归并排序: X1U7$/t
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package org.rut.util.algorithm.support; f!;i$Oif
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import org.rut.util.algorithm.SortUtil; !}wJ+R ^2
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/** U#G[#sd> K
* @author treeroot j"o`K}C
* @since 2006-2-2 J 2%^%5&0
* @version 1.0 dDN#>|
*/ +7?p&-r)x
public class MergeSort implements SortUtil.Sort{ mfOr+
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/* (non-Javadoc) /km^IH
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) s~Wj h7'
*/ {\22C `9t
public void sort(int[] data) { B]dHMLzl
int[] temp=new int[data.length];
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mergeSort(data,temp,0,data.length-1); "UVqkw,vt
} DUf=\p6`f
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private void mergeSort(int[] data,int[] temp,int l,int r){ quc?]rb
int mid=(l+r)/2; vPEL'mw/3#
if(l==r) return ; 9Ue3
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mergeSort(data,temp,l,mid); q@;WXH O0
mergeSort(data,temp,mid+1,r); a?6
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for(int i=l;i<=r;i++){ j>~^jz:
temp=data; uy\<t
} Z!=/[,b
int i1=l; P\;lH"9
int i2=mid+1; B&A4-w v
for(int cur=l;cur<=r;cur++){ Mt)~:V+:
if(i1==mid+1) 8'J>@ uW
data[cur]=temp[i2++]; #(3w6l2
else if(i2>r) &
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data[cur]=temp[i1++]; \~:Kp
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else if(temp[i1] data[cur]=temp[i1++]; 3:jKuOX
else A<^IG+Q,B7
data[cur]=temp[i2++]; /3:R{9S%
} BDZB;DPb
} eKn&`\j6
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} b_-ESs]g
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改进后的归并排序: E&V"z^qs_
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package org.rut.util.algorithm.support; pI7\]e
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import org.rut.util.algorithm.SortUtil; @PuJre4!;L
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/** bs
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* @author treeroot t/WauY2JUC
* @since 2006-2-2 '-3AWBWI1
* @version 1.0 qC?J`
*/ ]O',Ei^
public class ImprovedMergeSort implements SortUtil.Sort { ntkTrei
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private static final int THRESHOLD = 10; K"Vv=
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/* k\|G%0Jw
* (non-Javadoc) <aa#OX
* Nkn0G_
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) `,H\j?
*/ 5%(J +d
public void sort(int[] data) { Gm^@lWzG
int[] temp=new int[data.length]; EU]{S=T
mergeSort(data,temp,0,data.length-1); H,txbJ
} X;flA*6V
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private void mergeSort(int[] data, int[] temp, int l, int r) { GdEkA
int i, j, k; t5N@z
int mid = (l + r) / 2; 84)$ CA+NX
if (l == r) 3v;o`Em&
return; ??12
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if ((mid - l) >= THRESHOLD) 0!veLXeK!
mergeSort(data, temp, l, mid); zkn K2e,$
else AuUT 'E@E
insertSort(data, l, mid - l + 1); @Ek''a$
if ((r - mid) > THRESHOLD) m9ts&b+TE
mergeSort(data, temp, mid + 1, r); F6h3M~uR
else *c7kB}/
insertSort(data, mid + 1, r - mid); %]nYv#K
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for (i = l; i <= mid; i++) { ,0NVb7F;k
temp = data; rZ 9bz}K
} Fwyv>U
for (j = 1; j <= r - mid; j++) { ^Tc&?\3
temp[r - j + 1] = data[j + mid]; KCJ zE>
} 1qbd6D|t
int a = temp[l]; (7`goi7M
int b = temp[r]; GjE/!6b
for (i = l, j = r, k = l; k <= r; k++) { |M#b`g$JO,
if (a < b) { P482D)
data[k] = temp[i++]; '?t]iRCeI7
a = temp; QZef=
} else { }M?GqA=
data[k] = temp[j--]; sY7:Lzs.,
b = temp[j]; ma@ws,H
} rJ ?Y~Q
} mm/U9hbp%
} I?dh"*Js&
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/** xb0hJ~e
* @param data ^tsIgK^9H
* @param l *!%y.$\cE
* @param i vi@a87w>
*/ Ttn=VX{
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private void insertSort(int[] data, int start, int len) { ^~-i>gTD
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); I!9u](\0
} ]0by6hQ
} cf1Ve\(YGI
} 'Kxs>/y3
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}