归并排序: g>lZs
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package org.rut.util.algorithm.support; '2(m%X\6
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import org.rut.util.algorithm.SortUtil; 5n@YNaoIb
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/** ZVjB$-do
* @author treeroot WXQ@kQD
* @since 2006-2-2 X6Ha C+P
* @version 1.0 02-ql
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*/ MEDh
public class MergeSort implements SortUtil.Sort{ /F0q8j0
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/* (non-Javadoc) Tq1\
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
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*/ p*
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public void sort(int[] data) { jZXa
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int[] temp=new int[data.length]; ^b8~X [1J_
mergeSort(data,temp,0,data.length-1); '}.Yf_
} 4#$#x=:
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private void mergeSort(int[] data,int[] temp,int l,int r){ TKDG+`TyZ
int mid=(l+r)/2; 4V+bE$Wu
if(l==r) return ; U+S=MP
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mergeSort(data,temp,l,mid); Ca2r<|uA
mergeSort(data,temp,mid+1,r); ?UXFz'
for(int i=l;i<=r;i++){ $RD~,<oEm
temp=data; 384n1?
} <FT7QO$I
int i1=l; _#8hgwf>
int i2=mid+1; +-izC%G
for(int cur=l;cur<=r;cur++){ `^M]|7
if(i1==mid+1) =?i?-6M
data[cur]=temp[i2++]; &jqaW2
else if(i2>r) QS#@xhH
data[cur]=temp[i1++]; KOcB#UHJ
else if(temp[i1] data[cur]=temp[i1++]; \6b~$\~B
else xl}rdnf}
data[cur]=temp[i2++]; _7c3=f83
} vX+oZj
} !cW rB9
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改进后的归并排序: -U|c~Cqc
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package org.rut.util.algorithm.support; Eb3 ZM#
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import org.rut.util.algorithm.SortUtil; oF%m
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/** N ,~O+
* @author treeroot #:)'D?,
* @since 2006-2-2 d4Uw+3ikW
* @version 1.0 j7I=2xnTWu
*/ (Y1*Bs[l
public class ImprovedMergeSort implements SortUtil.Sort { TvU
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private static final int THRESHOLD = 10; g )hEzL0k
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/*
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* (non-Javadoc) Jqoo&T")
* ^y5A\nz&
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) *D]:{#C*
*/ V)$!WPL@
public void sort(int[] data) { &V38)83a
int[] temp=new int[data.length]; }">r0v!3
mergeSort(data,temp,0,data.length-1); Y\
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} T3w%y`K
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private void mergeSort(int[] data, int[] temp, int l, int r) { =*UK!y?n
int i, j, k; )*KMU?
int mid = (l + r) / 2; -]3 K#M)s
if (l == r) >X~B1D,SV7
return; (4H\ho8+mp
if ((mid - l) >= THRESHOLD) J= A)]YE
mergeSort(data, temp, l, mid); d`sZ"8}j
else vC]X>P5 Px
insertSort(data, l, mid - l + 1); "Q: Gd6?h;
if ((r - mid) > THRESHOLD) x^s,<G
mergeSort(data, temp, mid + 1, r); f;E#CjlTL
else +d,
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insertSort(data, mid + 1, r - mid);
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for (i = l; i <= mid; i++) { EX)&|2w
temp = data; Ez1eGPVr
} 9<mMU:
for (j = 1; j <= r - mid; j++) { Wn<?_}sa|z
temp[r - j + 1] = data[j + mid]; l*ltS(?
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int a = temp[l]; f+e"`80$*C
int b = temp[r]; 1W|jC
for (i = l, j = r, k = l; k <= r; k++) { /?.?1-HM
if (a < b) { p6JTNxD
data[k] = temp[i++]; g->*@%?<w>
a = temp; AG(6.
} else { f_k'@e {
data[k] = temp[j--]; [-(^>Y
b = temp[j]; 6,t6~Uo/
} & SXw=;B
} rm-d),Zt
} 1/$PxQ
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/** c>bns/f
* @param data ! ._q8q\
* @param l &}DfIP<
* @param i 9#DXA}
*/ %A zy#m
private void insertSort(int[] data, int start, int len) { Ip8ml0oG
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); l b(
} p4T$(]7
} Q<sqlh!h
} h&4s%:_4
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}