归并排序: "5N$u(: b
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package org.rut.util.algorithm.support; 2t?>0)*m
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import org.rut.util.algorithm.SortUtil; D]'8BS3
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/** *N{k#d/
* @author treeroot u!It';j
* @since 2006-2-2 Sc}Rs
* @version 1.0 x|^p9m"=%
*/ `8\"3S
public class MergeSort implements SortUtil.Sort{ &h6 `hP_
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/* (non-Javadoc) ,*x/L?.Z!
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) LKZ<\%
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*/ %|R]nB
public void sort(int[] data) { 6y?uH;SL
int[] temp=new int[data.length]; r@'~cF]m
mergeSort(data,temp,0,data.length-1); KNP^k$=)3c
} q/@r#
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private void mergeSort(int[] data,int[] temp,int l,int r){ hQL@q7tUr
int mid=(l+r)/2; +zo\#8*0MF
if(l==r) return ; 4@ny%_/
mergeSort(data,temp,l,mid); J=O_nup6C
mergeSort(data,temp,mid+1,r); `tKs|GQf
for(int i=l;i<=r;i++){ ^foCcO
temp=data; $Grk{]nT
} I>-1kFma;
int i1=l; .ubZ
int i2=mid+1; pf yJL?_%
for(int cur=l;cur<=r;cur++){
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if(i1==mid+1) hHOx ]
data[cur]=temp[i2++]; JV!F<
else if(i2>r) EQHCw<e
data[cur]=temp[i1++]; &f)pU>Di
else if(temp[i1] data[cur]=temp[i1++]; ,^v_gc
else =XSupM[T
data[cur]=temp[i2++]; brqmi<*9"[
} 4~ nf~
} E(*CEW.V*
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} 3Dj>U*fP
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改进后的归并排序: cvtn,Ml6
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package org.rut.util.algorithm.support; ]yFO~4Nu
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import org.rut.util.algorithm.SortUtil; ^Vc(oa&;
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/** CX5>/
* @author treeroot A*]sN8
* @since 2006-2-2 BGu<1$G
* @version 1.0 pYUQSsqC
*/ @zt "Y~9i
public class ImprovedMergeSort implements SortUtil.Sort { | NFDrm
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private static final int THRESHOLD = 10; 1wggYX
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/* uCWBM
* (non-Javadoc) Je K0><
* 8ux
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) rZRTQ
*/ =%[vHQ\%
public void sort(int[] data) { ehMpo BL
int[] temp=new int[data.length]; 4/2@^\?i)
mergeSort(data,temp,0,data.length-1); h?->A#
} QbWeQ[V{
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private void mergeSort(int[] data, int[] temp, int l, int r) { i>pUTT
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int i, j, k; qUQP.4Z9 5
int mid = (l + r) / 2; '|&?$g(\h
if (l == r) og*ti!Z
return; >T\^dHtz
if ((mid - l) >= THRESHOLD) eFQz G+/
mergeSort(data, temp, l, mid); H]{`q
else )@.0ai
insertSort(data, l, mid - l + 1); QT(]S>--n
if ((r - mid) > THRESHOLD) !]z4'* )W
mergeSort(data, temp, mid + 1, r); Fj&8wZ)v)
else .&KC2#4
insertSort(data, mid + 1, r - mid); uUv^]B 8GM
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for (i = l; i <= mid; i++) { 'f7s*VKG
temp = data; Ui"3'OU'
} M^/ZpKeT"
for (j = 1; j <= r - mid; j++) { 5^2P\y(?
temp[r - j + 1] = data[j + mid]; A_.}-dzF
} e~6>8YO+7j
int a = temp[l]; kNrd=s,-]D
int b = temp[r]; J
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for (i = l, j = r, k = l; k <= r; k++) { T&E'MB
if (a < b) { Z?."cuTt
data[k] = temp[i++]; +OOmy
a = temp; v dU)
} else { vC^n_
data[k] = temp[j--]; (~#-J7
b = temp[j]; aSfAu!j)
} ]L\]Ll;
} #BI Z|
} ^8g<>,$
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/** H5A7EZq}`
* @param data q9$K.=_5
* @param l ,e*WJh8k[
* @param i AIM<mU
*/ ^`9O$.'@
private void insertSort(int[] data, int start, int len) { . H8 6f !=
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); <x:^w'V_b
} H+N6VVnO
} )=#zMdK&
} Gnie|[3
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}