归并排序: `! _mIh}
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package org.rut.util.algorithm.support; ,8+Jt@L
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import org.rut.util.algorithm.SortUtil; [t"#4[
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/** oD_#oX5\
* @author treeroot 4_w{~
* @since 2006-2-2 2YpJ4.
* @version 1.0 FmhN*ZXr#
*/ _SqUPTb"u
public class MergeSort implements SortUtil.Sort{ !L@^Zgs|@?
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/* (non-Javadoc) m-R`(
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ;c|G
*/ '/@i}
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public void sort(int[] data) { \"l/D?+Q
int[] temp=new int[data.length]; ^A$p)`KR
mergeSort(data,temp,0,data.length-1); wu19Pg?F
} J(k C
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private void mergeSort(int[] data,int[] temp,int l,int r){ m ?jF:]^
int mid=(l+r)/2; g/OL^A
if(l==r) return ; T@j@IEGH
mergeSort(data,temp,l,mid); MJG)fFl]O
mergeSort(data,temp,mid+1,r); S/Gy:GIf
for(int i=l;i<=r;i++){ mH7Mch|
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temp=data; -4t!k
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} v:u=.by99
int i1=l; 2IFEl-IB[
int i2=mid+1; *"sDsXo- I
for(int cur=l;cur<=r;cur++){ G$CI~0Se:
if(i1==mid+1) 5db9C}0
data[cur]=temp[i2++]; c8M'/{4rH
else if(i2>r) crRYgr
data[cur]=temp[i1++]; Q#sLIZ8=
else if(temp[i1] data[cur]=temp[i1++]; ,Cj` 0v#
else 'L ]k\GO
data[cur]=temp[i2++]; <jtu/U]78|
}
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} THz=_L6
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} NEcE-7aT
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改进后的归并排序: gshgl3
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package org.rut.util.algorithm.support; U$AV"F&!&}
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import org.rut.util.algorithm.SortUtil; HbQ+:B]
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/** ys Td'J
* @author treeroot jt4c*0z
* @since 2006-2-2 Xjnv8{X
* @version 1.0 !&@!:=X,
*/ ljw>[wNv
public class ImprovedMergeSort implements SortUtil.Sort { nZ~J&QK-
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private static final int THRESHOLD = 10; ,-_\Y hY>
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/* 2j*o[kAE
* (non-Javadoc) !;COFR
* z.]
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Zh3hCxXa
*/ }pL#C
public void sort(int[] data) { a^.5cJ$]
int[] temp=new int[data.length]; f)%8*B
mergeSort(data,temp,0,data.length-1); _Sn7z?
} br_D
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private void mergeSort(int[] data, int[] temp, int l, int r) { yfCdK-9+B
int i, j, k; %Astfn(U{4
int mid = (l + r) / 2; [+z*&~'
if (l == r) 6qkMB|@Ix
return; $(ei<cAV
if ((mid - l) >= THRESHOLD) R,KoymXP
mergeSort(data, temp, l, mid); LGF5yRk
else #ybtjsu'"U
insertSort(data, l, mid - l + 1); I.RmBUq):s
if ((r - mid) > THRESHOLD) WR@TH
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mergeSort(data, temp, mid + 1, r); w}
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else ieG%D
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insertSort(data, mid + 1, r - mid); pZO`18z
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for (i = l; i <= mid; i++) { $ru()/pI)z
temp = data; fKjUEMRK
} oJbMUEQQq
for (j = 1; j <= r - mid; j++) { ]Z#=w
temp[r - j + 1] = data[j + mid]; MNZD-[
} ~x 0x.-^A
int a = temp[l]; x,>r}I>^Q
int b = temp[r]; cuW&X9\m,
for (i = l, j = r, k = l; k <= r; k++) { sQ>L3F;A`
if (a < b) { sqP (1|9
data[k] = temp[i++]; @?\[M9yK
a = temp; lgaE2`0 [3
} else { Mo_(WSs
data[k] = temp[j--]; 2fv`O
b = temp[j]; S1oP_A[|
} K`#bLCXEV0
} ibIo1i//[
} y0f"UH/
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/** T`gR&n<D
* @param data v6q oH)n
* @param l m C&*K
* @param i R@Kzdeo
*/ vS_Ji<W~E
private void insertSort(int[] data, int start, int len) { Y6r<+#V
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); |H7f@b]Sk
} 7lYiu fg
} ^CWxYDG*
} 0281"aO
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}