归并排序: M%E<]H2;S
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package org.rut.util.algorithm.support; r8 9o
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import org.rut.util.algorithm.SortUtil; eoiz]L
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/** +[76 _EXy
* @author treeroot +>PsQ^^x
* @since 2006-2-2 sxT&T=7
* @version 1.0 o`YBz~2
*/ m.D8@[y
public class MergeSort implements SortUtil.Sort{ aE~T!h
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/* (non-Javadoc) tVG;A&\,6
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) i-|N6J
*/ VhO+nvd*W
public void sort(int[] data) { )LGVR3#
int[] temp=new int[data.length]; . 1kB8&}
mergeSort(data,temp,0,data.length-1); ,U""m7
} Lm[,^k
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private void mergeSort(int[] data,int[] temp,int l,int r){ ad}8~6}_&
int mid=(l+r)/2; 71{Q#%5U~
if(l==r) return ; 3Q,&D'];[
mergeSort(data,temp,l,mid); pS$9mzY
mergeSort(data,temp,mid+1,r); ,C,nNaW
for(int i=l;i<=r;i++){ k[f2`o=
temp=data; J _rrc;F
} Sr
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int i1=l; kL DpZ{
int i2=mid+1; d88A.Z3w
for(int cur=l;cur<=r;cur++){ oJA_"xp
if(i1==mid+1) }+@!c%TCx~
data[cur]=temp[i2++]; l8G1N[
else if(i2>r) +u|"q+p
data[cur]=temp[i1++]; >haihT
else if(temp[i1] data[cur]=temp[i1++]; 9J/[7TzSZ
else qSP&Fi
data[cur]=temp[i2++]; l`"?KD
} bTJ<8q
} I8XP`Ccq
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} ^BA
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改进后的归并排序: 3)WfBvG
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package org.rut.util.algorithm.support; PhyIea
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import org.rut.util.algorithm.SortUtil; ,8r?C !m]
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/** %,WH*")
* @author treeroot GL?b!4xx
* @since 2006-2-2 !7DDPJ~
* @version 1.0 CHGa_
*/ 7<su8*?
public class ImprovedMergeSort implements SortUtil.Sort { #G#gc`S-,
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private static final int THRESHOLD = 10; |$\K/]q-
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/* X,G<D}
* (non-Javadoc) NK qIx
* f-18nF7{
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Qyw@ r
*/ Y# }qXXZ>]
public void sort(int[] data) { i D 9 */
int[] temp=new int[data.length]; ]In7%Qb
mergeSort(data,temp,0,data.length-1); h^g0|p5
} M{ncWq*_j
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private void mergeSort(int[] data, int[] temp, int l, int r) { Z3&}C h
int i, j, k; X\`']\l
int mid = (l + r) / 2; L2>e@p\>
if (l == r) Lf((
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return; 1 !_p
if ((mid - l) >= THRESHOLD) 1r=cCM
mergeSort(data, temp, l, mid); hEHd$tH06
else <8}FsRr;J
insertSort(data, l, mid - l + 1); yx Om=V
if ((r - mid) > THRESHOLD) 0!,uo\`
mergeSort(data, temp, mid + 1, r); 36Lkcda[
else A'#d:lOA
insertSort(data, mid + 1, r - mid); E!ndXz 59
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for (i = l; i <= mid; i++) { OTF/Pu$
temp = data; l_}d Q&R
} |RL#BKC`
for (j = 1; j <= r - mid; j++) { `,6|6.8#
temp[r - j + 1] = data[j + mid]; 'Ou C[$Z
} .=;IdLO,Bf
int a = temp[l]; @dv8 F
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int b = temp[r]; ?JZ$M
for (i = l, j = r, k = l; k <= r; k++) { Tc(=J7*r&
if (a < b) { T3fQ #p
data[k] = temp[i++]; (ODwdN7;
a = temp; &IN%2c
} else { O2 >c|=#
data[k] = temp[j--]; 5TJd9:\Af
b = temp[j]; }`gOfj)?i
} ~5+RK16
} %rb$tKk
} 9nN1f@Y
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/** 8;?4rrS
* @param data e ymv/
* @param l &B&8$X
* @param i !hq2AY&H)
*/ Rq}lW.<r
private void insertSort(int[] data, int start, int len) { 94-BcN
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); +4-T_m/W/
} se x\dg<
} $~1vXe
} ketp9}u
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}