归并排序: u8wZ2j4S
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package org.rut.util.algorithm.support; joN}N }U
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import org.rut.util.algorithm.SortUtil; +H K)A%QI
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/** <9s=K\-
* @author treeroot y ;4h'y>#
* @since 2006-2-2 cc%O35o
* @version 1.0 ($oO,
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*/ =!#iC?I
public class MergeSort implements SortUtil.Sort{ 4#qjRmt
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/* (non-Javadoc) #89h}mp'
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Bn"r;pqWiT
*/ [wM<J$=2
public void sort(int[] data) { m7XJe[O
int[] temp=new int[data.length]; a#0GmK
mergeSort(data,temp,0,data.length-1); /Jc?;@{
} |m%M$^sZ}
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private void mergeSort(int[] data,int[] temp,int l,int r){ ')9%eBaeK
int mid=(l+r)/2; @x@w<e%
if(l==r) return ; PSdH9ea
mergeSort(data,temp,l,mid); r]{fjw(~
mergeSort(data,temp,mid+1,r); lbES9o5
for(int i=l;i<=r;i++){ O^]I>A#d
temp=data; X'&$wQ6,K
} TgaDzF,j{A
int i1=l; 3"gifE
int i2=mid+1; )r2$/QF9
for(int cur=l;cur<=r;cur++){ _e.b#{=9
if(i1==mid+1) (jD..qMs#
data[cur]=temp[i2++]; T$]2U>=<J
else if(i2>r) /p
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data[cur]=temp[i1++]; 8j,_
else if(temp[i1] data[cur]=temp[i1++]; f/b }X3K
else
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data[cur]=temp[i2++]; ;UgRm#
} 6bg+U`&g
} 0NSn5Hq
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} |zu>G9m
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改进后的归并排序: v.1= TBh
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package org.rut.util.algorithm.support; yvxC/Jo4
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import org.rut.util.algorithm.SortUtil; J1<fE(X
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/** YF{K9M!
* @author treeroot -aNTFt~|[
* @since 2006-2-2 skcMGEB
* @version 1.0 x
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*/ &1Fcwj
public class ImprovedMergeSort implements SortUtil.Sort { D,eJR(5I
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private static final int THRESHOLD = 10; $EJ*x$
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/* &Jj> jCg
* (non-Javadoc) Z-<v5aF
* YeJ95\jf
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) i&,U);T
*/ T , =ga
public void sort(int[] data) { P&aH6*p1
int[] temp=new int[data.length]; DuvP3(K
mergeSort(data,temp,0,data.length-1); ud:?~?j&w
} =X X_Cnn
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private void mergeSort(int[] data, int[] temp, int l, int r) { Kc udWW]
int i, j, k; tL+8nTL
int mid = (l + r) / 2; zs"AYxr
if (l == r) >`NY[Mn
return; !E_uQ?/w]Z
if ((mid - l) >= THRESHOLD) z K8#gif@
mergeSort(data, temp, l, mid); oz5o=gt7
else UKK}$B
insertSort(data, l, mid - l + 1); M{kPEl&Z
if ((r - mid) > THRESHOLD) (P#2Am$
mergeSort(data, temp, mid + 1, r); o33{tUp'
else ,:\2Lf
insertSort(data, mid + 1, r - mid); na']{a1K
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for (i = l; i <= mid; i++) {
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temp = data; 0h shHv-
} \N#)e1.0P
for (j = 1; j <= r - mid; j++) { [bPE?_a,
temp[r - j + 1] = data[j + mid]; a`pY&xq::
} eZHzo
int a = temp[l]; H5RHA^p|
int b = temp[r]; Y)u}+Yg
for (i = l, j = r, k = l; k <= r; k++) { SbnVU[
if (a < b) { =w A< F
data[k] = temp[i++]; 0v7;ZxD
a = temp; 3/rvSR!
} else { Sw1]]-Es
data[k] = temp[j--]; N~>?w#?J
b = temp[j]; 9jPb-I-
} 2Bjp{)*
} {t/!a0\HS
} <M'IRf/D
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/** PYHm6'5BtB
* @param data $PS5xD~@
* @param l x#8=drh.:C
* @param i 4\ OELU
*/ Ok`U*j
private void insertSort(int[] data, int start, int len) { ,IJ Nuu\
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); Ee|+uQ981>
} _SP
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} 3sZK[Y|ax
} 8e\v5K9
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}