归并排序: )?#*GMWU
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package org.rut.util.algorithm.support; >58N P1[k
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import org.rut.util.algorithm.SortUtil; pj:s+7"t
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/** \ s^a4l2
* @author treeroot q(sEN!^L`
* @since 2006-2-2 =e2|:Ba!
* @version 1.0 sdF;H[
*/ T8( \:v
public class MergeSort implements SortUtil.Sort{ YqhZndktX
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/* (non-Javadoc) f8yE>qJP
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) b(JQ>,hX
*/ pvdM3+6
public void sort(int[] data) { !"~x.LX\
int[] temp=new int[data.length]; (jbHV.]P9
mergeSort(data,temp,0,data.length-1); oc+TsVt
} h>AK^fX
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private void mergeSort(int[] data,int[] temp,int l,int r){ 6-8,qk
int mid=(l+r)/2; K.s\xA5`_
if(l==r) return ; EXDZehLD<]
mergeSort(data,temp,l,mid); .)L%ANf
mergeSort(data,temp,mid+1,r); \c1u$'| v
for(int i=l;i<=r;i++){ 5VD(fW[OW]
temp=data; ]X
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}
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int i1=l; #-5.G>8
int i2=mid+1; W^{zlg
for(int cur=l;cur<=r;cur++){ !nh7<VJ
if(i1==mid+1) )Il)
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data[cur]=temp[i2++]; 28,Hd!{
else if(i2>r) VfWU-lJ
data[cur]=temp[i1++]; /J''`Tf
else if(temp[i1] data[cur]=temp[i1++]; LpCJfQ
else a"7zz]XO2
data[cur]=temp[i2++]; ~6YTm6o
} cu{c:z~
} m'{gO9V
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改进后的归并排序: X{cFqW7
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package org.rut.util.algorithm.support; D%[yAr;r
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import org.rut.util.algorithm.SortUtil; .[mI9dc
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/** v@m2c_,
* @author treeroot t&5N{C:
* @since 2006-2-2 O5X@'.#rU
* @version 1.0 in}d(%3h
*/ z~8`xn,
public class ImprovedMergeSort implements SortUtil.Sort { JZ=ahSi
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private static final int THRESHOLD = 10; P){b"`f
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/* -|F(qf
* (non-Javadoc) s{g^K#BoFi
* R( 2,1f=d
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) vwF#;jj\
*/ O_vCZW
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public void sort(int[] data) { jEK{QOq0
int[] temp=new int[data.length];
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mergeSort(data,temp,0,data.length-1); f/"?(7F
} }Pi}?
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private void mergeSort(int[] data, int[] temp, int l, int r) { Sq<ds}o'8l
int i, j, k; ;og[q
int mid = (l + r) / 2; [f ._w~
if (l == r) >)`yG'[
return; #bIUO2yVo
if ((mid - l) >= THRESHOLD) %?2:1o
mergeSort(data, temp, l, mid); Q[rmsk2L'
else Gl am(V1
insertSort(data, l, mid - l + 1); MBp,!_Q6
if ((r - mid) > THRESHOLD) M~h^~:Lk
mergeSort(data, temp, mid + 1, r); :~"Dwrui
else 9:\#GOg
insertSort(data, mid + 1, r - mid); \eH`{Z'.x5
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for (i = l; i <= mid; i++) { 6h5DvSO
temp = data; ][D/=-
} \d:AV(u
for (j = 1; j <= r - mid; j++) { y)//u:l
temp[r - j + 1] = data[j + mid]; @#u'z~a)
} s?j ||
int a = temp[l]; rlRRGJ\l
int b = temp[r]; Zqi;by%
for (i = l, j = r, k = l; k <= r; k++) { K^6fg,&
if (a < b) { r
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data[k] = temp[i++]; $bo,m2)
a = temp; Xi
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} else { e&k=fV
data[k] = temp[j--]; b^s>yN
b = temp[j]; m)\wbkC
} 506AvD
} B5R/GV
} ?xTdL738
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/** -a+oQP]O
* @param data Lb=4\ _
* @param l @Jh;YDr`A
* @param i paYvYK-K?
*/ %^qf0d*
private void insertSort(int[] data, int start, int len) { }f;cA
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); h\<;N*Xi
} )O:T\{7+
} #cCR\$-~
} [kp#
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}