归并排序: iH#b"h{w
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package org.rut.util.algorithm.support; !Ui"<0[,
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import org.rut.util.algorithm.SortUtil; BL&D|e
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/** $^1L|KgXp
* @author treeroot 4\6-sL?rW
* @since 2006-2-2 sivd@7r\Fa
* @version 1.0 O^AF+c\n
*/ ~il{6Z+#n
public class MergeSort implements SortUtil.Sort{ \f AL:mJ
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/* (non-Javadoc) x`#|8
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) %%w/;o!c
*/ 3hrODts
public void sort(int[] data) { Rt{`v<
int[] temp=new int[data.length]; 22<T.c
mergeSort(data,temp,0,data.length-1); 3Q@HP;<
} p`i_s(u
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private void mergeSort(int[] data,int[] temp,int l,int r){ vGT#BS%
int mid=(l+r)/2; !w[io;
if(l==r) return ; D =Pv:)*]
mergeSort(data,temp,l,mid); u*<G20~A
mergeSort(data,temp,mid+1,r); E|aPkq]
for(int i=l;i<=r;i++){ N1LZ XXY{
temp=data; r9a?Y!(
} j3W)5ZX
int i1=l; Pkm3&sW
int i2=mid+1; AV0C9a/td
for(int cur=l;cur<=r;cur++){ \(C_t1
if(i1==mid+1) $1CAfSgKw
data[cur]=temp[i2++]; G(puC4 "&
else if(i2>r) =HF||p@
data[cur]=temp[i1++]; {iv!A=jld
else if(temp[i1] data[cur]=temp[i1++]; r#K;@wu2
else J)w58/`?t
data[cur]=temp[i2++]; l9J ]<gG
} nj7wc9z4
} z'G~b[kG4n
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} {ER%r'(4Z
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改进后的归并排序: tsFwFB*
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package org.rut.util.algorithm.support; 4I>I
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import org.rut.util.algorithm.SortUtil; >?$+hZz<
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/** y<G@7?
* @author treeroot M.Fu>Xi
* @since 2006-2-2 $?l?
* @version 1.0 ;)^eDJ<
*/ XeaO,P
public class ImprovedMergeSort implements SortUtil.Sort { tNskB`541
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private static final int THRESHOLD = 10; >qJRpO
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/* D3LW49
* (non-Javadoc) X5'QYZ6kv
* lg0iNc!
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) rurC! -
*/ "tgaFtC=w
public void sort(int[] data) { <t{T]i+
int[] temp=new int[data.length]; v'C`;I
mergeSort(data,temp,0,data.length-1); !O=J8;oLk
} Wmp,,H
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private void mergeSort(int[] data, int[] temp, int l, int r) { 5Pis0fa
int i, j, k; ]_S&8F}|
int mid = (l + r) / 2; Z6}B}5@y
if (l == r) $Nr :YI
return; ~;Ga65_6_
if ((mid - l) >= THRESHOLD) aDx{Q&
mergeSort(data, temp, l, mid); G[YbgG=9Y
else 7XE/bhe%S
insertSort(data, l, mid - l + 1); =kq!e
if ((r - mid) > THRESHOLD) m8Q6ESg<*u
mergeSort(data, temp, mid + 1, r); =Tf
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else Vwp fkD`
insertSort(data, mid + 1, r - mid); jUq^$+N
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for (i = l; i <= mid; i++) { g?ID}E~<
temp = data; )MFa~/x
} k`W.tMo
for (j = 1; j <= r - mid; j++) { +_gPZFpbx
temp[r - j + 1] = data[j + mid]; r'/7kF- 5
} hlxZq
int a = temp[l]; *yqEl
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int b = temp[r]; lm}mXFf#
for (i = l, j = r, k = l; k <= r; k++) { U:eahK
if (a < b) { #/ 1
data[k] = temp[i++]; d18%zY>
a = temp; {Slc6$
} else { zE +)oQ,
data[k] = temp[j--]; ~S)o('
b = temp[j]; B*A{@)_
} 3&kHAXzM
} y; Up@.IG
} QDS=M]
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/** B98&JoS
* @param data g]9!Pi8jn
* @param l d#.9!m~.
* @param i
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*/ ~xqRCf{8
private void insertSort(int[] data, int start, int len) { Mg]q^T.a
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); \$ L2xd
} w{3
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} ( Kh<qAP_n
} GMLq3_'
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}