归并排序: 7; e$ sr
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package org.rut.util.algorithm.support; UfWn\*J&k
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import org.rut.util.algorithm.SortUtil; yMoV|U6
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/** O W|5IEC
* @author treeroot da/Tms`T
* @since 2006-2-2 yhpeP
* @version 1.0 p\ }Ep
*/ vz-O2B_u
public class MergeSort implements SortUtil.Sort{ $+$S}i=
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/* (non-Javadoc) ?|;q=p`t-
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) vRQ7=N{3
*/ ',Q|g^rF]
public void sort(int[] data) { NP#:} )
int[] temp=new int[data.length]; 86AZ)UP2D
mergeSort(data,temp,0,data.length-1); 7}2Aq
} B<" `<oG@|
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private void mergeSort(int[] data,int[] temp,int l,int r){ ,s9gGCA
int mid=(l+r)/2; A3|hFk
if(l==r) return ; :_f5(N*{5o
mergeSort(data,temp,l,mid); Y 3 QrD&V
mergeSort(data,temp,mid+1,r); 2aR<xcSg
for(int i=l;i<=r;i++){ c?0.>^,B Q
temp=data; o'SZsG
} AYP*J
int i1=l; t.`&Q|a
int i2=mid+1; Q`kJ3b
for(int cur=l;cur<=r;cur++){ v?=y9lEH@%
if(i1==mid+1) #oX8EMqs<
data[cur]=temp[i2++]; XDdF7i}
else if(i2>r) i l5Qo
data[cur]=temp[i1++]; DQy<!Wb+
else if(temp[i1] data[cur]=temp[i1++]; bk}'wcX<+]
else p9`!.~[
data[cur]=temp[i2++]; {%b*4x0?
} zv8AvNDK
} [PW\l+i
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} 15X.gx
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改进后的归并排序: 1z5Oi u
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package org.rut.util.algorithm.support; U7do,jCoa
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import org.rut.util.algorithm.SortUtil; MoX~ZewWR
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/** ,ut-Di=6
* @author treeroot CVt:tV
* @since 2006-2-2 n LD1j
* @version 1.0 z*FCd6X
*/ cM hBOm*
public class ImprovedMergeSort implements SortUtil.Sort { E;tEmGf6F
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private static final int THRESHOLD = 10; !jTtMx
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/* :2zga=)g
* (non-Javadoc) BH"OphE
* h%%ryQQ&<
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) J6[V7R[\
*/ {KGEv%
public void sort(int[] data) { tSVWO]<
int[] temp=new int[data.length]; [Xyu_I-c
mergeSort(data,temp,0,data.length-1); U5RLM_a@M
} >_J9D?3S
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private void mergeSort(int[] data, int[] temp, int l, int r) { $Vp*,oRL
int i, j, k; .US=fWyrb
int mid = (l + r) / 2; ~~\C.6c#
if (l == r) H-&T)
return; v6C$Y+5~
if ((mid - l) >= THRESHOLD) n muzTFs=
mergeSort(data, temp, l, mid); 9,wD
else .sCj3sX*
insertSort(data, l, mid - l + 1); VtN1 [}
if ((r - mid) > THRESHOLD) \'Q rJ ?D
mergeSort(data, temp, mid + 1, r); CBr(a'3{Z
else 3%[;nhbA7
insertSort(data, mid + 1, r - mid); g2;lEW
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for (i = l; i <= mid; i++) { #PkZi(k
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temp = data; &"r /&7:
} W=:AOBK
for (j = 1; j <= r - mid; j++) { C<Z{G%Qm
temp[r - j + 1] = data[j + mid]; abD@0zr
} lDSF
int a = temp[l]; 5MCnGg@
int b = temp[r]; ve]hE}o/}
for (i = l, j = r, k = l; k <= r; k++) { dfP4SJqq
if (a < b) { @9tzk [
data[k] = temp[i++]; <I#nwoHN
a = temp; w7@TM%nS
} else { 85T"(HhT
data[k] = temp[j--]; yT~rql
b = temp[j]; -|GKtZ]}
} uCr :+"C
} ?o6X_UxW!
} M>_vsI^I'
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/** QR2S67-
* @param data ~].?8C.>*
* @param l
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* @param i Qhq' %LR
*/ 3_ly"\I\
private void insertSort(int[] data, int start, int len) { "ze-Mb
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); } J[Z)u
} 4_`(c1oA
} 1Q/=s,{u
} Kh$Q9$
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}