归并排序: bY#;E;'7
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package org.rut.util.algorithm.support; LXhaD[1Rb
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import org.rut.util.algorithm.SortUtil; hWGZd~L
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/** IUhp;iH
* @author treeroot z g]Drm
* @since 2006-2-2 Uu2N9.5
* @version 1.0 lL2-.!]R
*/ !Q[}s#g
public class MergeSort implements SortUtil.Sort{ q]v,
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/* (non-Javadoc) G:Hj;&'2
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) =jIxI,
*/ :QA@ c|(PF
public void sort(int[] data) { ZDlu1>Q
int[] temp=new int[data.length]; T0L+z/N_m.
mergeSort(data,temp,0,data.length-1); <;KRj85"j
} OLFt;h
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private void mergeSort(int[] data,int[] temp,int l,int r){ QV)}3pW
int mid=(l+r)/2; X\G)81Q.S
if(l==r) return ; 3L fTGO
mergeSort(data,temp,l,mid); pYGYy'%A'
mergeSort(data,temp,mid+1,r); XWF7#xM
for(int i=l;i<=r;i++){ {F)E\)$G
temp=data; }wkaQQh
} E8;TLk4\
int i1=l; W%zmD Hk~
int i2=mid+1; v|y<_Ya
for(int cur=l;cur<=r;cur++){ ):}Fu
if(i1==mid+1) ,#
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data[cur]=temp[i2++]; R8{e&nPE
else if(i2>r) 7BrV<)ih{*
data[cur]=temp[i1++]; ^(m0M$Wk*
else if(temp[i1] data[cur]=temp[i1++]; )ys=+Pz
else T"A^[r*
data[cur]=temp[i2++]; <!hpfTz*
} Ix4 jof6(
} 7n<#y;wo
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} 7n
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改进后的归并排序: |Pj9ZG#
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package org.rut.util.algorithm.support; mj,qQ=n;p
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import org.rut.util.algorithm.SortUtil; AAdD\%JZ
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/** t0I>5#*WU
* @author treeroot Wu]/(F
* @since 2006-2-2 +0dQORo
* @version 1.0 s?~8O|Mu'
*/ oFwG+W/
public class ImprovedMergeSort implements SortUtil.Sort { QQSH +
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private static final int THRESHOLD = 10; KWtu,~O_u
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/* D8q3TyCj%
* (non-Javadoc) [}jj<!9A_;
* \}U[}5Pk&
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) e!.7no
*/ |K'Gw}fX/
public void sort(int[] data) { l@~1CMyN
int[] temp=new int[data.length]; 8x!+tw7
mergeSort(data,temp,0,data.length-1); %_]=i@Y~
} NW}>pb9
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private void mergeSort(int[] data, int[] temp, int l, int r) { AB/,S
int i, j, k; Xs{:[vRW
int mid = (l + r) / 2; DxE^#=7iH;
if (l == r) N)9pz?*V
return; 9k714bnMLX
if ((mid - l) >= THRESHOLD) YJ&lB&xH
mergeSort(data, temp, l, mid); 8=lHUn9l
else ._8xY$l$
insertSort(data, l, mid - l + 1); i5ajM,i/K
if ((r - mid) > THRESHOLD) Usa{J:
mergeSort(data, temp, mid + 1, r); D{Hh#x8Y
else \f8P`oET~
insertSort(data, mid + 1, r - mid); >cGh| _9
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for (i = l; i <= mid; i++) { ^4y(pcD
temp = data; D[?k ,*
} %RCl+hOP.h
for (j = 1; j <= r - mid; j++) { /}h71V!
temp[r - j + 1] = data[j + mid]; < fojX\}3
} NB|RZf9M
int a = temp[l]; p?J~'
int b = temp[r]; V6DBKq
for (i = l, j = r, k = l; k <= r; k++) { m;;0 Cl
if (a < b) { Ov0O#`
data[k] = temp[i++]; Pg!;o=
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a = temp; ]7XkijNb
} else { &=+cov(3
data[k] = temp[j--]; rW=k%#
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b = temp[j]; ~8KF<2c
} rX|y/0)F
} h"RP>fZt
} v!pj v%
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/** d- Z+fz
* @param data *zw
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* @param l uQ)JC7b\
* @param i [*Aqy76Qa
*/ jkQt'!
private void insertSort(int[] data, int start, int len) { =sUl`L+w,L
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); #Lhj0M;a
} xN{"%>Mx
} +q`rz
} RpmBP[
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}