归并排序: <[9{Lg*D
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package org.rut.util.algorithm.support; $GI2rzh
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import org.rut.util.algorithm.SortUtil; wBr$3:
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/** S%ULGX:@ga
* @author treeroot [UqJ3@>
* @since 2006-2-2 .qBL.b_`
* @version 1.0 0<3)K[m~H
*/ cB~D3a0Th
public class MergeSort implements SortUtil.Sort{ d51.Tbt#%7
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/* (non-Javadoc) [kfLT::mT
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) nt$VH
*/ B&J;yla6`d
public void sort(int[] data) { )TNAgTmqK
int[] temp=new int[data.length]; ?f{{{0$S
mergeSort(data,temp,0,data.length-1); [ 0?*J<d
} pwq a/Yi
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private void mergeSort(int[] data,int[] temp,int l,int r){ U&DD+4+28:
int mid=(l+r)/2; )2
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if(l==r) return ; k%UE^
mergeSort(data,temp,l,mid); n}NO"eF>-s
mergeSort(data,temp,mid+1,r); _ ^5w f
for(int i=l;i<=r;i++){ 3LT[?C]H$
temp=data; FdT@}
} Yvky=RM
int i1=l; -oSfp23u
int i2=mid+1; CxyL'k
for(int cur=l;cur<=r;cur++){ NkWU5E!
if(i1==mid+1) R*m=V{iu`
data[cur]=temp[i2++]; ZHQa}C+
else if(i2>r) ZbS*zKEW
data[cur]=temp[i1++]; eUa2"=M
else if(temp[i1] data[cur]=temp[i1++]; /,G -1E
else P)VysYb?
data[cur]=temp[i2++]; Yo`#G-]
} u 3&9R)J1
} 37:\X5)z/
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改进后的归并排序: K0681_bp
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package org.rut.util.algorithm.support; V\C$/8v
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import org.rut.util.algorithm.SortUtil; IF"-{@
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/** 5W
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* @author treeroot Ne6]?\Z
* @since 2006-2-2 V/
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* @version 1.0 s\7]"3:wD
*/ 2m$\]\kCUv
public class ImprovedMergeSort implements SortUtil.Sort { dd $}FlT
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private static final int THRESHOLD = 10; !F@9xG
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/* "mBX$t'gb
* (non-Javadoc) }p2YRTH x
* Q/JX8<7K
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) #!a}ZhIt
*/ ^ Tr )gik
public void sort(int[] data) { #M9rt~4
int[] temp=new int[data.length]; zjuU*$A4
mergeSort(data,temp,0,data.length-1); %T OYU(k
} w_O3];
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private void mergeSort(int[] data, int[] temp, int l, int r) { _A[k&nO!&J
int i, j, k; ,qo"i7c{:
int mid = (l + r) / 2; 6*!R'
if (l == r) L=Pz0
return; y@\R$`0J
if ((mid - l) >= THRESHOLD) p2(U'x
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mergeSort(data, temp, l, mid); :Adx7!6
else QX1rnVzg0
insertSort(data, l, mid - l + 1); `i'72\(
if ((r - mid) > THRESHOLD) 9GH11B_A
mergeSort(data, temp, mid + 1, r); b.Yl0Y
else WAzYnl'p
insertSort(data, mid + 1, r - mid); O.ce"5Y^
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for (i = l; i <= mid; i++) { gj\'1(Ju
temp = data; V3^=Mj2"
} 'G6M:IXno
for (j = 1; j <= r - mid; j++) { 9:JFG{M
temp[r - j + 1] = data[j + mid]; \]@XY_21
} 'dkKBLsx
int a = temp[l]; r)9&'m .:
int b = temp[r]; s>pOfXIx
for (i = l, j = r, k = l; k <= r; k++) { =V)88@W
if (a < b) { `cz%(Ry,
data[k] = temp[i++]; X^2Txm d
a = temp; p "J^
} else {
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data[k] = temp[j--]; }qqE2;{ND
b = temp[j]; ?PMF]ah
} lphELPh
} E[z8;A^:0
} dBB;dN
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/** Lq-Di|6q
* @param data Qh3V[br
* @param l k|ol+
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* @param i \Mi] !b|8
*/ +IRr&J*P
private void insertSort(int[] data, int start, int len) { dG}.T_l
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); W7j-siWJ
} Oq7R^t`b
} `|["{j}^
} rO_|_nV[
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}