归并排序: ?p>m;Aq
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package org.rut.util.algorithm.support; N \woFrG
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import org.rut.util.algorithm.SortUtil; t24.u+O
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/** |[$TT$Fb
* @author treeroot OS=~<ba
* @since 2006-2-2 z :A_
* @version 1.0 :VX2&*
*/ BfD C[(n`
public class MergeSort implements SortUtil.Sort{ L!Gpk)}[i
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/* (non-Javadoc) QGnUPiD^
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) VP1z"j:
*/ Dp?lgw
public void sort(int[] data) { ,S&p\(r.
int[] temp=new int[data.length]; bMqFrG
mergeSort(data,temp,0,data.length-1); {wf5HA
} u/J1Z>0
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private void mergeSort(int[] data,int[] temp,int l,int r){ RvyCc!d
int mid=(l+r)/2; HgTBON(
if(l==r) return ;
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mergeSort(data,temp,l,mid); Y,-!QFS#
mergeSort(data,temp,mid+1,r); X: QRy9]
for(int i=l;i<=r;i++){ pwA~?$B1
temp=data; P6`LUyz3
} a._>?rVy
int i1=l; jEL"Q?#
int i2=mid+1; 3s#/d,+
for(int cur=l;cur<=r;cur++){ :b,An'H
if(i1==mid+1) n/%M9osF
data[cur]=temp[i2++]; =Nr?F'<
else if(i2>r) Q3[nS(#Z/=
data[cur]=temp[i1++]; r%`3*<ALV)
else if(temp[i1] data[cur]=temp[i1++]; p & i+i
else MSe>1L2=
data[cur]=temp[i2++]; AH^ud*3F
} IB^vEY!`6_
} jM>;l6l
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改进后的归并排序: aX*7tRn_%
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package org.rut.util.algorithm.support; +9.GNu
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import org.rut.util.algorithm.SortUtil; !14l[k+\
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/** P&*e\"{
* @author treeroot 'wo}1^V
* @since 2006-2-2 X*`b}^T
* @version 1.0 6Z;D`X,5
*/ "||'
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public class ImprovedMergeSort implements SortUtil.Sort { Rpxg
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private static final int THRESHOLD = 10; fbJa$
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/* )IKqO:@
* (non-Javadoc) !#S"[q
* Q 34-a"6)
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) P8 R^46
*/ J>fq5
public void sort(int[] data) { CT(HTu
int[] temp=new int[data.length]; Wli!s~c5Fo
mergeSort(data,temp,0,data.length-1); /&5:v%L
} N"zl7 .E
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private void mergeSort(int[] data, int[] temp, int l, int r) { CUj$ <ay=
int i, j, k; Li\b,_C
int mid = (l + r) / 2; b\H,+|iK
if (l == r) 9jllW[`2F
return; \\Nt^j3qR
if ((mid - l) >= THRESHOLD) 0RN 7hpf&`
mergeSort(data, temp, l, mid); J5}?<Dd:
else (Vt5@25JW
insertSort(data, l, mid - l + 1); %:7/ym[
if ((r - mid) > THRESHOLD) !)(To
mergeSort(data, temp, mid + 1, r); ,t39~w
else Sb`SJ):x
insertSort(data, mid + 1, r - mid); fdgjTX
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for (i = l; i <= mid; i++) { eH%i8a
temp = data; y_T%xWK5
} h@Ix9!?+
for (j = 1; j <= r - mid; j++) { jgBJs^JgYG
temp[r - j + 1] = data[j + mid]; q'%!qa+
} a4",BDx
int a = temp[l]; G'Uq595'-
int b = temp[r]; wYh]3
for (i = l, j = r, k = l; k <= r; k++) { o)H|
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if (a < b) { w}
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data[k] = temp[i++]; J,k.*t:
a = temp; #,OiZQJC
} else { i"n1E@
data[k] = temp[j--]; sfsK[c5bm
b = temp[j]; 9 $zx<O
} Jjh=zxR>
} VgMuX3=
} 0kaMYV?
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/** }p*WH$!~
* @param data M+7jJ?n
* @param l kMg[YQ]OC
* @param i avUdvV-
*/ +d3h @gp
private void insertSort(int[] data, int start, int len) { [V0%=q+ R
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 3C2~heO>|
} cd4HbSp
} ;kD
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} DK#Tr: 7
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}