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package org.rut.util.algorithm.support; {1jywb
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import org.rut.util.algorithm.SortUtil; s3.,
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/**
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* @author treeroot |ULwUi-r
* @since 2006-2-2 1zz.`.R2U
* @version 1.0 eqFOPK5q
*/ a%h'utF{[
public class MergeSort implements SortUtil.Sort{ #_zd`s3k
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/* (non-Javadoc) C6"bGA
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 4Pm+0=E
*/ Aj22t
public void sort(int[] data) { WecJ^{g>r{
int[] temp=new int[data.length]; *C 0gpEf9S
mergeSort(data,temp,0,data.length-1); CYxrKW
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} S dI/
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private void mergeSort(int[] data,int[] temp,int l,int r){ <;?&<qMo,P
int mid=(l+r)/2; ilyQgEjC
if(l==r) return ; ,;_D~7L
mergeSort(data,temp,l,mid); N,><,7!q$,
mergeSort(data,temp,mid+1,r); 0 CJ4]mYl
for(int i=l;i<=r;i++){ ji &*0GJQ
temp=data; )kE(%q:*P$
} #=MQE
int i1=l; h0N*hx
int i2=mid+1; d\cwUXf
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for(int cur=l;cur<=r;cur++){ ,0~/ Cn
if(i1==mid+1) M~G1ZB
data[cur]=temp[i2++]; SwDUg}M~
else if(i2>r) {mlJ E>~%
data[cur]=temp[i1++]; i>M*ubWE4@
else if(temp[i1] data[cur]=temp[i1++]; :EUV#5V.
else .%@=,+nqz
data[cur]=temp[i2++]; oc2aE:>X
} h)M9Oup`
} Kk^tQwj/QE
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} mndUQN_Gb
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改进后的归并排序: N1V qK
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package org.rut.util.algorithm.support; J)l]<##
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import org.rut.util.algorithm.SortUtil; VH{SE7
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/** >e4
* @author treeroot {d;eZt
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* @since 2006-2-2 ,]N!I%SI
* @version 1.0 d E@R7yU@
*/ `;^% t
public class ImprovedMergeSort implements SortUtil.Sort { @UO=)PxN3
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private static final int THRESHOLD = 10; Cf_Ik
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/* #"M 'Cs
* (non-Javadoc) C/P,W>8
* {C%/>e2-%
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) N_vVEIO9
*/ %@!Vx
public void sort(int[] data) { HY]vaA`
int[] temp=new int[data.length]; 5k`[a93T
mergeSort(data,temp,0,data.length-1); F_SkS?dB
} tVhY=X{N?
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private void mergeSort(int[] data, int[] temp, int l, int r) { I +,D,Vg
int i, j, k; S?{|qlpy
int mid = (l + r) / 2; Sa&~\!0t
if (l == r)
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return; |Hbe]2"x>
if ((mid - l) >= THRESHOLD) cJ&e^$:Er
mergeSort(data, temp, l, mid); Ii?"`d +JA
else .P=uR8
insertSort(data, l, mid - l + 1); 9?*BN\E5S
if ((r - mid) > THRESHOLD) 'aB0abr|
mergeSort(data, temp, mid + 1, r); o} #nf$v(
else S.+)">buH
insertSort(data, mid + 1, r - mid); V*l0|,9
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for (i = l; i <= mid; i++) { ~'WvIA
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temp = data; ufdC'2cp8
} DytOS}/^9
for (j = 1; j <= r - mid; j++) { LnJ/t(KV
temp[r - j + 1] = data[j + mid]; DA
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} :):=KowI
int a = temp[l]; ,q#^_/?
int b = temp[r]; ]xfAdBi
for (i = l, j = r, k = l; k <= r; k++) { r*/Pyh
if (a < b) { !oU$(,#9
data[k] = temp[i++]; SaEe7eHd
a = temp; 's$pr#V
} else { SVp]}!jI
data[k] = temp[j--]; L%a ni}V
b = temp[j]; xPh%?j?*v
} +G&h
} (
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} 'uUp1+
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/** $ 8w
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* @param data =JyYU*G4
* @param l )2oWoZvi9
* @param i |xH"Xvp:
*/ J`O4]XRY
private void insertSort(int[] data, int start, int len) { 1!\!3xa V
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); )J_!ZpMC
} rsfA.o
} K0]'v>AWr
} OgrUP
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}