归并排序: %1a\"F![
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package org.rut.util.algorithm.support; (4n 8[
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import org.rut.util.algorithm.SortUtil; $d?<(n
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/** #
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* @author treeroot ( du<0J|PT
* @since 2006-2-2 D_`MeqF}C
* @version 1.0 tlu-zUsi
*/ >f4H<V-
public class MergeSort implements SortUtil.Sort{ )Ve?1?s '8
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/* (non-Javadoc) zCj]mH`es'
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) %7pT\8E5
*/ >Rs:Fw|jro
public void sort(int[] data) { Z ) qc-~S
int[] temp=new int[data.length]; h djv/
mergeSort(data,temp,0,data.length-1); bTE%p0
} "'-f?kZ
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private void mergeSort(int[] data,int[] temp,int l,int r){ LHKawEZ
int mid=(l+r)/2; wgpu]ooUF&
if(l==r) return ; QM`A74j0]\
mergeSort(data,temp,l,mid); Ki{&,:@
mergeSort(data,temp,mid+1,r); Uaog_@2n,
for(int i=l;i<=r;i++){ 5Y)*-JY1g
temp=data; 6;9SU+/
} Xa\{WM==;
int i1=l; 7qq}wR]]
int i2=mid+1; |Spy |,/
for(int cur=l;cur<=r;cur++){ DY'D]*'7$
if(i1==mid+1) ,ClGa2O
data[cur]=temp[i2++]; >7B6iR6N
else if(i2>r) su>GeJiPW
data[cur]=temp[i1++]; 5Q,#Co
else if(temp[i1] data[cur]=temp[i1++]; DG}t!
else I0.{OJ-
data[cur]=temp[i2++]; _CDUUr
} ]6Kx0mW
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改进后的归并排序: W'eF
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package org.rut.util.algorithm.support; qk{2%,u$@{
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import org.rut.util.algorithm.SortUtil; sL75C|f9
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/** <5rp$AzT
* @author treeroot 6MvjNbQ
* @since 2006-2-2 7RM$%'n\
* @version 1.0 h7f&7v
*/ b=horvs/!
public class ImprovedMergeSort implements SortUtil.Sort { d4t%/ Uh
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private static final int THRESHOLD = 10; }p$>V,u
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/* xDG8C39qrs
* (non-Javadoc) gUwg\>UC
* b/HhGA0
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) D/^yAfI
*/ ZH;VEX
public void sort(int[] data) { W2P(!q>r]
int[] temp=new int[data.length]; cm@q{(r
mergeSort(data,temp,0,data.length-1);
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} ET;YAa*
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private void mergeSort(int[] data, int[] temp, int l, int r) { <0g.<n,
int i, j, k; k#NIY4%.
int mid = (l + r) / 2; @{3$H^
if (l == r) !f[LFQD
return; FJomUVR .
if ((mid - l) >= THRESHOLD) rg64f'+Eug
mergeSort(data, temp, l, mid); X*hY?'Rp
else YAQ]2<H
insertSort(data, l, mid - l + 1); Fy37I/#)r&
if ((r - mid) > THRESHOLD) c1B<