归并排序: ,lUr[xzV
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package org.rut.util.algorithm.support; F4$N:Jkl
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import org.rut.util.algorithm.SortUtil; XkE'k;AEx
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/** 2,bLEhu
* @author treeroot 6O9?":3;
* @since 2006-2-2 !^m,v19Ds<
* @version 1.0 S(MVL!Lm
*/ x}(p\Efx
public class MergeSort implements SortUtil.Sort{ 1 ^q~NYTK
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/* (non-Javadoc) KH_~DZU*5
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ,{rm<M.)
*/ stcbM
public void sort(int[] data) { d|Q_Z@;JF
int[] temp=new int[data.length]; 530Z>q
mergeSort(data,temp,0,data.length-1); !W?6,i -]
} =bDy :yY}
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private void mergeSort(int[] data,int[] temp,int l,int r){ Th%2pwvER
int mid=(l+r)/2; kntM
if(l==r) return ; 8O='Q-&8
mergeSort(data,temp,l,mid); %g+*.8;"b
mergeSort(data,temp,mid+1,r); F `cuV
for(int i=l;i<=r;i++){ rM5{R}+;
temp=data; /_g-w93
} pipO,n
int i1=l; ;wF 0s
int i2=mid+1; Q
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for(int cur=l;cur<=r;cur++){ J~,Ny_L
if(i1==mid+1) *~H\#N|x
data[cur]=temp[i2++]; W2 p&LP
else if(i2>r) ,4`=gKn
data[cur]=temp[i1++]; IJz=SV
else if(temp[i1] data[cur]=temp[i1++]; }_[Bp
else [l%6wIP&{
data[cur]=temp[i2++]; //W7$DYEG
} 1GA$nFBVC
} F9\T<
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} ,rZp(moj
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改进后的归并排序: o1B8_$aYgc
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package org.rut.util.algorithm.support; vD@=V#T
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import org.rut.util.algorithm.SortUtil; D<SLv,Y
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/** Q`* v|Lp
* @author treeroot =FfxHo1k
* @since 2006-2-2 *W&}}iL
* @version 1.0 t7].33%\
*/ Aq~}<qkIF+
public class ImprovedMergeSort implements SortUtil.Sort { /6@~XO)w
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private static final int THRESHOLD = 10; /CW
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/* {@tqeu%IM
* (non-Javadoc) @UgZZ
* )!tqock*v
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) G+dQ" cI9
*/ |MEu"pY)
public void sort(int[] data) { g E#4 3
int[] temp=new int[data.length]; Sh(W s2b7
mergeSort(data,temp,0,data.length-1); 'L1=:g.\i
} tITx+i
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private void mergeSort(int[] data, int[] temp, int l, int r) { yR|Beno
int i, j, k; Mb0l*'ZF
int mid = (l + r) / 2; YrRD3P.P
if (l == r) 7F!(60xY
return; =mWr8p-H
if ((mid - l) >= THRESHOLD) 40ZHDtIu<
mergeSort(data, temp, l, mid); QhqXd
else V% PeZ.Xv
insertSort(data, l, mid - l + 1); dd{pF\a
if ((r - mid) > THRESHOLD) oI2YJ2?Je8
mergeSort(data, temp, mid + 1, r); 5OS|Vp||b
else xQ{n|)i>
insertSort(data, mid + 1, r - mid); "?r=n@Kv
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for (i = l; i <= mid; i++) { ,-[e{=Cz
temp = data; dH8^\s .F
} '1u!@=.\G
for (j = 1; j <= r - mid; j++) { ZA>p~Zt
temp[r - j + 1] = data[j + mid]; Yc]
} (}jYi*B
int a = temp[l]; ,dZ&i!@?
int b = temp[r]; S="teH[
for (i = l, j = r, k = l; k <= r; k++) { Vy6A]U\%
if (a < b) { <.6bni
)
data[k] = temp[i++]; 6&Al9+$
a = temp; =:~%$5[[
} else { %n7mN])
data[k] = temp[j--]; )08mG_&atL
b = temp[j]; bU+
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} 1_Ag:>#X
} Z6Kw'3
} C~PoC'"q
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/** {y0 `p1
* @param data s1/:Ts[3i
* @param l t^Hte^#S
* @param i V/; / &
*/ SA1|7
private void insertSort(int[] data, int start, int len) { pl.D
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for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); cI
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} q)Uh_l.Cj
} =%UX"K`
} `_*NFv1_
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}