归并排序: ~8tb^
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package org.rut.util.algorithm.support; MVkO >s
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import org.rut.util.algorithm.SortUtil; s#>``E!
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/** k:DAko}
* @author treeroot C^fUhLVSZ^
* @since 2006-2-2 ;%mYsQ
* @version 1.0 8m*uT< 5D
*/ h
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public class MergeSort implements SortUtil.Sort{ \(;X3h
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/* (non-Javadoc) EZ)$lw/!J
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) M]uO%2
*/ I%tJLdL
public void sort(int[] data) { :>o2UH
int[] temp=new int[data.length]; !8}x6
mergeSort(data,temp,0,data.length-1); m!sMr^W
} E3d# T
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private void mergeSort(int[] data,int[] temp,int l,int r){ (0!U,8zz
int mid=(l+r)/2; &uLC{Ik}
if(l==r) return ; ~@ML>z7
mergeSort(data,temp,l,mid); l g43
mergeSort(data,temp,mid+1,r); w;]~2$
for(int i=l;i<=r;i++){ ]:n! \G
temp=data; hWAZP=H
} !_pryNcb
int i1=l; V)3S.*]
int i2=mid+1; ]vUTb9>{?
for(int cur=l;cur<=r;cur++){ cwBf((~
if(i1==mid+1) J`[He$7)
data[cur]=temp[i2++]; I3" GGp3L
else if(i2>r) xO<Uz"R
data[cur]=temp[i1++]; &\
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else if(temp[i1] data[cur]=temp[i1++]; *Ry{}|_8
else 8jjq)d4#
data[cur]=temp[i2++]; 97\9!)`,
} f{ER]U
} a9niXy}a(
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改进后的归并排序: =plU3D2
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package org.rut.util.algorithm.support; m)"wd$O^w
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import org.rut.util.algorithm.SortUtil; RJ~I?{yR0[
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/** MClvmv^
* @author treeroot ,Vr'F
* @since 2006-2-2 HV\l86}
* @version 1.0 u
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*/ ctT6va
public class ImprovedMergeSort implements SortUtil.Sort { pHv~^L%=
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private static final int THRESHOLD = 10; $^louas&
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/* 5~E'21hJ
* (non-Javadoc) B<6Ye9zuG
* \zv?r:1t
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) d!#qBn$*[
*/ Gb_y"rx?0
public void sort(int[] data) { Hl b%/&
int[] temp=new int[data.length]; $|n#L6k
mergeSort(data,temp,0,data.length-1); +9[s(E?SY
} " twq#Alx
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private void mergeSort(int[] data, int[] temp, int l, int r) { >q^l
int i, j, k;
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int mid = (l + r) / 2; qgk6 \&K[
if (l == r) %eQw\o,a
return; `AcT}.u
if ((mid - l) >= THRESHOLD) W=ar&O~}n
mergeSort(data, temp, l, mid); uBqZ62{G
else AD4Ot5
insertSort(data, l, mid - l + 1); *Rj(~Q/t
if ((r - mid) > THRESHOLD) sJB::6+1(|
mergeSort(data, temp, mid + 1, r); >uVr;,=y
else 1Aw/-FxJ
insertSort(data, mid + 1, r - mid); #azD&6`
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for (i = l; i <= mid; i++) { uwhb-.w
temp = data; :Miri_l
} 9Netnzv%
for (j = 1; j <= r - mid; j++) { @-G^Jm9~\m
temp[r - j + 1] = data[j + mid]; ZI NqIfc
} iR6w)
int a = temp[l]; Y!nxHRE
int b = temp[r]; ! C|VX,w
for (i = l, j = r, k = l; k <= r; k++) { a^QyYX}\qR
if (a < b) { w;4FN'
data[k] = temp[i++]; 8oVQ:' 6
a = temp; q;L~5q."E
} else { ^L +@oS
data[k] = temp[j--]; 5V"g,]'Nd
b = temp[j]; +ht{ARX2(
} `D9AtN] R
} ^*A8 NdaB
} ncCgc5uP
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/** Fg<rz&MR
* @param data OD`?BM
* @param l :qL1jnR^
* @param i ;8J+Q0V
*/ 60@]^g;$I
private void insertSort(int[] data, int start, int len) { 1Kc[).O1
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); `/\Z{j0_
} DU=rsePWE
} P_8z'pYd>
} KOHYeiry~A
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}