归并排序: *.0}3
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package org.rut.util.algorithm.support; ,YYyFMC7S
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import org.rut.util.algorithm.SortUtil; Fu0 dYN
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/** :?s~,G_*l
* @author treeroot Gpws_jw
* @since 2006-2-2 d0y
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* @version 1.0 CA)DQYp{
*/ Z5re Fok
public class MergeSort implements SortUtil.Sort{ NDW6UFd>1
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/* (non-Javadoc) D9M<>Xz)
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) #5xK&qA
*/ Y
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public void sort(int[] data) { ~6z<tyD^
int[] temp=new int[data.length]; 5A,@$yp+
mergeSort(data,temp,0,data.length-1); W3s>+yU
} 7*8R:X+^r
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private void mergeSort(int[] data,int[] temp,int l,int r){ @UCGsw
int mid=(l+r)/2; gwDQ@
if(l==r) return ; TT3GFP
mergeSort(data,temp,l,mid); \kU0D
mergeSort(data,temp,mid+1,r); aA?Uf~ "t
for(int i=l;i<=r;i++){ &FF%VUfQJ
temp=data; 96UL](l(`
}
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int i1=l; >4>!zZ
int i2=mid+1; ld8 E!t[
for(int cur=l;cur<=r;cur++){ S>isWte
if(i1==mid+1) iB;EV8E
data[cur]=temp[i2++]; ES[H^}|Gi
else if(i2>r) K,{P
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data[cur]=temp[i1++]; 'M>QA"*48E
else if(temp[i1] data[cur]=temp[i1++]; LeDty_
else ezn%*X
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data[cur]=temp[i2++]; MaDdiyeC
} 68
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改进后的归并排序:
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package org.rut.util.algorithm.support; k%|7H,7
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import org.rut.util.algorithm.SortUtil; dWbSrl
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/** RKoM49W
* @author treeroot jC3ta
* @since 2006-2-2 EkotVzR5
* @version 1.0 f%fD>a
*/ `yYo Vu*
public class ImprovedMergeSort implements SortUtil.Sort { U.]5UP:a
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private static final int THRESHOLD = 10; e 4-
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/* u~WBu|
* (non-Javadoc) npC:SrI%
* l"70|~
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) w U".^
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*/ 8aDhHXI
public void sort(int[] data) { s8L=:hiSf)
int[] temp=new int[data.length]; 32nB9[l
mergeSort(data,temp,0,data.length-1); "M#A `b
} :.8@ xVH
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private void mergeSort(int[] data, int[] temp, int l, int r) { 0LEJnl
int i, j, k; -D*,*L
int mid = (l + r) / 2; {nvF>
if (l == r) ctI=|K
return; \*x'7c/qg
if ((mid - l) >= THRESHOLD) rCt8Q&mzf
mergeSort(data, temp, l, mid); i\~@2
else NWnUXR
insertSort(data, l, mid - l + 1); ^3re*u4b=
if ((r - mid) > THRESHOLD) M)sM G
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mergeSort(data, temp, mid + 1, r); $*N^bj
else *AK{GfP_
insertSort(data, mid + 1, r - mid); ]fxYSm
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for (i = l; i <= mid; i++) { L@9@3?
temp = data; @JB9qT
} \ZNUt$\
for (j = 1; j <= r - mid; j++) { yW3!V-iA
temp[r - j + 1] = data[j + mid]; RuyqB>[o
} 'W'['TV
int a = temp[l]; 9)P-<
int b = temp[r]; :wWPEhK
for (i = l, j = r, k = l; k <= r; k++) { lICpfcc(+
if (a < b) { `"@Pr,L
data[k] = temp[i++]; <}Hfu-PLo
a = temp; 1jHugss9|
} else { p>Z18
data[k] = temp[j--]; ,xcm:;&
b = temp[j]; ckDWY<@v
} 7 ) Q>R
} :Vdo.uUa
} i|N%dl+T=
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/**
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* @param data |q+3X)Y
* @param l tW$Di*h
* @param i dWKjVf
*/ wE*o1.
private void insertSort(int[] data, int start, int len) { 9):h
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for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); oU|yBs1
} :8(
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} `^d [$IbDW
} hCpX#rg?
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}