归并排序: *b(wVvz
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package org.rut.util.algorithm.support; RNJFSD.
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import org.rut.util.algorithm.SortUtil; jRZ%}KX
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/** 5a`%)K
* @author treeroot |WQ9a' '
* @since 2006-2-2 O_,O,1
* @version 1.0 &]p}+{ (>
*/ ".2K9j7$
public class MergeSort implements SortUtil.Sort{ f_mhD dq
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/* (non-Javadoc) L^Wz vv]
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) &V=7D# L
*/ 6DF
public void sort(int[] data) { Nud,\mXrY[
int[] temp=new int[data.length]; mO rWJ~=
mergeSort(data,temp,0,data.length-1); G$WOzY(
} !AHAS
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private void mergeSort(int[] data,int[] temp,int l,int r){ _]>JB0IY
int mid=(l+r)/2; *7gT}O;p 5
if(l==r) return ; S\C*iGeqJ
mergeSort(data,temp,l,mid); |^n3{m
mergeSort(data,temp,mid+1,r); !>.vh]8g
for(int i=l;i<=r;i++){ nS.G~c|
temp=data; rj]
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} Zc5
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int i1=l; 9M$/=>^
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int i2=mid+1; sRRI3y@
for(int cur=l;cur<=r;cur++){ dbGgD=}o
if(i1==mid+1) c$M%G)P
data[cur]=temp[i2++]; /Bv#) -5
else if(i2>r) ETw]!
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data[cur]=temp[i1++]; t%0?N<9YkU
else if(temp[i1] data[cur]=temp[i1++]; I*)VZW
else >9K//co"of
data[cur]=temp[i2++]; n]? WCG}cd
} 0&w0aP`Y
} }p3b#fAr
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} *>
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改进后的归并排序: [=M%
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package org.rut.util.algorithm.support; K'b*A$5o
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import org.rut.util.algorithm.SortUtil; L10IF
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/** |"7Pv
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* @author treeroot S3\jcgrS
* @since 2006-2-2 >.%4~\U
* @version 1.0 Epjff@7A
*/ @PkJY
public class ImprovedMergeSort implements SortUtil.Sort { vs9?+3
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private static final int THRESHOLD = 10; MgJ5B(c
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/* [/9(NUf
* (non-Javadoc) 8e:vWgQpL
* %vqT#+x
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) [1Dm<G
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*/ MWwJzVL8
public void sort(int[] data) { 3(_!`0#F%
int[] temp=new int[data.length]; )iE"Tl
mergeSort(data,temp,0,data.length-1); BSUPS+@+
} T_hV%
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private void mergeSort(int[] data, int[] temp, int l, int r) { Z5)eREi=
int i, j, k; R 1zC.m
int mid = (l + r) / 2; 7>.OVh<
if (l == r) ! q6hC
return; `lCuU~~ag
if ((mid - l) >= THRESHOLD) I0w%8bs
mergeSort(data, temp, l, mid); Gp2!xKgm
else lgD]{\O$ip
insertSort(data, l, mid - l + 1); 8I#D`yVKc
if ((r - mid) > THRESHOLD) +<(a}6dt
mergeSort(data, temp, mid + 1, r); &^QPkX@p
else AlX3Wv}
insertSort(data, mid + 1, r - mid); :=!Mh}i
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for (i = l; i <= mid; i++) { /^<en(0=P
temp = data; !D:k!
} F@SG((`
for (j = 1; j <= r - mid; j++) { *@M3p}',M
temp[r - j + 1] = data[j + mid]; %J P!{mqj
} Da,Tav%b
int a = temp[l]; "kSwa16O
int b = temp[r]; d<T%`:s<
for (i = l, j = r, k = l; k <= r; k++) { _/x&<,3
if (a < b) { 9M2f!kJP$
data[k] = temp[i++]; v*TeTA
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a = temp; G}Z4g
} else { h_ ZX/k
data[k] = temp[j--]; ;h=S7M9.
b = temp[j]; PdE>@0X?M
} 7'j9rmTXs
} !#}>Hv^N
} ;93KG4a
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/** RaNeZhF>M
* @param data [MmM 9J["
* @param l g9V.13k
* @param i 5'
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*/ Y3oMh,
private void insertSort(int[] data, int start, int len) { n<R \w''x
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); *\q8BZ
} rg)h5G
} AzjMv6N
} e- 6(F4
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}