归并排序: I>\}}!
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package org.rut.util.algorithm.support; 0:s8o@}
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import org.rut.util.algorithm.SortUtil; $,g 3*A
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/** ,b.kw}k
* @author treeroot e
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* @since 2006-2-2 ?!R%o
* @version 1.0 v]l&dgoT
*/ xu`d`!Tx
public class MergeSort implements SortUtil.Sort{ !'Gb$l!
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/* (non-Javadoc) :~-)Sm+^
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) gD,A9a(3
*/ }k4`
public void sort(int[] data) { 4S^
int[] temp=new int[data.length]; h5<T.vV
mergeSort(data,temp,0,data.length-1); ?G2qlna
} S83]O!w0
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private void mergeSort(int[] data,int[] temp,int l,int r){ ScM}m
int mid=(l+r)/2; ^)(G(=-Rf
if(l==r) return ; cw*(L5bu
mergeSort(data,temp,l,mid); F+lm [4n
mergeSort(data,temp,mid+1,r); D!81(}p
for(int i=l;i<=r;i++){ g%@]z8L
temp=data; de*,MkZN
} Lw!?T(SK
int i1=l; 50}.Xm@,BO
int i2=mid+1; p,3go[9X:R
for(int cur=l;cur<=r;cur++){ K7)j
if(i1==mid+1) 0+$hkd n
data[cur]=temp[i2++]; wghFGHgw
else if(i2>r) CnM+HN30o
data[cur]=temp[i1++]; FKDamHL<
else if(temp[i1] data[cur]=temp[i1++]; DQL06`pX/
else R^mu%dw)(%
data[cur]=temp[i2++]; qk"oFP6
} TmRrub
} 9q@z[+X
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} PV5TG39qQ
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改进后的归并排序: 1t~S3Q||>]
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package org.rut.util.algorithm.support; {9m!UlTtw
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import org.rut.util.algorithm.SortUtil; Vq)|gF[6i
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/** J
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* @author treeroot ;XKo44%
* @since 2006-2-2 p``;!3~~
* @version 1.0 `uaD.m$EJ
*/ os"[Iji
public class ImprovedMergeSort implements SortUtil.Sort { `-9*@_-=M
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private static final int THRESHOLD = 10; )Rm
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/* ~L4*b*W
* (non-Javadoc) F$sF
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* 2F*Dkv
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
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*/ `o^;fcnG
public void sort(int[] data) { /4wm}g9
int[] temp=new int[data.length]; #1,>Qnl
mergeSort(data,temp,0,data.length-1); ~(l2%(3G
} l/y
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private void mergeSort(int[] data, int[] temp, int l, int r) { ]C!Y~
int i, j, k; -G^t-I
int mid = (l + r) / 2; YiQeI|{oN
if (l == r) #ZYidt
return; 4Q`=t&u
if ((mid - l) >= THRESHOLD) kVG6\<c]
mergeSort(data, temp, l, mid); %RT6~0z
else )T$fk
insertSort(data, l, mid - l + 1); /Mi-lh^j-
if ((r - mid) > THRESHOLD) [/fwt!
mergeSort(data, temp, mid + 1, r); Z%HEn$t
else #G4~]Qml
insertSort(data, mid + 1, r - mid); 0z'={6,
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for (i = l; i <= mid; i++) { CrwcYzrRWl
temp = data; gQ@Pw4bA
} UV
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for (j = 1; j <= r - mid; j++) { _.J[w6
temp[r - j + 1] = data[j + mid]; Q\/":ISq1
} }9+1<mT9a/
int a = temp[l]; E 4$h%5
int b = temp[r]; JXy667_
for (i = l, j = r, k = l; k <= r; k++) {
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if (a < b) { S1^Mw;?P
data[k] = temp[i++]; @ !O&b%8X%
a = temp; )hZ}$P1
} else { DRg~HT
data[k] = temp[j--]; [,szx1
b = temp[j]; 3TvhOC>yG
} +Tc(z{;
} CO)b'V,
} m$y$wo<K[7
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/** o)'=D(
* @param data ;KZ2L~
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* @param l ^{sI'l~
* @param i Ckl]fy@D}
*/ qx<zX\qI6n
private void insertSort(int[] data, int start, int len) { Y(!)G!CMc
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); sbiDnRf
} 2Lu{@*
} _itN.^
} "BNmpP
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}