归并排序: t&Z:G<;
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package org.rut.util.algorithm.support; cy4V*zwp
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import org.rut.util.algorithm.SortUtil; _K|513I
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/** NI%
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* @author treeroot @awN*mO
* @since 2006-2-2 0qMf6
* @version 1.0 OgBZoTT
*/ E[E[Za^Y
public class MergeSort implements SortUtil.Sort{ RVb}R<yU+
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/* (non-Javadoc) ZVmgQ7m
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) OQZ\/~o 5
*/ EL-1o02-
public void sort(int[] data) { IEJp!P,E
int[] temp=new int[data.length]; IOi 6'
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mergeSort(data,temp,0,data.length-1); B|+tK
} S)d_A
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private void mergeSort(int[] data,int[] temp,int l,int r){ #y%?A;
int mid=(l+r)/2; LXQ-J
if(l==r) return ; !t92_y3
mergeSort(data,temp,l,mid); bAqaf#}e
mergeSort(data,temp,mid+1,r); iv62Fs'
for(int i=l;i<=r;i++){ l<#*[TJ
temp=data; k,nRC~Irh
} 1u0NG)*f
int i1=l; ,zY!EHpx
int i2=mid+1; Zf%6U[{ T
for(int cur=l;cur<=r;cur++){ SZQ4e
if(i1==mid+1) S\O6B1<:
data[cur]=temp[i2++]; xkzC+ _A
else if(i2>r) SRx `m,535
data[cur]=temp[i1++]; 3xnu SOdh
else if(temp[i1] data[cur]=temp[i1++]; |k^ *
else (j;6}@
data[cur]=temp[i2++]; " |l-NUe
} ,:QDl
} 4l*4wx""v
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} ;{Kx$Yt+
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改进后的归并排序: W!BIz&SY:-
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package org.rut.util.algorithm.support; W} U-u{Z
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import org.rut.util.algorithm.SortUtil; e-#!3j!'
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/** s$ 2@ |;
* @author treeroot *r k!`n&
* @since 2006-2-2 Mo2b"A;}|
* @version 1.0 s) vHLf4 T
*/ 6M`N| %
public class ImprovedMergeSort implements SortUtil.Sort { V5{^R+_)Ya
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private static final int THRESHOLD = 10; 0FV?By
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/* -a[]#v9
* (non-Javadoc) v*7lJNN.
* ?Q)z5i'g#
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) eY1$smh t
*/ fscAG\>8
public void sort(int[] data) { 5/O;&[l Yy
int[] temp=new int[data.length]; ?X.MKNbp
mergeSort(data,temp,0,data.length-1); bvMa|;f1
} 3:h9cO/9
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private void mergeSort(int[] data, int[] temp, int l, int r) { cR1dGNcp/@
int i, j, k; yw%5W=<
int mid = (l + r) / 2; JL4\%
if (l == r) Ppzd.=E
return; +89s+4Jn
if ((mid - l) >= THRESHOLD) bt,^-gt@
mergeSort(data, temp, l, mid); &ns !\!
else #D$vH
insertSort(data, l, mid - l + 1); *|RQ
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if ((r - mid) > THRESHOLD) siHS@S
mergeSort(data, temp, mid + 1, r); YolO-5
else -m:i~^
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insertSort(data, mid + 1, r - mid); q1Si*?2W
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for (i = l; i <= mid; i++) { H3"[zg9L:a
temp = data; n#G
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} ^ )Lh5
for (j = 1; j <= r - mid; j++) { Xh/i5}5 t
temp[r - j + 1] = data[j + mid]; ?[K+Ym+
} w`vJE!4B
int a = temp[l]; iTt"Ik'
int b = temp[r]; wR?M2*ri
for (i = l, j = r, k = l; k <= r; k++) { -k
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if (a < b) { ,))UQ7N
data[k] = temp[i++]; [UVxtM J
a = temp; $C UmRi{T
} else { ,Z;z}{.hq
data[k] = temp[j--]; Ok+zUA[Wu
b = temp[j]; 7RmL#f`
} av( d0E}}b
} D@yg)$;z
} VJX{2$L
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/** gOI#$-L
* @param data `MgR/@%hr
* @param l `CI9~h@k
* @param i \guZc}V]:\
*/ )*I=>v.Jq
private void insertSort(int[] data, int start, int len) { %6}S'yL
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); j[XA"DZR<
} *Rv eR?kO
} n<p`OKIV3
} :>$)Snqo=n
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}