归并排序: "nno)~)u
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package org.rut.util.algorithm.support; %H@76NvEz
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import org.rut.util.algorithm.SortUtil; WcO,4:
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/** bXwoJ2
* @author treeroot .r5oN +?e
* @since 2006-2-2 .4FcZJvy
* @version 1.0 XuoEAu8]
*/ |;m`874
public class MergeSort implements SortUtil.Sort{ 0DVZRB
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/* (non-Javadoc) cievC,3*
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) CN~NyJL H
*/ PFy;qk
public void sort(int[] data) { 65#:2,s
int[] temp=new int[data.length]; ?VP!1O=J
mergeSort(data,temp,0,data.length-1); /
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} \R\@t]>Y
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private void mergeSort(int[] data,int[] temp,int l,int r){ .`>l.gmi&
int mid=(l+r)/2; q,+kPhHEgy
if(l==r) return ; (e3Gs+;
mergeSort(data,temp,l,mid); TT ZxkK
mergeSort(data,temp,mid+1,r); F*JvpI[7n
for(int i=l;i<=r;i++){ (2bZ]
temp=data; !aw#',r8m
} N^(lUba
int i1=l; l()MYuLNV
int i2=mid+1; 2, "q_d'V
for(int cur=l;cur<=r;cur++){ o?mXxL)
if(i1==mid+1) N46$EsO!h
data[cur]=temp[i2++]; vd7N&c9
else if(i2>r) 0$L0fhw.
data[cur]=temp[i1++]; !_-sTZ
else if(temp[i1] data[cur]=temp[i1++]; 795Jwv
else .A7tq
data[cur]=temp[i2++]; R 4$Q3vcH
} ~K-*q{6Q
} ;s\;78`0
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} 3R%UPT0>
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改进后的归并排序: ) Zb`~w
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package org.rut.util.algorithm.support; Wd`
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import org.rut.util.algorithm.SortUtil; ]8m_* I!
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/** Uy59zB2|=
* @author treeroot Ly)(_Tp@+
* @since 2006-2-2 nJ*mEB
* @version 1.0 :x""E5H
*/ 33<fN:J]f
public class ImprovedMergeSort implements SortUtil.Sort { jxnQG A
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private static final int THRESHOLD = 10; }xf='lE
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/* cF_;hD|YZ
* (non-Javadoc) 3cCK"kr
* E +Ujpd
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) !
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*/ ,zN3? /7
public void sort(int[] data) { p`ADro*
int[] temp=new int[data.length]; %|*nmIPq(
mergeSort(data,temp,0,data.length-1); fys5-1@-p
} XJmFJafQD
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private void mergeSort(int[] data, int[] temp, int l, int r) { uS,p|}Q&
int i, j, k; N4a`8dS|
int mid = (l + r) / 2; !_U37Uj<m
if (l == r)
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return; DIG0:)4R.
if ((mid - l) >= THRESHOLD) q}<.x8\
mergeSort(data, temp, l, mid); 2#AeN6\@
else &0+x2e)7g
insertSort(data, l, mid - l + 1); ShWHHU(QQ
if ((r - mid) > THRESHOLD) I%}L@fZ
mergeSort(data, temp, mid + 1, r); b|sc'eP#?
else -XBKOybHBO
insertSort(data, mid + 1, r - mid); qnq%mwDeD
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for (i = l; i <= mid; i++) { ptV4s=G2
temp = data; Yzj%{fkh
} IjG5X[@
for (j = 1; j <= r - mid; j++) { p-5Pas
temp[r - j + 1] = data[j + mid]; b:P\=k]8#
} kqVg2#<@M
int a = temp[l]; m<FF$pTT
int b = temp[r]; LkJ$aW/
for (i = l, j = r, k = l; k <= r; k++) { O9t=lrYV!
if (a < b) { r=fE8[,
data[k] = temp[i++]; AH&9Nye8
a = temp; xi680'
} else { >vlQ|/C
data[k] = temp[j--]; t|;%DA)fjw
b = temp[j]; [AXsnpa/C
} Z0e-W:&;kF
} <9ma(PFa
} C
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/** f5@.^hi[
* @param data DVObrL)znL
* @param l S?*^>Y-e;
* @param i ( "_Q
*/ !xkj30O(G
private void insertSort(int[] data, int start, int len) { 'sj9[o@]
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); sf Dg/ a
} &&;ex9
} P?^JPbfV
} mT96]V\
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}