归并排序: 2]5ux!Lqln
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package org.rut.util.algorithm.support; {>d\
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import org.rut.util.algorithm.SortUtil; bwK1XlfD.s
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/** v<ati c
* @author treeroot nFjaV`6`@
* @since 2006-2-2 2UMX%+ "J
* @version 1.0
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*/ n[7=
public class MergeSort implements SortUtil.Sort{ @`nU=kY/
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/* (non-Javadoc) BO>[\!=y
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) v807)JwS
*/ dF^`6-K1
public void sort(int[] data) { g{Hb3id9
int[] temp=new int[data.length]; L,3%}_
mergeSort(data,temp,0,data.length-1); ,Qt2 ?
} wc ;^C?PX
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private void mergeSort(int[] data,int[] temp,int l,int r){ Y+C6+I<3
int mid=(l+r)/2; ([NS%
if(l==r) return ; (/|f6_9!
mergeSort(data,temp,l,mid); *X2dS
{
mergeSort(data,temp,mid+1,r); RaA7 U
for(int i=l;i<=r;i++){ H284
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temp=data; -l<[CI
} FXbalQ?^
int i1=l; QaLVIsnfN
int i2=mid+1; |iVw7M:
for(int cur=l;cur<=r;cur++){ +L
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if(i1==mid+1) 9-.`~v
data[cur]=temp[i2++]; bKQ-PM&I/t
else if(i2>r) nC\LDeKc
data[cur]=temp[i1++]; R}$A>)%dx
else if(temp[i1] data[cur]=temp[i1++];
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else }^PdW3O*m,
data[cur]=temp[i2++]; t.]e8=dE
} wTn"
} 5xc-MkIRL
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改进后的归并排序: 7.B]B,]
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package org.rut.util.algorithm.support; 'Inqa;TQz
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import org.rut.util.algorithm.SortUtil; 6}q# c
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/** FhMl+Ou
* @author treeroot $c24l J#/
* @since 2006-2-2 {pEbi)CF,}
* @version 1.0 !Baq4V?KN
*/ fg8U*7
public class ImprovedMergeSort implements SortUtil.Sort {
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private static final int THRESHOLD = 10; EXT_x q
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/* lof}isOz
* (non-Javadoc) WAp#[mW.fx
* n*i1QC
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ' Y.s}Duj
*/ @W*Zrc1NF
public void sort(int[] data) { c>e~$b8
int[] temp=new int[data.length]; qEB]Tj e[
mergeSort(data,temp,0,data.length-1); .\b# 0w
} xZ(VvINL'
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private void mergeSort(int[] data, int[] temp, int l, int r) { x 0x/2re
int i, j, k; } T1~fa
int mid = (l + r) / 2; $,B@yiie
if (l == r) UZqk2D
return; V7i1BR8G
if ((mid - l) >= THRESHOLD) |.[4$C
mergeSort(data, temp, l, mid); #[ hJm'G
else 0Xw3h^%
insertSort(data, l, mid - l + 1); e025m}%SU
if ((r - mid) > THRESHOLD) s1NRUV2E
mergeSort(data, temp, mid + 1, r); :1\QM'O
else WjvD C"
insertSort(data, mid + 1, r - mid); gDjs:]/YR
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for (i = l; i <= mid; i++) { LVp*YOq7
temp = data; ]Vgl
} do(komP<\
for (j = 1; j <= r - mid; j++) { J2adA9R/,
temp[r - j + 1] = data[j + mid]; Qd$!?h
} l/w<R
int a = temp[l]; #35@YMF
int b = temp[r]; . ;q4<_
for (i = l, j = r, k = l; k <= r; k++) { P(&9S` I
if (a < b) { VwV`tKit
data[k] = temp[i++]; -964#>n[
a = temp; GS4
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} else { ce\ F~8y
data[k] = temp[j--]; zg83->[
b = temp[j]; V_"K
} P2;I0 !
} 0qrsf!
} *PJg~F%
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/** -O-qEQd
* @param data xl~%hwBd
* @param l x0!5z1KQh
* @param i ;Y>cegG\
*/ RZeU{u<O
private void insertSort(int[] data, int start, int len) { #]!0$z|Z
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); ^N5BJ'[F:
} |_J[n!~f7
} idr,s\$>
} 9(( QSX
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}