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package org.rut.util.algorithm.support; RPH]@
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import org.rut.util.algorithm.SortUtil; !Db0r/_:G
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/** _FV<[x,nE8
* @author treeroot )`Zj:^bz9
* @since 2006-2-2 Jxyeh1zqB
* @version 1.0 w QV4[
*/ 0}(ZW~&1
public class MergeSort implements SortUtil.Sort{ [=Qv?am
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/* (non-Javadoc) }o>6 y>=
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) zGm#erE
*/
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public void sort(int[] data) { y,I ?3p|S
int[] temp=new int[data.length]; {Pi+VuLE
mergeSort(data,temp,0,data.length-1); }B-@lbK6)
} ;'^5$q
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private void mergeSort(int[] data,int[] temp,int l,int r){ ?fO
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int mid=(l+r)/2; 2.Kbj^
if(l==r) return ; Z_%9LxZlyj
mergeSort(data,temp,l,mid); }zA
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mergeSort(data,temp,mid+1,r); K6vF}A|
for(int i=l;i<=r;i++){ hqEnD
temp=data; PQ}q5?N
} ;4E.Yr*
int i1=l; M$|r8%z1
int i2=mid+1; 1h.Ypzu
for(int cur=l;cur<=r;cur++){ ho5mH{"OV
if(i1==mid+1) `R}q&|o7<
data[cur]=temp[i2++]; axf 4N@
else if(i2>r) /CpU.^V
data[cur]=temp[i1++]; S4n ~wo
else if(temp[i1] data[cur]=temp[i1++]; %}t<,ex(yO
else -}2'P)Xp
data[cur]=temp[i2++]; f7y a0%N
} 0RaE!4)!;
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改进后的归并排序: [^iQE
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package org.rut.util.algorithm.support; s)?=4zJ
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import org.rut.util.algorithm.SortUtil; <r[5 S5y
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/** *}yOL
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* @author treeroot :n1^Xw0q
* @since 2006-2-2 ?Hb5<,1u3
* @version 1.0 p&Os5zw;|
*/ D{%l 4og
public class ImprovedMergeSort implements SortUtil.Sort { }3G`f> s
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private static final int THRESHOLD = 10; +`;YK7o
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/* W(5et5DN,
* (non-Javadoc) `# N j8
* Z/y&;N4
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) jacp':T
*/ Dgb@`oo
public void sort(int[] data) { @S69u s}
int[] temp=new int[data.length]; a4zq`n|3U
mergeSort(data,temp,0,data.length-1); ba=-F4?
} iX3Y:
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private void mergeSort(int[] data, int[] temp, int l, int r) { '\vmm>
int i, j, k; fjc8@S5x9j
int mid = (l + r) / 2; .XD.'S
if (l == r) = F!_ivV
return; (MI8Kkb1d
if ((mid - l) >= THRESHOLD) p2v+sWO
mergeSort(data, temp, l, mid); i)vbmV
else zv1#PfO@)
insertSort(data, l, mid - l + 1); d0@&2hO
if ((r - mid) > THRESHOLD) S4r-s;U-v/
mergeSort(data, temp, mid + 1, r); `v]|x,l+C
else ?`m#Y&Oi
insertSort(data, mid + 1, r - mid); !B&OK&*
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for (i = l; i <= mid; i++) { O
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temp = data; Q]Kc<[E
} qDMVZb-(#
for (j = 1; j <= r - mid; j++) { K?M{=$N
temp[r - j + 1] = data[j + mid]; Y[(U~l,a+
} 1@xmzTC
int a = temp[l]; Dy_ayxm
int b = temp[r]; <Cbah%X
for (i = l, j = r, k = l; k <= r; k++) { B=4xZJPy
if (a < b) { MLu@|Xgh
data[k] = temp[i++]; QYm]&;EI
a = temp; Gr1WBYK
} else { **oaR
data[k] = temp[j--]; 7W)*IJ
b = temp[j]; 6c[&[L%
} ~,*=j~#h
} gpIq4Q<
} .u+ZrA#
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/** ,'7 X|z/_>
* @param data 3RwDIk?>%
* @param l rA=iBb3`
* @param i nUp, %z[
*/ ~\UH`_83[
private void insertSort(int[] data, int start, int len) { anM]khs?
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); _TGv"c@V
} ;x]CaG)f
} K\bA[5+N
} ,Pq@{i#
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}