归并排序: \LdmGv@&
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package org.rut.util.algorithm.support; AXl!cgi
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import org.rut.util.algorithm.SortUtil; K\IYx|Hm a
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/** >d8x<|D
* @author treeroot b^[W_y
* @since 2006-2-2 *L%6qxl`V
* @version 1.0 %RQ C9!
*/ x">W u2
public class MergeSort implements SortUtil.Sort{ eVw\v#gd
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/* (non-Javadoc) .M9d*qp`S
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) }+91s'/c
*/ >=-GD2WK
public void sort(int[] data) { h4CTTe)
int[] temp=new int[data.length]; =tr1*s{
mergeSort(data,temp,0,data.length-1); YgE]d?_h
} r}/yi
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private void mergeSort(int[] data,int[] temp,int l,int r){ qwq/Xcv
int mid=(l+r)/2; @br@[RpB
if(l==r) return ; cGgM8
mergeSort(data,temp,l,mid); Y{B9`Z
mergeSort(data,temp,mid+1,r); P?9nTG
for(int i=l;i<=r;i++){ };&HhBc!g
temp=data; 9=t#5J#O
} tg.|$n
int i1=l; $ A-+E\vQ@
int i2=mid+1; Ts|--,
for(int cur=l;cur<=r;cur++){ -1qZqU$h
if(i1==mid+1) ;mDM5.iF
data[cur]=temp[i2++]; Ua):y) A
else if(i2>r) ^"3\iA:
data[cur]=temp[i1++]; 06 QU
else if(temp[i1] data[cur]=temp[i1++]; )!tCC-Cr
else e8$l0gzaD
data[cur]=temp[i2++]; =%!e(N'p
} vB[~pQ;Z
} i 3m3zXt
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} ,Pn-ZF
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改进后的归并排序: h }<0 /
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package org.rut.util.algorithm.support; :6XguU
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import org.rut.util.algorithm.SortUtil; /\ytr%7 ,'
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/** i=YXKe6fD
* @author treeroot puOC60zI
* @since 2006-2-2 N;uUx#z
* @version 1.0 t)` p@]j
*/ 8O>}k
public class ImprovedMergeSort implements SortUtil.Sort { VZ$=6CavH
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private static final int THRESHOLD = 10; /D<"wF }@J
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/* *l{yW"Su
* (non-Javadoc) r!7 Y'|
* :p' VbQZ{
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ^(ScgoXva
*/ j Fma|y
public void sort(int[] data) { [*)Z!)
int[] temp=new int[data.length]; btH _HE
mergeSort(data,temp,0,data.length-1); I^D0<lHl~
} ZsZcQj6G,
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private void mergeSort(int[] data, int[] temp, int l, int r) { z>;$im
int i, j, k; 9AHSs,.t
int mid = (l + r) / 2; -I":Z2.fR
if (l == r) P}V=*g
return; ,`32!i
if ((mid - l) >= THRESHOLD) 3LDsxE=N:q
mergeSort(data, temp, l, mid); QV qK
else [iS,#w`
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insertSort(data, l, mid - l + 1); ?7[alV ~
if ((r - mid) > THRESHOLD) /RT%0!
mergeSort(data, temp, mid + 1, r); :m'+tGs
else /\Z J
insertSort(data, mid + 1, r - mid); dRI^@n
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for (i = l; i <= mid; i++) { `TtXZ[gP}
temp = data; :B|Dr
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} Jq
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for (j = 1; j <= r - mid; j++) { 4 o(bxs"
temp[r - j + 1] = data[j + mid]; Sm-wH^~KA
} uS+k^
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int a = temp[l]; T[?6[,.
int b = temp[r]; ,RxYd6
for (i = l, j = r, k = l; k <= r; k++) { ^j )BKD-
if (a < b) { xd-XWXc
data[k] = temp[i++]; Vp}^NNYf
a = temp; in-C/m#
} else { U__(;
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data[k] = temp[j--]; 6rN(_Oi-
b = temp[j]; |o<8}Nja6
} #~L h#
} Ae uX Qt
} {HOy_Fiih
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/** -e u]:4
* @param data \5)h tL1F
* @param l Jb["4X;h
* @param i o*g|m.SjL
*/ h*B|fy4K9U
private void insertSort(int[] data, int start, int len) { zTbVp8\pI
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); M$Zo.Bl$(
} 2[fN\e{
} <M]h{BS=
} ^! 8P<y
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}