归并排序: nUqy1(
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package org.rut.util.algorithm.support; fNxw&ke8&
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import org.rut.util.algorithm.SortUtil; WFh@%j
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/** IxP^i{/1?
* @author treeroot A[9NP-~
* @since 2006-2-2 }J;~P
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* @version 1.0 1l]C5P}E
*/ STlPT5e.}
public class MergeSort implements SortUtil.Sort{ 4$i} Xk#3
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/* (non-Javadoc) t&f" jPu>
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) *:#Z+7x
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*/ {5 Kz' FT
public void sort(int[] data) { )OUU]MUH
int[] temp=new int[data.length]; ;.0LRWcJ
mergeSort(data,temp,0,data.length-1); hNVMz`r
} ;@!;1KDy
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private void mergeSort(int[] data,int[] temp,int l,int r){ QRagz,c
int mid=(l+r)/2; ".M:`BoW4
if(l==r) return ; qvN"1=nJ
mergeSort(data,temp,l,mid); ;*`_#Rn#
mergeSort(data,temp,mid+1,r); V g6S/-
for(int i=l;i<=r;i++){ ~*kK4]lP
temp=data; '8={ sMy
} Bn_g-WrT
int i1=l; 9F)W19i.
int i2=mid+1; z"3H{ A
for(int cur=l;cur<=r;cur++){ Cn/q=
if(i1==mid+1) 4L$};L
data[cur]=temp[i2++]; 0/*X=5
else if(i2>r) pLJeajv)z
data[cur]=temp[i1++]; ^@N`e1
else if(temp[i1] data[cur]=temp[i1++]; 7H?!RYrx
else No~6s.H
data[cur]=temp[i2++];
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} i2U/RXu
} Y}ky/?q
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} v'$ykZ!Z
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改进后的归并排序: '1lx{UzD
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package org.rut.util.algorithm.support; g.=!3e&z%
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import org.rut.util.algorithm.SortUtil; <@%ma2
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/** + f 6}p
* @author treeroot L% zuI& q
* @since 2006-2-2 -/1d&
* @version 1.0 *eMLbU7
*/ ?SB5b ,
public class ImprovedMergeSort implements SortUtil.Sort { 75PS^5T,
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private static final int THRESHOLD = 10; FmR\`yY_,
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/* jw/wcP
* (non-Javadoc) NCp%sGBmG
* ;Xz(B4 N~o
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) W0+u)gDDz
*/ p~ mN2x ]
public void sort(int[] data) { P%ye$SASd
int[] temp=new int[data.length]; 5NFq7&rJ6
mergeSort(data,temp,0,data.length-1); $2;-q8+
} ;%M2x5
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private void mergeSort(int[] data, int[] temp, int l, int r) { ?#x'_2
int i, j, k; 9j9YQ2
int mid = (l + r) / 2; rUGZjLIGqz
if (l == r) u87=q^$
return; T %$2k>
if ((mid - l) >= THRESHOLD) iz,]%<_PE
mergeSort(data, temp, l, mid); 3{6ps : w
else nqBG]y aI
insertSort(data, l, mid - l + 1); 1*TXDo_T
if ((r - mid) > THRESHOLD) JvT%R`i
mergeSort(data, temp, mid + 1, r); ?=TL2"L
else I=Gr^\x=
insertSort(data, mid + 1, r - mid); ,M| QN*
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for (i = l; i <= mid; i++) { CD*f4I#d
temp = data; 721{Ga4~S
} ,ZsYXW
for (j = 1; j <= r - mid; j++) { nYmf(DV
temp[r - j + 1] = data[j + mid]; gNG0k$nP
} };4pZceV
int a = temp[l]; oFX"F0rx
int b = temp[r]; Cb4d|yiS8
for (i = l, j = r, k = l; k <= r; k++) { _Ac/i r[,:
if (a < b) { (jD'+ "?
data[k] = temp[i++]; \HBVNBY
a = temp; N[- %0
} else { =ip~J<sw&
data[k] = temp[j--]; |_xZ/DT
b = temp[j]; m~A[V,os
} WsG"x>1n
} PT
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} 3sd{AkD^
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/** LC~CPV'F
* @param data 5P5A,K
* @param l cij]&$;Q
* @param i Qivf|H619
*/ iX0]g45o
private void insertSort(int[] data, int start, int len) { lo IL{2
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); ]{q-Y<{"
} 2tg/S=t}
} duZ|mT8Q==
} )3D+gu
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}