归并排序: ~Xa >;
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package org.rut.util.algorithm.support; }6`#u:OZ
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import org.rut.util.algorithm.SortUtil; q^EG'\<^
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/** y "gYv
* @author treeroot hCM+=]z"
* @since 2006-2-2 J-b
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* @version 1.0 %G>*Pez%
*/ $33wK
public class MergeSort implements SortUtil.Sort{ C&r&&Pw
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/* (non-Javadoc) (|<}q-wO
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ONg_3vD{
*/ {o AJL
public void sort(int[] data) { o[aRG7C
int[] temp=new int[data.length]; fE,\1LK4
mergeSort(data,temp,0,data.length-1); c.r]w
} z" 4$mh
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private void mergeSort(int[] data,int[] temp,int l,int r){ -:Yx1Y3
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int mid=(l+r)/2;
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if(l==r) return ; 0rooL<~fa
mergeSort(data,temp,l,mid); _>0I9.[5
mergeSort(data,temp,mid+1,r); KftZ^mk+p
for(int i=l;i<=r;i++){ uK1DC i
temp=data; 6ID@ 0
} l.El3+
int i1=l; (6!W8x7
int i2=mid+1; !np-Jmi
for(int cur=l;cur<=r;cur++){ L~=h?C<
if(i1==mid+1) c#Y/?F2p
data[cur]=temp[i2++]; F{ v >
else if(i2>r) J.35Ad1hM
data[cur]=temp[i1++]; ?`lIsd
else if(temp[i1] data[cur]=temp[i1++]; K8daSvc
else qJj"WU5
data[cur]=temp[i2++]; 6;Wns'
}
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改进后的归并排序: y38x^fuYJ~
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package org.rut.util.algorithm.support; &C6Z-bS"
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import org.rut.util.algorithm.SortUtil; Z7J8%ywQ
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/** f@rR2xZoQ
* @author treeroot }Ox5,S}ra
* @since 2006-2-2 f:bUM/Ud
* @version 1.0 9=TjSRS
*/ N"L@
public class ImprovedMergeSort implements SortUtil.Sort { 9bwG3jn4?
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private static final int THRESHOLD = 10; |ZC@l^a7
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/* g:8k,1y5
* (non-Javadoc) v)1@Ew=Y%
* ;auT!a~a#
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) {_C2c{
*/ .Yg7V'R1
public void sort(int[] data) { 1 UdET#\
int[] temp=new int[data.length]; UXgeL2`;
mergeSort(data,temp,0,data.length-1); 'A2^K5`3
} 2Kwr=t
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private void mergeSort(int[] data, int[] temp, int l, int r) { Q!.JV.(
int i, j, k; ^Q,-4\ec
int mid = (l + r) / 2; V96:+r
if (l == r) [`(W(0U%
return; 3'2>3Y/7Bb
if ((mid - l) >= THRESHOLD) (}*1,N!#
mergeSort(data, temp, l, mid); &1 t84p:^=
else ]?c9;U
insertSort(data, l, mid - l + 1); 1{15#W
if ((r - mid) > THRESHOLD) "d"6.ND
mergeSort(data, temp, mid + 1, r); cb82k[L6
else ?vh1 >1D
insertSort(data, mid + 1, r - mid); %^pm~ck!
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for (i = l; i <= mid; i++) { uidoz
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temp = data; n~_;tO
} 6 H{G$[2
for (j = 1; j <= r - mid; j++) { nOTe 3?i>
temp[r - j + 1] = data[j + mid]; f0M5^
} <*_DC)&79
int a = temp[l]; Iw;i ".
int b = temp[r]; ?
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for (i = l, j = r, k = l; k <= r; k++) { y?OK#,j
if (a < b) { 'u}OeS"f
data[k] = temp[i++]; ze"`5z26|
a = temp; zt!)7HBo
} else { 9w!PA-) L
data[k] = temp[j--]; zoibinm}Eg
b = temp[j]; E\1e8Wyh
} _*wkTI+j
} /`s{!t#Y
} aO&!Y\=@
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/** Mh"iyDGA
* @param data <H,E1kGw9
* @param l bUU\bc
* @param i br;~}GR_h
*/ .C|dGE?,
private void insertSort(int[] data, int start, int len) { __%){j6
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); #b,!N
} rczwxWK
} f1AO<>I;
} A= 96N@m6
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}