归并排序: .j ?W>F
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package org.rut.util.algorithm.support; atj(eg
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import org.rut.util.algorithm.SortUtil; &5>Kl}7
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/** qv-8)MSr
* @author treeroot irZ])a
* @since 2006-2-2 ___~D
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* @version 1.0 M$wC=b
*/ <;lkUU(WT2
public class MergeSort implements SortUtil.Sort{ )7hqJa-V
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/* (non-Javadoc) }H53~@WP>
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) pd?Mf=>#
*/ 59LG{R2
public void sort(int[] data) { Ao 'l"-
int[] temp=new int[data.length]; -uS!\
mergeSort(data,temp,0,data.length-1); 1Yq!~8
} `Gs9Xmc|
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private void mergeSort(int[] data,int[] temp,int l,int r){ H8=N@l
int mid=(l+r)/2; GC-5X`Sq
if(l==r) return ; *tA1az-jO
mergeSort(data,temp,l,mid); [+Iz@0q
mergeSort(data,temp,mid+1,r); R*,MfV
for(int i=l;i<=r;i++){ jRa43ck
temp=data; 10Q ]67
} aj='b.2)
int i1=l; cZ,b?I"Q%
int i2=mid+1; x>K Or,f
for(int cur=l;cur<=r;cur++){ Ov@gh
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if(i1==mid+1) }J}-//[A
data[cur]=temp[i2++]; hE{K=Tz$
else if(i2>r) AI2)g1m
data[cur]=temp[i1++]; g&L!1<,
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else if(temp[i1] data[cur]=temp[i1++]; HZE#Ab*L
else ic:zsuEm
data[cur]=temp[i2++]; 2k~l$p>CN!
} E_rI?t^
} [jQp~&nY
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} T=DbBy0-
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改进后的归并排序: iQ67l\{R
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package org.rut.util.algorithm.support; K-)]
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import org.rut.util.algorithm.SortUtil; tAd%#:K
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/** |l^uEtG
* @author treeroot RMV/&85?y
* @since 2006-2-2 C^Yb\N}S
* @version 1.0 ma]F7dZ5
*/ tU5zF.%
public class ImprovedMergeSort implements SortUtil.Sort { gx/,)> E.
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private static final int THRESHOLD = 10; &J]K3w1p
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/* VBlYvZ;$*
* (non-Javadoc) nF]W,@u"h
* C[AqFo
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) "S]0
*/ )r?}P1J7
public void sort(int[] data) { xj)F55e?
int[] temp=new int[data.length]; nc29j_Id
mergeSort(data,temp,0,data.length-1); u@)U"FZ
} .hb:s,0mP
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private void mergeSort(int[] data, int[] temp, int l, int r) { %IA\pSE
int i, j, k; sE<V5`Z=
int mid = (l + r) / 2; %\#8{g
if (l == r) 2 a)xTA#
return; Mj3A5;#
if ((mid - l) >= THRESHOLD) gs[uD5oo<
mergeSort(data, temp, l, mid); ?=7cF
else J4C.+![!Ah
insertSort(data, l, mid - l + 1); 4Z=_,#h4.
if ((r - mid) > THRESHOLD) Q8tL[>Xt
mergeSort(data, temp, mid + 1, r); B]wk+8SMY.
else 2wg5#i
insertSort(data, mid + 1, r - mid); CsR$c,8X.
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for (i = l; i <= mid; i++) { \)904W5R
temp = data; =o(5_S.u;
} A`$%SVgFV^
for (j = 1; j <= r - mid; j++) { bo>*fNqAIy
temp[r - j + 1] = data[j + mid]; ek\ xx
} HZB>{O
int a = temp[l]; 5lmHotj#
int b = temp[r]; #Y`~(K47
for (i = l, j = r, k = l; k <= r; k++) { 7IH@oMvE
if (a < b) { ~
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data[k] = temp[i++]; l/GGCnO/
a = temp; k,6f
} else { G6P?2@
data[k] = temp[j--]; IqHV)A
b = temp[j]; #U4F0BdA
} sqwGsO$#
} X/!o\yyT
} rQs)O<jl
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