归并排序: YH33E~f
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package org.rut.util.algorithm.support; 4`@]jm
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import org.rut.util.algorithm.SortUtil; G1MuH%4
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/** ZbTU1Y/'
* @author treeroot *z4n2"<l
* @since 2006-2-2 qM
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* @version 1.0 '$u3i
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*/ 1Sox@Ko
public class MergeSort implements SortUtil.Sort{ BCV<( @c
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/* (non-Javadoc) +5Z0-N@
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) o)'u%m
*/ $ wGDk
public void sort(int[] data) { }49X
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int[] temp=new int[data.length]; ~S}>|q$
mergeSort(data,temp,0,data.length-1); 6zs&DOB
} %&KJtKe
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private void mergeSort(int[] data,int[] temp,int l,int r){ $Z)Dvy|
int mid=(l+r)/2; XQ.czj
if(l==r) return ; 8cn)ox|J[
mergeSort(data,temp,l,mid); .+3= H@8h
mergeSort(data,temp,mid+1,r); |+Z,
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for(int i=l;i<=r;i++){ l c)*HYqU
temp=data; ^.Cfa
} 03?TT,y$
int i1=l; =jdO2MgSg*
int i2=mid+1; ^,zE Nqg7
for(int cur=l;cur<=r;cur++){ qq}EXq ^
if(i1==mid+1) {<~0nLyJS
data[cur]=temp[i2++]; }J .f
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else if(i2>r) a,o)i8G9R<
data[cur]=temp[i1++]; KNU/Kc#
else if(temp[i1] data[cur]=temp[i1++]; U#G[#sd> K
else A0.)=q
data[cur]=temp[i2++]; 2UY0:ye
} V^aX^ ;
} ! *\)7D
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改进后的归并排序: y
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package org.rut.util.algorithm.support; ]c{Zh?0
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import org.rut.util.algorithm.SortUtil; lbrob' '+
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/** X0
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* @author treeroot ,c"_X8Fkx$
* @since 2006-2-2 QytqO{B^
* @version 1.0 FH}n]T
*/ ]g-(|X~>
public class ImprovedMergeSort implements SortUtil.Sort { #M*h)/d[A
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private static final int THRESHOLD = 10; |33pf7o
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/* uy\<t
* (non-Javadoc) T/G1v;]
* P\;lH"9
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) B&A4-w v
*/ [dFxW6n
public void sort(int[] data) { 8'J>@ uW
int[] temp=new int[data.length]; Wq
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mergeSort(data,temp,0,data.length-1); g#~ jF
} +]H9:ARI
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private void mergeSort(int[] data, int[] temp, int l, int r) { X>OO4SV
int i, j, k; Acr\2!))
int mid = (l + r) / 2; x<60=f[O2R
if (l == r) r/=v;4.W
return; !q~s-~d^
if ((mid - l) >= THRESHOLD) <uNBsYMuC
mergeSort(data, temp, l, mid); =]E(iR_&
else STu!v5XY}-
insertSort(data, l, mid - l + 1); g[Ah>
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if ((r - mid) > THRESHOLD) ;[WW,,!Y
mergeSort(data, temp, mid + 1, r); %@q52ZQ
else '1;Q'-/J
insertSort(data, mid + 1, r - mid); aWek<Y~+
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for (i = l; i <= mid; i++) { yCkfAx8]
temp = data; '-3AWBWI1
} !> b>"\b
for (j = 1; j <= r - mid; j++) { ]O',Ei^
temp[r - j + 1] = data[j + mid]; QU16X
} XyJ*>;q
int a = temp[l]; K"Vv=
int b = temp[r]; A/RHb^N
for (i = l, j = r, k = l; k <= r; k++) { }MY7<sMDOy
if (a < b) { #T
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data[k] = temp[i++]; z=<T[Uy
a = temp; a#FkoA~M
} else { CyO2Z
data[k] = temp[j--]; p%,:U8fOR
b = temp[j]; ElhTB
} x*}j$n( Oa
} `x$d8(1J`#
} `48jL3|
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/** '#$%f
* @param data !y$Hr[v
* @param l {%.
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* @param i <`5>;Xn=
*/ K"VphKvR
private void insertSort(int[] data, int start, int len) { LtbL[z>]
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); s4P8PDhz
} nlXg8t^G
} MBs]<(RJZ
} WK0?$[|=r
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}