归并排序: 90Pl$#cb2
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package org.rut.util.algorithm.support; f0A{W/0n
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import org.rut.util.algorithm.SortUtil; 9FoHD
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/** j
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* @author treeroot b`(}.r?W
* @since 2006-2-2 Q`~jw>x
* @version 1.0 *jLJcb*.Ap
*/
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public class MergeSort implements SortUtil.Sort{ 9"NF/)_
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/* (non-Javadoc) ,ly\Ka?zO
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) u$h
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*/ [I0:=yJ+
public void sort(int[] data) { Gp1?iX?ml
int[] temp=new int[data.length]; V n7*JS
mergeSort(data,temp,0,data.length-1); 8H;t_B
} R}'bP
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private void mergeSort(int[] data,int[] temp,int l,int r){ f6EZ(
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int mid=(l+r)/2; @u.58H& }R
if(l==r) return ; bG 7O
mergeSort(data,temp,l,mid); 2-&k^Gl!:
mergeSort(data,temp,mid+1,r); 8N!b>??
for(int i=l;i<=r;i++){ r/4``shg
temp=data; O&vVv _zh
} nv GF2(;l
int i1=l; J
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int i2=mid+1; M.Y~1c4f
for(int cur=l;cur<=r;cur++){ LE&RY[
if(i1==mid+1) uya.sF0]9B
data[cur]=temp[i2++]; 0bz'&
else if(i2>r) %WSo b@f8
data[cur]=temp[i1++]; yaD~1"GA'O
else if(temp[i1] data[cur]=temp[i1++]; nePfuG]Q
else Vdtry@Q
data[cur]=temp[i2++]; :imW\@u
} x%}^hiO<q
} wy yWyf
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改进后的归并排序:
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package org.rut.util.algorithm.support; K:!"+q
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import org.rut.util.algorithm.SortUtil; ~KHVY)@P
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/** E'G4Y-
* @author treeroot 4\y/'`xm)6
* @since 2006-2-2 RzBF~2 >i
* @version 1.0 {F3xJ[
*/ 2#P*,
public class ImprovedMergeSort implements SortUtil.Sort { !HrKXy0{
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private static final int THRESHOLD = 10; rv&<{@AS~
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/* 5Eg1Q
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* (non-Javadoc) $@"l#vJPfc
* <PapskO>
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) "*m_> IU
*/ j2ve^F:Q
public void sort(int[] data) { ~$ng^D
int[] temp=new int[data.length]; I`p+Qt
mergeSort(data,temp,0,data.length-1); e^d0zl{
} u6T+Cg
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private void mergeSort(int[] data, int[] temp, int l, int r) { TFH \K{DM
int i, j, k; :axRoRg
int mid = (l + r) / 2; a&tSj35*6
if (l == r) +,2:g}5
return; EKA#|^Q:NX
if ((mid - l) >= THRESHOLD) ]+(6,ct&.
mergeSort(data, temp, l, mid); }vZ+A
else |?rNy=P,
insertSort(data, l, mid - l + 1); +g` 'J$
if ((r - mid) > THRESHOLD) kgnmGuka
mergeSort(data, temp, mid + 1, r); UF?H>Y&
else /]=C{)8
insertSort(data, mid + 1, r - mid); P\w\N2
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for (i = l; i <= mid; i++) { Anscr
temp = data; )^m%i]L_
} ]e^c=O`$
for (j = 1; j <= r - mid; j++) { xgpi-l
temp[r - j + 1] = data[j + mid]; hJn%mdx~w|
} p<zSJLN
int a = temp[l]; &=#[(vl
int b = temp[r]; V^JV4 `o
for (i = l, j = r, k = l; k <= r; k++) { #bMuvaP~
if (a < b) { ;ado0-VQi'
data[k] = temp[i++]; `&KwtvkdI
a = temp; X}tVmO?
} else { <<(wa
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data[k] = temp[j--]; 8S%52W|
b = temp[j]; T?
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} Db)?i?o}t
} 0/!dUWdKH
} "ul {d(K3
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/** y9_K, g
* @param data #>%X_o-o23
* @param l RT)d ]u
* @param i BlXB7q,
*/ L%Ow#.[C2
private void insertSort(int[] data, int start, int len) { 5#> 8MU?&
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); _acE:H
} [* @5\NWR}
} >c9a0A
} NbC@z9Q
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}