归并排序: [F>zM
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package org.rut.util.algorithm.support; g)"6|Z?D"
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import org.rut.util.algorithm.SortUtil; ES+&e/G"ds
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/** R52!pB0[
* @author treeroot SnXLjJe
* @since 2006-2-2 b/G0EcRw+
* @version 1.0 I4)vJ0
*/ G(4k#jB
public class MergeSort implements SortUtil.Sort{ SHaZ-d
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/* (non-Javadoc) EXzY4D ^
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) fHgfI@{=j
*/ X(1.Hjh
public void sort(int[] data) { Ylf 6-FbF
int[] temp=new int[data.length]; 6z(_^CY
mergeSort(data,temp,0,data.length-1); H1@"Yg8
} k{;:KW|
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private void mergeSort(int[] data,int[] temp,int l,int r){ kj[[78
int mid=(l+r)/2; E>[~"~x"pV
if(l==r) return ; 5|/vc*m_0'
mergeSort(data,temp,l,mid); J)(pGS@
mergeSort(data,temp,mid+1,r); EuAa
for(int i=l;i<=r;i++){ NfSe(rd
temp=data; [IYs4Y5
} /2z2a-!r
int i1=l; H#ihU3q
int i2=mid+1; CUtk4;^y#
for(int cur=l;cur<=r;cur++){ O=mJ8W@
if(i1==mid+1) QR#,n@fE
data[cur]=temp[i2++]; ^=@%@mR/[C
else if(i2>r) cEN^H
data[cur]=temp[i1++]; d
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else if(temp[i1] data[cur]=temp[i1++]; '3xSzsDn
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} iGp@P=;m
} )HmpVH
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改进后的归并排序: &oR&NKk
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package org.rut.util.algorithm.support; abF_i#
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import org.rut.util.algorithm.SortUtil; QOO BCNe
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/** oo qNPLa
* @author treeroot ~vt8|OOo0
* @since 2006-2-2 U@*z#T#"m
* @version 1.0 =EG[_i{r
*/ `Ffn:=Do
public class ImprovedMergeSort implements SortUtil.Sort { c2y5[L7?
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private static final int THRESHOLD = 10; e5AiIVlv
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/* T|=8jt,
* (non-Javadoc)
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* t4Z.b 5g
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) QM$?}>:
*/ a7CJ~8-1K
public void sort(int[] data) { +[>m`XTq
int[] temp=new int[data.length]; |5W u0T
mergeSort(data,temp,0,data.length-1); 5zUD W?
} R` N-^x
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private void mergeSort(int[] data, int[] temp, int l, int r) { >97V2W
int i, j, k; 7[K$os5al
int mid = (l + r) / 2; 2yN~[,L
if (l == r) YS/DIH{9e
return; J"z8olV
if ((mid - l) >= THRESHOLD) +Oxl1fDf
mergeSort(data, temp, l, mid); avT>0b:
else -PX {W)Aw
insertSort(data, l, mid - l + 1); :JOF!Q
if ((r - mid) > THRESHOLD) @1kA%LLK
mergeSort(data, temp, mid + 1, r); {>~|xW
else u=4tW:W,
insertSort(data, mid + 1, r - mid); BeVQ[
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for (i = l; i <= mid; i++) { ]v+\v re
temp = data; VJPt/Dy{
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for (j = 1; j <= r - mid; j++) { T+gqu
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temp[r - j + 1] = data[j + mid]; rSa3u*xB
} lT%o6qgT
int a = temp[l]; ~< k'{
int b = temp[r]; Va{`es)hky
for (i = l, j = r, k = l; k <= r; k++) { V43|Ej}E
if (a < b) { (l$bA_F\
data[k] = temp[i++]; z,^baU
a = temp; ,H|V\\
} else { P ^D\znvc
data[k] = temp[j--]; (llg!1
b = temp[j]; J0{0B=d;
} "eBpSV>nnQ
} "d{ |_Cf
} $cYh X^YG.
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/** X)'uTf0
* @param data C7nLa@
* @param l UD.$C
* @param i b&0q%tCK
*/ `~gyq>Ik2
private void insertSort(int[] data, int start, int len) { "zYlddh
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); Of-l<Ks\
} jy6%
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} ]r|X[9
} /9i2@#J}W1
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}