归并排序: |w(@a:2kw
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package org.rut.util.algorithm.support; 'F'v/G~F
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import org.rut.util.algorithm.SortUtil; anj*a<C<
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/** &H!#jh\w
* @author treeroot tlU&p'
* @since 2006-2-2 gi;#?gps
* @version 1.0 Te`Z
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*/ ;!(.hCHvr
public class MergeSort implements SortUtil.Sort{ ;J3az`
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/* (non-Javadoc) x\vb@!BZ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) LPgP;%ohO/
*/ Lh~Ym<CeN
public void sort(int[] data) { ~
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int[] temp=new int[data.length]; xF*C0B;QL
mergeSort(data,temp,0,data.length-1); $=8?@My<
} ?`Oh]2n)6
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private void mergeSort(int[] data,int[] temp,int l,int r){ *
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int mid=(l+r)/2; CVsc#=w0
if(l==r) return ; @P:
mergeSort(data,temp,l,mid); f
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mergeSort(data,temp,mid+1,r); cGw* edgp6
for(int i=l;i<=r;i++){ v%|()Z0
temp=data; 2nOoG/6
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} K
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int i1=l; 0:^L>MO
int i2=mid+1; > m GO08X
for(int cur=l;cur<=r;cur++){ xN\PQ,J
if(i1==mid+1) iw|6w,-)C
data[cur]=temp[i2++]; pQaP9Y{OK
else if(i2>r) i)V-q9\
data[cur]=temp[i1++]; PgZ~of&
else if(temp[i1] data[cur]=temp[i1++]; U!sv6=(y@
else 1]r+$L3
data[cur]=temp[i2++]; irNGURLm
} s}Q%]W
} Za{sT&(|
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} ;b:Ct <
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改进后的归并排序: tk5Bb`a
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package org.rut.util.algorithm.support; FAAqdK0
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import org.rut.util.algorithm.SortUtil; =R)9_D6I
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/** .$>?2|gRv
* @author treeroot c?L_n=B
* @since 2006-2-2 i]Or'L0c
* @version 1.0 ': Gk~
*/ ap k06"/
public class ImprovedMergeSort implements SortUtil.Sort { mqGp]'{
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private static final int THRESHOLD = 10; .IYE+XzV
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/* <Tr_,Ya{9
* (non-Javadoc) 7~[1%`
* 4
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) zzfwI@4
*/ f<A Bs4w
public void sort(int[] data) { STp}?Cb
int[] temp=new int[data.length]; '\dau>
mergeSort(data,temp,0,data.length-1); V)\|I8"
} \HFh?3-g
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private void mergeSort(int[] data, int[] temp, int l, int r) { E)%]?/w
int i, j, k; GeN8_i[
int mid = (l + r) / 2; 8cy#[{u`;
if (l == r) 95giqQ(N
return; F9]j{'#
if ((mid - l) >= THRESHOLD) Y7)YJI
mergeSort(data, temp, l, mid); @W|}|V5
else HUurDgRi]
insertSort(data, l, mid - l + 1); ;pdW7
if ((r - mid) > THRESHOLD) +<Ot@ luE
mergeSort(data, temp, mid + 1, r); $~4ZuV%
else [Dp 6q~RM
insertSort(data, mid + 1, r - mid); ^I9x@t
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for (i = l; i <= mid; i++) { Zk2-U"0\o
temp = data; u2'xM0nQ
} Kx 6_Vp
for (j = 1; j <= r - mid; j++) { |{HtY
temp[r - j + 1] = data[j + mid]; ;<%~g8:XL
} ,WbO8#z+
int a = temp[l]; elXY*nt8h
int b = temp[r]; 0mL#8\'"
for (i = l, j = r, k = l; k <= r; k++) { E]6C1C&K
if (a < b) { !G3O!]
data[k] = temp[i++]; 72} MspzUt
a = temp; Ps0'WRJnx
} else { >:5/V0;,
data[k] = temp[j--]; 3/o-\wWO
b = temp[j]; ZbCu -a{v
} DGdSu6s$
} ~q#UH'=%
} zLuej'
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/** ihKnZcI$i
* @param data y1^<!I
* @param l NvXds;EC
* @param i VN|P(S6
*/ "y/GK1C
private void insertSort(int[] data, int start, int len) { YVZm^@ZVV
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); {$ 4fRxj
} 6w<jg/5t
} NMmk,
} _QfA'32S
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}