归并排序: M{G$Pk8[
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package org.rut.util.algorithm.support; Ty.drM
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import org.rut.util.algorithm.SortUtil; 1BTgGF
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/** H8(C>w-'
* @author treeroot I>\}}!
* @since 2006-2-2 UUD\bWfn
* @version 1.0 #.~.UHt
*/ vrQFx~ZztH
public class MergeSort implements SortUtil.Sort{ k -io$
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/* (non-Javadoc) {rs6"X^
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) y{:]sHyG
*/ #DrZ`Aq
public void sort(int[] data) { t;oT {Hge
int[] temp=new int[data.length]; .0?ss0~
mergeSort(data,temp,0,data.length-1); W6)dUi
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} 9t.fij
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private void mergeSort(int[] data,int[] temp,int l,int r){ )H.ubM1
int mid=(l+r)/2; |:dCVd<du
if(l==r) return ; -,[~~
mergeSort(data,temp,l,mid); M^Q&A R'F
mergeSort(data,temp,mid+1,r); U.d'a~pH
for(int i=l;i<=r;i++){ ?G2qlna
temp=data; :v|r= #OI
} \,$r,6-g
int i1=l; Mr#oT?
int i2=mid+1; XB6N[E
for(int cur=l;cur<=r;cur++){ ^)(G(=-Rf
if(i1==mid+1) K]*g, s+
data[cur]=temp[i2++]; TJeou#=/
else if(i2>r) Vi Cg|1c
data[cur]=temp[i1++]; _G_ &Me0
else if(temp[i1] data[cur]=temp[i1++]; Z $ p^v*y
else 8L%%eM_O
data[cur]=temp[i2++]; Lw!?T(SK
} e5]&1^+
} Y8x(#qp,
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} fRZUY<t
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改进后的归并排序: oHYD_8'f
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package org.rut.util.algorithm.support; GGFar\
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import org.rut.util.algorithm.SortUtil; +!mNm?H[!
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/** XHwZ+=v
* @author treeroot yfRUTG
* @since 2006-2-2 Pu/-Qpqh
* @version 1.0 n"K {uj))
*/ PV5TG39qQ
public class ImprovedMergeSort implements SortUtil.Sort { +ZD[[+
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private static final int THRESHOLD = 10; I@y2HxM
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/* eG[umv.9b
* (non-Javadoc) < -@,
* \N'hbT=
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) H|UV+Q0,
*/ e+d6R[`M
public void sort(int[] data) { (;Dn%kK
int[] temp=new int[data.length]; Ba\wq:
mergeSort(data,temp,0,data.length-1); '&_y*"/c
} Vsm%h^]d
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private void mergeSort(int[] data, int[] temp, int l, int r) { =/ !{<^0
int i, j, k; &VZmP5Gv
int mid = (l + r) / 2; 7DC0 W|Fe
if (l == r) J*^,l`C/
return; D>"{H7mY
if ((mid - l) >= THRESHOLD) r(?'Y y
mergeSort(data, temp, l, mid); 3;-@<9
else h[[/p {z
insertSort(data, l, mid - l + 1); toYg$IV
if ((r - mid) > THRESHOLD) q~:'R
mergeSort(data, temp, mid + 1, r); #qiGOpTF.
else FS]+s>
insertSort(data, mid + 1, r - mid); 1o5Y9#7
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for (i = l; i <= mid; i++) { ]C!Y~
temp = data; .SKNIct
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} nIN%<3U2
for (j = 1; j <= r - mid; j++) { (x@i,Ba@
temp[r - j + 1] = data[j + mid]; yEw"8u'
} 3ZJagJ\O
int a = temp[l]; )W}/k$S
int b = temp[r]; f@xfb
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for (i = l, j = r, k = l; k <= r; k++) { Ep,0Z*j
if (a < b) { DbNi;m
data[k] = temp[i++]; >w]k3MC
a = temp; {pQ@0b
} else { lJz?QI1
data[k] = temp[j--]; )2^/?jK
b = temp[j]; I vl^,{4
} 3Mh,NQB
} 1l`s1C
} >I8hFtAM
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/** #&`WMLl+8
* @param data {p lmFV
* @param l ]rX?n
* @param i )(|0KarF
*/ =Gg)GSL^
private void insertSort(int[] data, int start, int len) { $X<<JnsK
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 39a]B`y
} &T{B~i3w8
} %OfDTs
} HV.|Eh_7
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}