归并排序: VfOm#Ue0q
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package org.rut.util.algorithm.support; =Jfo=`da
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import org.rut.util.algorithm.SortUtil; |Id0+-V
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/** y@"6Dt|
* @author treeroot (j;s6g0
* @since 2006-2-2 62~8>71;'
* @version 1.0 W'x/Kg,w-
*/ 7Z0fMk
public class MergeSort implements SortUtil.Sort{ mt$0p|B8
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/* (non-Javadoc) n>?o=_|uR
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) I!?-lI@(
*/ Y.&nxT95=
public void sort(int[] data) { aMQfg51W:
int[] temp=new int[data.length]; @l:\0cO
mergeSort(data,temp,0,data.length-1); uc]]zI6
} -ju&"L B
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private void mergeSort(int[] data,int[] temp,int l,int r){ ,h,DB=!K<
int mid=(l+r)/2; /1ZRjf^
if(l==r) return ; x5_V5A/@LU
mergeSort(data,temp,l,mid); #?8dInu>
mergeSort(data,temp,mid+1,r); 7 sv
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for(int i=l;i<=r;i++){ lB9 9J"A
temp=data; sJ[I<
} pEf1[ zq
int i1=l; vZ[wr@)
int i2=mid+1; 4Cs
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for(int cur=l;cur<=r;cur++){ aI]EwVz-q
if(i1==mid+1) lt\.
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data[cur]=temp[i2++]; F]kn4zr
else if(i2>r) ygoA/*s
data[cur]=temp[i1++]; Os--@5e
else if(temp[i1] data[cur]=temp[i1++]; tB4dkWt.}
else f& P'Kxj_
data[cur]=temp[i2++]; 0Z9>%\km_
} ^]}+s(
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改进后的归并排序: g{wOq{7V
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package org.rut.util.algorithm.support; &Z!O
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import org.rut.util.algorithm.SortUtil; Q!7il<S
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/** KwO;ICdJ
* @author treeroot PhTMXv<cE
* @since 2006-2-2 J?VMQTa/+
* @version 1.0 /U\k<\1~m
*/ Fq\vFt|m<
public class ImprovedMergeSort implements SortUtil.Sort { S"+X+Oxp7?
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private static final int THRESHOLD = 10; 2wR?ON=Q
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/* r ]JV!'R
* (non-Javadoc) V0 70oZ
* BN??3F8C
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[])
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*/ GH ]c
public void sort(int[] data) { [t#xX59
int[] temp=new int[data.length]; G`1!SEae
mergeSort(data,temp,0,data.length-1); 66ULR&D8
} PM]|S`
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private void mergeSort(int[] data, int[] temp, int l, int r) { RLl*@SEi"
int i, j, k;
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int mid = (l + r) / 2; 8SH&b8k<<
if (l == r) B?A]0S
return; )b AO A
if ((mid - l) >= THRESHOLD) H!N`hEEj>
mergeSort(data, temp, l, mid); m5i?<Ko@
else YU>NGC]}d
insertSort(data, l, mid - l + 1); KV&4Ep#
if ((r - mid) > THRESHOLD) 7dxTyn=
mergeSort(data, temp, mid + 1, r); PydU.,^7
else D@.+B`bA
insertSort(data, mid + 1, r - mid); ;W"=s79
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for (i = l; i <= mid; i++) { ))M!"*
temp = data; 8NP|>uaj
} i`k{}!F
for (j = 1; j <= r - mid; j++) { 3i\<#{
temp[r - j + 1] = data[j + mid]; mO#62e4C
} _#;UXAi
int a = temp[l]; M/<>'%sj
int b = temp[r]; Zw@=WW[Q`p
for (i = l, j = r, k = l; k <= r; k++) { 4v[Zhf4JM
if (a < b) { z[vHMJ
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data[k] = temp[i++]; +"P!es\q
a = temp; LR`]C]
} else { MKiP3kt8
data[k] = temp[j--]; qXF#qS-28
b = temp[j]; V.\12P
} /O`<?aP%
} Go;fQ yG
} GN0s`'#"3%
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/** <PMQ$s>KK
* @param data fX:=_c
* @param l Pi/V3D)B
* @param i >~+qU&'2
*/ $X\deJ1Hi
private void insertSort(int[] data, int start, int len) { pDYcsC{p
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); _|^cudRv
} I
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} .I
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} n^[VN[VC
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}