归并排序: <x53b/ft
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package org.rut.util.algorithm.support; M(jSv
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import org.rut.util.algorithm.SortUtil; bmGIxBRq
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/** QZYD;&iY&
* @author treeroot Nd%,V
* @since 2006-2-2 >
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* @version 1.0 :-69,e
*/ 9]xOuCb
public class MergeSort implements SortUtil.Sort{ tF
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/* (non-Javadoc) ![0\m2~iv
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) OLXG0@
*/ ,1a6u3f,
public void sort(int[] data) { 18zv]v
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int[] temp=new int[data.length]; 1I<fp $h
mergeSort(data,temp,0,data.length-1); u?&P6|J&
} S)>L 0^M1
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private void mergeSort(int[] data,int[] temp,int l,int r){ [K9l>O
int mid=(l+r)/2; p>Qzz`@e
if(l==r) return ; -V%"i,t
mergeSort(data,temp,l,mid); 4`7N}$j#,
mergeSort(data,temp,mid+1,r); dNU i|IYm$
for(int i=l;i<=r;i++){ p?>(y
temp=data; }} J?, >g
} bd5\Rt
int i1=l; pi7W8y
int i2=mid+1; :uSo2d
for(int cur=l;cur<=r;cur++){ Uz} #.
if(i1==mid+1) AU OL?st
data[cur]=temp[i2++]; AD_")_B|i
else if(i2>r) zN:VT&
data[cur]=temp[i1++]; bzF>Efza
else if(temp[i1] data[cur]=temp[i1++]; -B* = V
else cGIxE[n'
data[cur]=temp[i2++]; @4#q
} J NPEyC
} onI%Jl sq
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} ; $i{>mDT
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改进后的归并排序: '=Nb`n3%
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package org.rut.util.algorithm.support; V|13%aE_v
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import org.rut.util.algorithm.SortUtil; - 0R5g3^*/
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/** ; :4&nJ*qG
* @author treeroot NTbmI$(
* @since 2006-2-2 ]bLI!2Kr
* @version 1.0 u!hY
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*/ gFizw:l
public class ImprovedMergeSort implements SortUtil.Sort { GL-v</2'U
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private static final int THRESHOLD = 10; HkVnTC
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/* o$;t
* (non-Javadoc) #^4p(eZ[}
* _kg<KD=P
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) SR!EQ<
*/ _2xNio&
public void sort(int[] data) { -K eoq
int[] temp=new int[data.length]; z6)b XL[f
mergeSort(data,temp,0,data.length-1); *:gx1wd
} t~]n"zgovz
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private void mergeSort(int[] data, int[] temp, int l, int r) { `u$
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int i, j, k; H=RzY-\a%
int mid = (l + r) / 2; LeRyS]
if (l == r) 3`.*~qW
return; 3qujz)o
if ((mid - l) >= THRESHOLD) hjf!FY*F
mergeSort(data, temp, l, mid); DA]<30w
else &W+lwEu
insertSort(data, l, mid - l + 1); ;)$bhNFHx
if ((r - mid) > THRESHOLD) o&0fvCpW
mergeSort(data, temp, mid + 1, r); ;-sZaU;
else FjR/_GPo6
insertSort(data, mid + 1, r - mid); E6JfSH#
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for (i = l; i <= mid; i++) { #{K}o}
temp = data; 0)F.Y,L
} Z.'j7(tu
for (j = 1; j <= r - mid; j++) { QOiPDu=8z
temp[r - j + 1] = data[j + mid]; v=5H,4UMA
} HVjN<H IqM
int a = temp[l]; Pt5"q3ec{T
int b = temp[r]; A0X'|4I
for (i = l, j = r, k = l; k <= r; k++) { mh#NmW>n
if (a < b) { mv] .
data[k] = temp[i++]; 4PK/8^@7)>
a = temp; uDD{O~wF,
} else { f#mNx
data[k] = temp[j--]; xB-\yWDZe
b = temp[j]; 3E9 )~$
} yX9 .yq
} E{s p
} $ix:S$
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/** bUvVt3cm
* @param data Z5/*iun
* @param l X1*f#3cm#
* @param i :m.6a4vx
*/ )R6h
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private void insertSort(int[] data, int start, int len) { b'q ru~i
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); X* 4C?v
} I+2#k\y
}
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} $40G$w
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}