归并排序: E/AM<eN
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package org.rut.util.algorithm.support; zXZy:SD
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import org.rut.util.algorithm.SortUtil; ("mW=Ln
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/** t1IC0'o-
* @author treeroot HHtp.;L/
* @since 2006-2-2 JEFW}M)UGv
* @version 1.0 0#<_:E
*/ EL~s90C
public class MergeSort implements SortUtil.Sort{ ;
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/* (non-Javadoc)
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) zCPjuS/~
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*/ 1NJ*EzJ~?
public void sort(int[] data) { Ya\G/R
int[] temp=new int[data.length]; _%<7!|"
mergeSort(data,temp,0,data.length-1); b*.)m
} #v~zf@<KLB
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private void mergeSort(int[] data,int[] temp,int l,int r){ d5sGt#
int mid=(l+r)/2; BWw7o{d
if(l==r) return ; |%zhwDQ.
mergeSort(data,temp,l,mid); lWnV{/q\X
mergeSort(data,temp,mid+1,r); TSE(Kt
for(int i=l;i<=r;i++){ C8NbxP
temp=data; yHT}rRS8
} tk_y~-xz
int i1=l; o&I0*~sN
int i2=mid+1; y]cx}9~
for(int cur=l;cur<=r;cur++){ VVCCPK^<
if(i1==mid+1) zIRa%%.i<
data[cur]=temp[i2++]; gU+BRTZ&x
else if(i2>r) (Grj_p6O
data[cur]=temp[i1++]; V@cRJ3ZF
else if(temp[i1] data[cur]=temp[i1++]; mb\vHu*53
else *Q51'?y
data[cur]=temp[i2++]; MV=.(Zs
} +wT,dUin_<
} 7 yF#G 9,
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} /R@(yT=t
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改进后的归并排序: li
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package org.rut.util.algorithm.support; ^{Syg;F=
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import org.rut.util.algorithm.SortUtil; (
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/** 7"8HlOHA
* @author treeroot jzzVZ%t
* @since 2006-2-2 7B7I'{d
* @version 1.0 Gg,,qJO
*/ t}*teo[
public class ImprovedMergeSort implements SortUtil.Sort { 3PBg3Y$
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private static final int THRESHOLD = 10; R<JI
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/* >@]E1Qfe
* (non-Javadoc) ;'p0"\SV
* 73N%_8DH
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) a.w,@!7
*/ #gsAwna3
public void sort(int[] data) { PB }$.8
int[] temp=new int[data.length]; -Ca.:zX
mergeSort(data,temp,0,data.length-1); ;5y!,OF6
} 5]'iSrp
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private void mergeSort(int[] data, int[] temp, int l, int r) { !kmo%+
int i, j, k; (v(_XlMK
int mid = (l + r) / 2; `bt]v $
if (l == r) X*FK6,Y|(
return; : PQA9U|
if ((mid - l) >= THRESHOLD) O7rm(
mergeSort(data, temp, l, mid); q{KRM\ooYs
else _L# Tp
insertSort(data, l, mid - l + 1); Blaj07K
if ((r - mid) > THRESHOLD) r>osa3N'
mergeSort(data, temp, mid + 1, r); S"N@.n[
else LU;ma((yy[
insertSort(data, mid + 1, r - mid); c}rRNS$F
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for (i = l; i <= mid; i++) { mP:mzmUw
temp = data; 5HOhk"
} ;5 IS58L
for (j = 1; j <= r - mid; j++) { X>*zA?:
temp[r - j + 1] = data[j + mid]; G. <9K9K
} C'zMOR6c
int a = temp[l]; tx5@r;
int b = temp[r]; gs0,-)
for (i = l, j = r, k = l; k <= r; k++) { :%!SzI?
if (a < b) { @^;\(If2
data[k] = temp[i++]; uOougSBV,
a = temp; 45ct*w
} else { ^Jc~G~x4*
data[k] = temp[j--]; uP+
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b = temp[j]; e@F&/c
} Dw.>4bA.
} B5tJ|3!
} eeL%Yp3+
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/** pCpj#+|_)
* @param data aIqNNR
* @param l dIM:U:c
* @param i 7&HP2r
*/ HjV^6oP
private void insertSort(int[] data, int start, int len) { 1f}S:Z
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); jp[QA\
} tP3H7Yl!g
} ?(g kkYI
} 4&`66\p;
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}