归并排序: SufM~9Ll
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package org.rut.util.algorithm.support; >HwVP.~HN
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import org.rut.util.algorithm.SortUtil; GYf{~J
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/** PK&&Vu2M
* @author treeroot NzhWGr_x'
* @since 2006-2-2 2'W#x
* @version 1.0 q%A>q;l:
*/ $1s>efP-
public class MergeSort implements SortUtil.Sort{ HXdo:#xEO
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/* (non-Javadoc) <Mo{o2F=
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 8VG~n?y
*/ ~LFM,@
public void sort(int[] data) { +[i r7?Y.
int[] temp=new int[data.length]; 5HbJE'
mergeSort(data,temp,0,data.length-1); +B+cN[d
} zJ1M$U
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private void mergeSort(int[] data,int[] temp,int l,int r){ D2o|.e<r
int mid=(l+r)/2; XD!}uDZ^
if(l==r) return ; ]-X\n
mergeSort(data,temp,l,mid); 5\JV }
mergeSort(data,temp,mid+1,r); %O[1yZh
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for(int i=l;i<=r;i++){ FoYs<aER
temp=data; ;&?ITV
} <H<Aba9\
int i1=l; WyQ8}]1b
int i2=mid+1; ,_7m<(/f
for(int cur=l;cur<=r;cur++){ &DtI+)[|
if(i1==mid+1) 6y`FW[
data[cur]=temp[i2++]; :TnU} i_/h
else if(i2>r) zC[LcC*+J
data[cur]=temp[i1++]; @#o7U
else if(temp[i1] data[cur]=temp[i1++]; n@C#,v#^0
else L4u.cHJ}0
data[cur]=temp[i2++]; -s0J8b
} /
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} @LU[po1I
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改进后的归并排序: R*ex!u60M
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package org.rut.util.algorithm.support; =q"0GUei3
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import org.rut.util.algorithm.SortUtil; /@&uaw
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/** v )2yR~J
* @author treeroot 0}kvuuR
* @since 2006-2-2 3_eg'EP.E
* @version 1.0 f
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*/ = K`]cEL
public class ImprovedMergeSort implements SortUtil.Sort { K6~')9Q
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private static final int THRESHOLD = 10; R
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/* QqeF
* (non-Javadoc) @k:@mzB7R
* EW)r/Av:,
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) kAxJ#RG
*/ 4l/~::y
public void sort(int[] data) { .Z 17X_
int[] temp=new int[data.length]; 4h}\Kl
mergeSort(data,temp,0,data.length-1); 5':j=KQE_
} h=NXU9n%'
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private void mergeSort(int[] data, int[] temp, int l, int r) { VF7H0XR/k5
int i, j, k; wmP[\^c%$j
int mid = (l + r) / 2; `"iPJw14
if (l == r) aH500
return; LzB*d
if ((mid - l) >= THRESHOLD) ]@}@G[e#[
mergeSort(data, temp, l, mid); 7d_"4;K)
else %a-fxV[
insertSort(data, l, mid - l + 1); TQ {8 ee{
if ((r - mid) > THRESHOLD) f,@~@f
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mergeSort(data, temp, mid + 1, r); HE2t0sAYX
else /cZcfCW
insertSort(data, mid + 1, r - mid); AZJ|.mV q
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for (i = l; i <= mid; i++) { ,zBc-Cm
temp = data; 9*?YES'6
} c8cGIAOY)
for (j = 1; j <= r - mid; j++) { UyNP:q:
temp[r - j + 1] = data[j + mid]; (i@(ZG]/
} t$Ua&w
int a = temp[l]; Hu!<GB~
int b = temp[r]; B=%YD"FAv
for (i = l, j = r, k = l; k <= r; k++) { N,cj[6;T%
if (a < b) { Tl^)O^/
data[k] = temp[i++]; 4)N~*+~\h
a = temp; <S@2%%W
} else { pl 1CEoe
data[k] = temp[j--]; +k
b = temp[j]; V F"c}
} #Pq6q.UB
} t 9.iWIr
} 2l8z/o 7v
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/** W5RZsS]
* @param data -dUXd<=ue
* @param l }-WuHh#
* @param i wmX * n'l
*/ \FyHIs
private void insertSort(int[] data, int start, int len) { 3\P/4GK)
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); ~^eC?F(
} ".fnx8v,
} C2
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} LFQPysC
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}