归并排序: 0jip::x
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package org.rut.util.algorithm.support; .=et{\
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import org.rut.util.algorithm.SortUtil; _Ex*%Qf.
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/** hi4h0\L!}
* @author treeroot &deZ
* @since 2006-2-2 0|K/=dh5+
* @version 1.0 4EaSg#
*/ .O@q5G
public class MergeSort implements SortUtil.Sort{ {7ZtOe
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/* (non-Javadoc) #w%a
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) =+SVzK,+3
*/ YI? C-,
public void sort(int[] data) { Nv*E .|G
int[] temp=new int[data.length]; S4aHce5PXA
mergeSort(data,temp,0,data.length-1); a
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} 2f}K#i8
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private void mergeSort(int[] data,int[] temp,int l,int r){ u+I r:k
int mid=(l+r)/2; /w}B07.
if(l==r) return ; D=q;+,Pc
mergeSort(data,temp,l,mid); O[5_9W
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mergeSort(data,temp,mid+1,r); d-#u/{jG)
for(int i=l;i<=r;i++){ y. ivz
temp=data; &?5{z\;1"
} 6S&=OK^
int i1=l; g~$GE},,
int i2=mid+1; @FnI?Rx
for(int cur=l;cur<=r;cur++){ Ok~W@sYST
if(i1==mid+1) >TQBRA;'
data[cur]=temp[i2++]; GP7)m
else if(i2>r) >TY5ZRB
data[cur]=temp[i1++]; vS24;:f
else if(temp[i1] data[cur]=temp[i1++]; [iO$ c]!H
else ,;+91lR3
data[cur]=temp[i2++]; P(YG@
} wn A%Nh7
} ftI+#0?[!
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改进后的归并排序: n.)[MC}
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package org.rut.util.algorithm.support; ou,=MpXx*
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import org.rut.util.algorithm.SortUtil; -'p@ lk
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/** !>Qc2&ZV
* @author treeroot L->f=
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* @since 2006-2-2 z
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* @version 1.0 _c(C;s3o
*/ N|Cy!E=d
public class ImprovedMergeSort implements SortUtil.Sort { #@\NdW\
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private static final int THRESHOLD = 10; ,Q /nS$
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/* D@4&@>
* (non-Javadoc) ~b6<uRnM.
* kvgs $
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ,wb|?>Y
*/ fj
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public void sort(int[] data) { $ DZQdhv
int[] temp=new int[data.length];
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mergeSort(data,temp,0,data.length-1); ]Re~V{uh
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private void mergeSort(int[] data, int[] temp, int l, int r) { g0:4zeL
int i, j, k; f;tyoN0wHx
int mid = (l + r) / 2; mTuB*
if (l == r) 5c}9
return; :!iPn%
if ((mid - l) >= THRESHOLD) >&TnTv?I
mergeSort(data, temp, l, mid); -C'X4C+
else c%LB|(@j{
insertSort(data, l, mid - l + 1);
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if ((r - mid) > THRESHOLD) .dKRIFo
mergeSort(data, temp, mid + 1, r); yL3<X w|
else 7U[L\1zS
insertSort(data, mid + 1, r - mid); <Ec)m69P
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for (i = l; i <= mid; i++) { kW2nrkF
temp = data; K%TKQ<R|
} r(in]7
for (j = 1; j <= r - mid; j++) { ]20"la5
temp[r - j + 1] = data[j + mid]; >pH775I=
} tId !C
int a = temp[l]; `TlUJ]d)
int b = temp[r]; "k1Tsd-
for (i = l, j = r, k = l; k <= r; k++) { =@jMx^A"
if (a < b) { %`\_l
data[k] = temp[i++]; /jn3'q_,
a = temp; 4@mXtA
} else { }
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data[k] = temp[j--]; i(f;'fb*
b = temp[j]; j.'"CU
} \`p~b(
} FvNSu"O~K1
} v.LUK
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/** V&+$Vq
* @param data eeJt4DV8v
* @param l B%g :Z
* @param i :k )<1ua
*/ eZod}~J8
private void insertSort(int[] data, int start, int len) { ocuVDC
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); UrcN?
} !>2\OSp!
} v{{2<,l
} hYUV9k:
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}