归并排序: p"[O#*p
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package org.rut.util.algorithm.support; V \6(d
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import org.rut.util.algorithm.SortUtil; G`,u40a
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/** ok `]:gf
* @author treeroot T0`"kjE
* @since 2006-2-2 !8Z2X!$m{<
* @version 1.0 }3f
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*/ hhpv\1h#
public class MergeSort implements SortUtil.Sort{ G [3k
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/* (non-Javadoc) 8M^wuRn
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) L6:W'u^
*/ #M5_em4kN
public void sort(int[] data) { i s L{9^
int[] temp=new int[data.length]; {[2tG U9
mergeSort(data,temp,0,data.length-1); }pMP!%|
} "F-Y^
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private void mergeSort(int[] data,int[] temp,int l,int r){ c[VrC+e m
int mid=(l+r)/2; ?&znUoB
if(l==r) return ; ,Z>wbMJig
mergeSort(data,temp,l,mid); e=t<H"&
mergeSort(data,temp,mid+1,r); P_p6GT:5
for(int i=l;i<=r;i++){ Ys-Keyg
temp=data; >1x7UXs~:
} )Fqy%uR8
int i1=l; r8uqcKfU
int i2=mid+1; PSTu /^
for(int cur=l;cur<=r;cur++){ t`"^7YFS>
if(i1==mid+1) J3B6X 8P'
data[cur]=temp[i2++]; +
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else if(i2>r) Z-)[1+Hs
data[cur]=temp[i1++]; K8?zgRG3~N
else if(temp[i1] data[cur]=temp[i1++]; KNg8HYFW\
else 2Co@+I[,4&
data[cur]=temp[i2++]; j2|XDOf
} E:
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} 5kcJ
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} cYGRy,'gH
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改进后的归并排序: &*B>P>x
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package org.rut.util.algorithm.support; - $U@By<SJ
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import org.rut.util.algorithm.SortUtil; [2Iau1<@
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/** *B0V<mV
* @author treeroot 4s9c#nVlu
* @since 2006-2-2 z|ves&lRa
* @version 1.0 cDCJ]iDs
*/ f1A_`$>
public class ImprovedMergeSort implements SortUtil.Sort { _N98 vf0o
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private static final int THRESHOLD = 10; z@zD .
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/* ><[|
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* (non-Javadoc) /H')~!Yz
* 2Ok?@ZdjA{
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Bg-VCJI<
*/ #c-b}.R
public void sort(int[] data) { MDk*j,5V
int[] temp=new int[data.length];
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mergeSort(data,temp,0,data.length-1); JwZ?hc
} TfJL+a0
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private void mergeSort(int[] data, int[] temp, int l, int r) { EYG"49
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int i, j, k; ;4,'y
int mid = (l + r) / 2; tWm> j
if (l == r) huz86CO
return; T?>E{1pS
if ((mid - l) >= THRESHOLD) ! ,@ZQS
mergeSort(data, temp, l, mid); UxyY<H~Wx
else t\8&*(&3F
insertSort(data, l, mid - l + 1); C1d
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if ((r - mid) > THRESHOLD) NS@{~;#R
mergeSort(data, temp, mid + 1, r); sGSsUO:@j;
else ,'~#Ch
insertSort(data, mid + 1, r - mid); 8Jr1_a
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for (i = l; i <= mid; i++) { i^WIr h3a
temp = data; lzEb5mg
} >9=:sSQu
for (j = 1; j <= r - mid; j++) { Qm<
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temp[r - j + 1] = data[j + mid]; wxj>W[V
} > @+#
int a = temp[l]; &pM'$}T*
int b = temp[r]; P*YK9Hl<
for (i = l, j = r, k = l; k <= r; k++) { \m f*ge\
if (a < b) { <s_=-"
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data[k] = temp[i++]; ?4 qkDtm
a = temp; BEWro|]cM
} else { ZRnL_z~
data[k] = temp[j--]; atyu/+U'}
b = temp[j]; 1Y#HcW&
} SG:bM7*1'
} e2c1pgs&+
} {b1UX9y
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/** 9x?B5Ap[
* @param data }p=g*Zo*C;
* @param l ZHCr2^w6
* @param i Q[uAIyv0
*/ 77*qkKr
private void insertSort(int[] data, int start, int len) { If;R?j0;Q
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 4O(@'#LLz
} 7S<UFj
} X D) 8?
} zI^Da!r.
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}