归并排序: WhSQ>h!@s
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package org.rut.util.algorithm.support; e\ k=T}
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import org.rut.util.algorithm.SortUtil; C!B2.:ja
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/** +e%9P%[+
* @author treeroot @W=#gRqQPy
* @since 2006-2-2 xqO'FQO%
* @version 1.0 RERum
*/ zVZZdG~8
public class MergeSort implements SortUtil.Sort{ Jj|HeZ1C f
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/* (non-Javadoc) n%3rv?m7
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 2JYyvJ>
*/ /Bid:@R
public void sort(int[] data) { . 3=WE@M
int[] temp=new int[data.length]; y^pk)`y8
mergeSort(data,temp,0,data.length-1); RhnSQe
} -$?xR]( f
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private void mergeSort(int[] data,int[] temp,int l,int r){ Eg 5|XV
int mid=(l+r)/2; &iR>:=ksN
if(l==r) return ; 6/wAvPB$
mergeSort(data,temp,l,mid); CwTx7
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mergeSort(data,temp,mid+1,r); <O?iJ=$
for(int i=l;i<=r;i++){ Z BcZG
temp=data; 26yv w
} '73dsOTIT
int i1=l; J8J~$DU\Gv
int i2=mid+1; iRS )Z)
for(int cur=l;cur<=r;cur++){ ?zQ\u{]=
if(i1==mid+1) c\-5vw||b
data[cur]=temp[i2++]; syA*!Up
else if(i2>r) W @`Nn*S
data[cur]=temp[i1++]; 3)T'&HKQ
else if(temp[i1] data[cur]=temp[i1++]; *O#%hTYq
else kUmrJBh$
data[cur]=temp[i2++]; \^iJv~d
} E08FUAth]#
} "'4R_R
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改进后的归并排序: H`njKKdR
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package org.rut.util.algorithm.support; m(s(2wq"f
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import org.rut.util.algorithm.SortUtil; 36*"oD=@
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/** #gMMhB=
* @author treeroot #Bg88!-4
* @since 2006-2-2 CuR\JKdRo
* @version 1.0 ]IoJ(4f
*/ '+?AaR&p?
public class ImprovedMergeSort implements SortUtil.Sort { ?!U=S=8
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private static final int THRESHOLD = 10; 2S&e!d-
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/* Uy5IvG;O+
* (non-Javadoc) =zDU!< U
* @ JZ I
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ?FVX &{{V
*/ w>p0ldi
public void sort(int[] data) { @vss:'l
int[] temp=new int[data.length]; \6-x~%xK
mergeSort(data,temp,0,data.length-1); }tF/ca:XPQ
} -GD_xk
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private void mergeSort(int[] data, int[] temp, int l, int r) { NEa:
int i, j, k; &W-L`aFd0
int mid = (l + r) / 2; wOOBW0tj
if (l == r) dQYb)4ir
return; ^ ~:f02[D
if ((mid - l) >= THRESHOLD) +wXrQV
mergeSort(data, temp, l, mid); S(.AE@U
else iE=Yh
insertSort(data, l, mid - l + 1); =<e|<EwSZ
if ((r - mid) > THRESHOLD) (wEaa'XL
mergeSort(data, temp, mid + 1, r); L@HPU;<
else l_hM,]T0
insertSort(data, mid + 1, r - mid); P,k~! F^L
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for (i = l; i <= mid; i++) { kQ7$,K#
temp = data; WjW+EF8(
} L{jJDd
for (j = 1; j <= r - mid; j++) { E0'+]"B
temp[r - j + 1] = data[j + mid]; = I,O+^
} VLC<ju!
int a = temp[l]; B]L5K~d
int b = temp[r]; U&yXs'3a&
for (i = l, j = r, k = l; k <= r; k++) { .+MJ' bW
if (a < b) { <+o-{{E[
data[k] = temp[i++]; jl;_lcO
a = temp; rL3<r
} else { mEfI2P)#|
data[k] = temp[j--]; /vll*}}
b = temp[j]; 1
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} L6./b;
} |iKk'Rta4
} (9%
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/** Oi AZA<
* @param data -$**/~0zU
* @param l U`N|pPe:w
* @param i AD#]PSB
*/ V>ML-s9
private void insertSort(int[] data, int start, int len) { L^bt-QbhO
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 7K,Quq.%+
} :K>v
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} ( NWT/yBx
} L`;p.L
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}