归并排序: ,`U>BBBLv
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package org.rut.util.algorithm.support; a<*+rGI
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import org.rut.util.algorithm.SortUtil; 5NkF_&S_1
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/** q AVypP?J
* @author treeroot 8K^#$,.."
* @since 2006-2-2 xlcCL?qQj
* @version 1.0 -qpvVLR,
*/ H M(X8iNt
public class MergeSort implements SortUtil.Sort{ N[9o6Nl|a
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/* (non-Javadoc) ^WU[+H ;
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) R;,5LS&*a
*/ 5X8 i=M;
public void sort(int[] data) { ?taC
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int[] temp=new int[data.length]; uv5NqL&
mergeSort(data,temp,0,data.length-1); /@Jg [na
} ^G qO>1U
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private void mergeSort(int[] data,int[] temp,int l,int r){ ?Kmz urG
int mid=(l+r)/2; `?T::&`
if(l==r) return ; YS4"TOFw
mergeSort(data,temp,l,mid); Q?hf2iw
mergeSort(data,temp,mid+1,r); %#fjtbeB
for(int i=l;i<=r;i++){ aQH]hLvs
temp=data; A|Ft:_Y
} ZYY`f/qi
int i1=l; qAp<OJ
int i2=mid+1; };rEN`L
for(int cur=l;cur<=r;cur++){ Sc3{Y+g
if(i1==mid+1) 8\nka5
data[cur]=temp[i2++]; :bo2H[U+
else if(i2>r) "z6p=B"?3
data[cur]=temp[i1++]; D=LsoASVI
else if(temp[i1] data[cur]=temp[i1++]; Ww~C[8q
else nYC.zc*o x
data[cur]=temp[i2++]; bfUKh%!M
} j*?E~M.'1K
} ?gu!P:lZS
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} Tb^1#O
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改进后的归并排序: >q')%j
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package org.rut.util.algorithm.support; X'.lh#&
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import org.rut.util.algorithm.SortUtil; 3f>9tUWhTy
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/** zn'Mi:O'p
* @author treeroot c.Izm+9k
* @since 2006-2-2 {OQ)Np!
* @version 1.0 uR=*q a
*/ AN,3[Sh
public class ImprovedMergeSort implements SortUtil.Sort { s!W{ru
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private static final int THRESHOLD = 10; o7gZc/?n
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/* , iEGf-!k
* (non-Javadoc) 8~!h8bkC
* f&F9ImZ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) >y}> 5kv
*/ 7u1o>a%9
public void sort(int[] data) { hQ)?LPUB
int[] temp=new int[data.length]; g}?39?o4
mergeSort(data,temp,0,data.length-1); 8eCh5*_$
} amQiH!}8R
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private void mergeSort(int[] data, int[] temp, int l, int r) { ,LOx!
int i, j, k; >7?Lq<H
int mid = (l + r) / 2; Us6~7L00
if (l == r) gjJ:s,Fg
return; W;X:U.
if ((mid - l) >= THRESHOLD) i'ZnU55=
mergeSort(data, temp, l, mid); u9 *ic~Nh
else G=Xas"|
insertSort(data, l, mid - l + 1); 5a5JOl$8
if ((r - mid) > THRESHOLD) 4X:mb}(
mergeSort(data, temp, mid + 1, r); <e|B7<.
else o`~,+6]D
insertSort(data, mid + 1, r - mid); 7 }t=Lx(
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for (i = l; i <= mid; i++) {
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temp = data; SbtZhg=S_
} %Zeb#//Jz
for (j = 1; j <= r - mid; j++) { F(U(b_DPM
temp[r - j + 1] = data[j + mid]; 8M4GforP
} dphWxB
int a = temp[l]; g|]Hm*
int b = temp[r]; f'j<v
for (i = l, j = r, k = l; k <= r; k++) { ?Rh[S
if (a < b) { `y"a>gHC
data[k] = temp[i++]; 3D,tnn+J
a = temp; t,~feW,
} else { Ch=jt*0
data[k] = temp[j--]; YyY?<<z%
b = temp[j]; \ 6Y%z
} U,<?]h
} DI :
} `'rvDaP
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/** 8P%Jky&(
* @param data EBmkKiI;
* @param l %u?A>$Jn
* @param i P?=}}DI
*/ |l~#qeZ%
private void insertSort(int[] data, int start, int len) { =EHKu|rX~
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); P!R`b9_U
} H/0b3I^
} V4*/t#L/
} q) e*eN
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}