归并排序: jO0"`|(]s
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package org.rut.util.algorithm.support; @P)2ZGG
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import org.rut.util.algorithm.SortUtil; koa-sy )#L
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/** r"|UgCc
* @author treeroot 5AbY 59
* @since 2006-2-2 #&}j'oD|N
* @version 1.0 XW.k%H4@
*/ Nu;?})tF
public class MergeSort implements SortUtil.Sort{ ^M)+2@6
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/* (non-Javadoc)
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 6r.#/' "
*/ #LR.1zZ
public void sort(int[] data) { k`((6
int[] temp=new int[data.length]; {)n@Rq\=v
mergeSort(data,temp,0,data.length-1); d:Oo5t)MN
} oZ_,WwnE
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private void mergeSort(int[] data,int[] temp,int l,int r){ >{)\GK0i7
int mid=(l+r)/2; nX_w F`n"
if(l==r) return ; 8ZF!}kb0F
mergeSort(data,temp,l,mid); Oz4vV_a&'
mergeSort(data,temp,mid+1,r); 6rMXv0)
for(int i=l;i<=r;i++){ \iRmGvT
temp=data; G1a56TIN~
} <{T5}"e
int i1=l; pkf$%{"e
int i2=mid+1; 2~l +2..
for(int cur=l;cur<=r;cur++){ xOx=Z\ c
if(i1==mid+1) /Un\P
data[cur]=temp[i2++]; - -\eYVh[
else if(i2>r) -EJj j {
data[cur]=temp[i1++]; .lAPlJOO
else if(temp[i1] data[cur]=temp[i1++]; ;efF]")
else xpJ=yxO
data[cur]=temp[i2++]; )Ut K9;@"
} I|l5e2j
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改进后的归并排序: 0g2rajS
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package org.rut.util.algorithm.support; &
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import org.rut.util.algorithm.SortUtil; 3Rhoul[S
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/** V aoqI
* @author treeroot mT/^F{c
* @since 2006-2-2 ^#t6/fY.#
* @version 1.0 }}Zg/(
*/ n?>|2>
public class ImprovedMergeSort implements SortUtil.Sort { EbeSl+iMx_
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private static final int THRESHOLD = 10; r PTfwhs
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/* !>N+a3
* (non-Javadoc) V,%K"b=
* }G "EdhSl
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) E[i#8_
*/ P:WxhO/
public void sort(int[] data) { di(H-=9G62
int[] temp=new int[data.length]; JAM]neKiX
mergeSort(data,temp,0,data.length-1); k(M"k!M
} Q-B/SX)!/
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private void mergeSort(int[] data, int[] temp, int l, int r) { jZQ{XMF
int i, j, k; ?-~<Vc*
int mid = (l + r) / 2; Z&4L///
if (l == r) ]a`"O
return; @r^s70{}
if ((mid - l) >= THRESHOLD) K,6{c^qf
mergeSort(data, temp, l, mid); 6b%IPbb
else })`z6d]3
insertSort(data, l, mid - l + 1); Nobu=
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if ((r - mid) > THRESHOLD) !xBJJ/K+|
mergeSort(data, temp, mid + 1, r); ;W|GUmADf
else 7PuYrJ
insertSort(data, mid + 1, r - mid); $=X>5B
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for (i = l; i <= mid; i++) { `Z#':0Z
temp = data; aI=Q_}8-
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for (j = 1; j <= r - mid; j++) { U<r!G;^`
temp[r - j + 1] = data[j + mid]; &EYoviFp
} y\4/M6
int a = temp[l]; *FC|v0D
int b = temp[r]; 7<=p*
for (i = l, j = r, k = l; k <= r; k++) { $BT[fJ'k
if (a < b) { ,6#%+u}f
data[k] = temp[i++]; [$uKI,l
a = temp; "LH!Trl@k
} else { vC^{,?@
data[k] = temp[j--]; I(WIT=Wi<
b = temp[j]; 4"3.7.<Q`
} ~{);Ab.9+
} uJlW$Oc:.
} rC]k'p2x
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/** m`n~-_
* @param data Jh<s '&FR
* @param l OSLZ7B^
* @param i ^ fyue~9u
*/ ,KD?kSIf
private void insertSort(int[] data, int start, int len) { | lZJt
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); Fa\jVFIQ
} ?Z4%u8Krvz
} Vy| 4k2
} Ud2Tn*QmI
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}