] data) { d7L|yeb"
int[] temp=new int[data.length]; ;8<lgZ9H<
mergeSort(data,temp,0,data.length-1); Kdd5ysTQ
} #TY[\$BHs
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private void mergeSort(int[] data,int[] temp,int l,int r){ [~IFg~*,
int mid=(l+r)/2; .^?Z3iA",
if(l==r) return ; 1`EkN0iZ
mergeSort(data,temp,l,mid); + WFa4NZ
mergeSort(data,temp,mid+1,r); @)S d3xw[
for(int i=l;i<=r;i++){ 0[SrRpD
temp=data; BQ77n2(@
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int i1=l; P;lDri
int i2=mid+1; >]l7AZ:,
for(int cur=l;cur<=r;cur++){ u=!n9W~"
if(i1==mid+1) <o&\/uO~H
data[cur]=temp[i2++]; $PKUcT0N9
else if(i2>r)
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data[cur]=temp[i1++]; uF\f>E)/N%
else if(temp[i1] data[cur]=temp[i1++]; l#%G~c8x
else %KmhR2v
data[cur]=temp[i2++]; )u_[cEJHO
} *[wj )
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改进后的归并排序: &<S]=\
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package org.rut.util.algorithm.support; {}v<2bS
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import org.rut.util.algorithm.SortUtil; /7XVr"R
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/** G_n~1?
* @author treeroot yM*<BV
* @since 2006-2-2 $iAd)2LT
* @version 1.0 W2j@Q=YDS
*/ C*,PH!$k
public class ImprovedMergeSort implements SortUtil.Sort { _8nT$!\\
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private static final int THRESHOLD = 10; dRnO5
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/* 3D"?|rd~
* (non-Javadoc) Av^<_`L:
* k8ej.
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) p3z%Y$!Tm
*/ I=Xj;\b
public void sort(int[] data) { d7Devs
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int[] temp=new int[data.length]; %W]"JwRu
mergeSort(data,temp,0,data.length-1); ^G]H9qY-e
} D<XRu4^;
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private void mergeSort(int[] data, int[] temp, int l, int r) { /2e,,)4g
int i, j, k; dW>$C_`?
int mid = (l + r) / 2; ;tu2}1#r
if (l == r) ?>o|H-R~5Z
return; +c_8~C
if ((mid - l) >= THRESHOLD) uNRT@@oCq
mergeSort(data, temp, l, mid); / :@X<
else #^&.*'z%z
insertSort(data, l, mid - l + 1); "f<+~
if ((r - mid) > THRESHOLD) 8ORr
mergeSort(data, temp, mid + 1, r); 5Dlx]_
else aXO|%qX
insertSort(data, mid + 1, r - mid); /0I=?+QSo
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for (i = l; i <= mid; i++) { xK C{P{:
temp = data; @Tg +Kt
} eMV@er|
for (j = 1; j <= r - mid; j++) { 8|iMD1
temp[r - j + 1] = data[j + mid]; sz+Uq]Mn
} VyL|d^'f_
int a = temp[l]; J?N9*ap)
int b = temp[r]; o@g/,V $
for (i = l, j = r, k = l; k <= r; k++) { s.G6?1VXlY
if (a < b) {
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data[k] = temp[i++];
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a = temp; w_eUU)z
} else { o|0QstSCl
data[k] = temp[j--]; [O"8Tzr
b = temp[j]; =3?"s(9
} ]w[T_4l
} Kp_^ 2V?
} fnm:Wa|,%|
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/** vs~lyM/
* @param data PofHe
* @param l \9t6#8
* @param i /i)1BaF
*/ nmrYB w>
private void insertSort(int[] data, int start, int len) { %[C-KQH
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 3V`.<
} _z3YB
} 4C{3>BE
} edy6WzxBcm
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}