归并排序: x'|ty[87
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package org.rut.util.algorithm.support; (5T>`7g8
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import org.rut.util.algorithm.SortUtil; m6Dm1'+
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/** r)<A YX]J
* @author treeroot OUv )`K
* @since 2006-2-2 P\"kr?jZP
* @version 1.0 T?3Q<[SmI
*/ J= A)]YE
public class MergeSort implements SortUtil.Sort{ [S6u:;7
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/* (non-Javadoc) }?[];FB
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) gM96RY
*/ NaR} 0
public void sort(int[] data) { t{})6
int[] temp=new int[data.length];
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mergeSort(data,temp,0,data.length-1); VDxm|7
} k1Y\g'1
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private void mergeSort(int[] data,int[] temp,int l,int r){ [RF,0>^b
int mid=(l+r)/2; K^WDA])
if(l==r) return ; %.bDK}
mergeSort(data,temp,l,mid); 1_Yx]%g<
mergeSort(data,temp,mid+1,r); C4m+Ta%
for(int i=l;i<=r;i++){ r8:r}Qj2w[
temp=data; /?.?1-HM
} p6JTNxD
int i1=l; g->*@%?<w>
int i2=mid+1; Nl\`xl6y]
for(int cur=l;cur<=r;cur++){ =,XCjiBeC
if(i1==mid+1) @pH2"k|
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data[cur]=temp[i2++]; #`Su3~T=S
else if(i2>r) eWH0zswG
data[cur]=temp[i1++]; ~WA@YjQ]
else if(temp[i1] data[cur]=temp[i1++]; tZ]gVgZg
else rPk|2l,E,3
data[cur]=temp[i2++]; }Rh\JDiQ
} z5@XFaQ
} D]~K-[V?l
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} &8IBf8
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改进后的归并排序: QE]'Dc%
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package org.rut.util.algorithm.support; ')xOL=w
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import org.rut.util.algorithm.SortUtil; I%d=c0>%
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/** >LBA0ynh
{
* @author treeroot e-dkvPr
* @since 2006-2-2 a_N7X
* @version 1.0 Us`=^\
*/
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public class ImprovedMergeSort implements SortUtil.Sort { u^MKqI
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private static final int THRESHOLD = 10; qT#e
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/* 5]O{tSj
* (non-Javadoc) gWj-@o\
* O:?3B!wF
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ;yNc7Vl
*/ 7xnj\9$m
public void sort(int[] data) { ZTR9e\F
int[] temp=new int[data.length]; _=g&^_ #t
mergeSort(data,temp,0,data.length-1); 9evr!=":
} ZthT('"a
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private void mergeSort(int[] data, int[] temp, int l, int r) { ~b_DFj
int i, j, k; UytMnJ88
int mid = (l + r) / 2; :FAPH8]
if (l == r) ,z&S;f.f
return; <rzP
if ((mid - l) >= THRESHOLD) dN2JOyS
mergeSort(data, temp, l, mid); }nrjA0WN
else +&.zwniSS
insertSort(data, l, mid - l + 1); 15ailA&(Qm
if ((r - mid) > THRESHOLD) fRS;6Jc
mergeSort(data, temp, mid + 1, r); Cm[}DB
else e:O,$R#g
insertSort(data, mid + 1, r - mid); e)sR$]i:v
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for (i = l; i <= mid; i++) { Xs2}n^#i
temp = data; oSCaP,P
} Sa g)}6+
for (j = 1; j <= r - mid; j++) { v3r3$(Hr
temp[r - j + 1] = data[j + mid]; ?V6,>e_+
} #E]K*mE'
int a = temp[l]; zQ,rw[C"W
int b = temp[r]; R4p Pt
for (i = l, j = r, k = l; k <= r; k++) { ]-gyXE1.r
if (a < b) { z0[@O)Sj
data[k] = temp[i++]; ggDT5hb
a = temp; 4aO/^Hl
} else { =:rg1wo"c
data[k] = temp[j--]; $tZ
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b = temp[j]; 5`^@k<
} f|{iW E2d
} 868X/lL
} 8'PZA,CW
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/** 3U<m\A1
* @param data ceUe*}\cr
* @param l "B QnP9
* @param i nCY kUDnZ
*/ Ty g>Xv
private void insertSort(int[] data, int start, int len) { Znb={hh
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 6H |1IrG
} >jt2vU@t.
} SwOW%o
} x;~:p;]J2F
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}