归并排序: k,~I>qg
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package org.rut.util.algorithm.support; O3?3XB> <
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import org.rut.util.algorithm.SortUtil; 9^;)~ G
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/** ),G?f {`!
* @author treeroot 5pOb;ry")`
* @since 2006-2-2 q,ry3Nr4n
* @version 1.0 k63]Qf=5?N
*/ +w(sDH~kd
public class MergeSort implements SortUtil.Sort{ jLANv{"
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/* (non-Javadoc) P4M*vZq)
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 3$.R=MQ7
*/ }mz6z<pJ_
public void sort(int[] data) { our$Ka31
int[] temp=new int[data.length]; ~f.fg@v`+v
mergeSort(data,temp,0,data.length-1); Y7|R vLWoP
} i; 8""A
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private void mergeSort(int[] data,int[] temp,int l,int r){ Ca SoR |
int mid=(l+r)/2; Ya#,\;dTT
if(l==r) return ; b'D|p/)m0S
mergeSort(data,temp,l,mid); &a'H vQV
mergeSort(data,temp,mid+1,r); (&25 8i,
for(int i=l;i<=r;i++){ {^r8uKo:~
temp=data; q8 j
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} *PXlbb
int i1=l; )FNvtLZ
int i2=mid+1; '7+e!>"
for(int cur=l;cur<=r;cur++){ y>:-6)pv
if(i1==mid+1) j89C~xP6
data[cur]=temp[i2++]; i\2d1Z
else if(i2>r) J 8/]&Ow
data[cur]=temp[i1++]; #cN0ciCT'
else if(temp[i1] data[cur]=temp[i1++]; 7e{w)m:A
else 5hVp2w-
data[cur]=temp[i2++]; ,a:!"Z^f
} 'T(7EL3$}
} *5SOXrvhu6
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} [d(@lbV0
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改进后的归并排序: U_/sY9gz(
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package org.rut.util.algorithm.support; UDJ{iZ
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import org.rut.util.algorithm.SortUtil; 6ty>0
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/** oKl^Ttr
* @author treeroot TRQ@=.
* @since 2006-2-2 MwoU>+XB
* @version 1.0 QB<9Be@e
*/ 3GH@|id
public class ImprovedMergeSort implements SortUtil.Sort { wVI 1sR
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private static final int THRESHOLD = 10; mSn>
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/* "bO\Wt#Mf
* (non-Javadoc) y^7ol;t
* {Vc%g a|E
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) C%s+o0b
*/ uF xrv
public void sort(int[] data) {
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int[] temp=new int[data.length]; /H_,1Fu|
mergeSort(data,temp,0,data.length-1); ~16QdwK
} kC=e>v
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private void mergeSort(int[] data, int[] temp, int l, int r) { < ag|#
int i, j, k; M;BDo(1
int mid = (l + r) / 2; 9uV'#sR
if (l == r) 'baew8Q#
return; WaU+ZgDrG
if ((mid - l) >= THRESHOLD) W`baD!*
mergeSort(data, temp, l, mid); &kR +7
else taS2b#6\+
insertSort(data, l, mid - l + 1); BPp`r_m8w}
if ((r - mid) > THRESHOLD) W/(D"[:l%
mergeSort(data, temp, mid + 1, r); 3Un{Q~6h
else [dm&I#m=
insertSort(data, mid + 1, r - mid); <kQ
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for (i = l; i <= mid; i++) { #cG7h(!
temp = data; XcoV27
} mv7><C
for (j = 1; j <= r - mid; j++) { OnNWci|7
temp[r - j + 1] = data[j + mid]; #~A (%a
} m).S0
int a = temp[l]; QvM+]pdR6
int b = temp[r]; k z|2PP
for (i = l, j = r, k = l; k <= r; k++) { 8p4J7 -
if (a < b) { <a)B5B>
data[k] = temp[i++]; Eei"baw/
a = temp; . ZuRH_pI
} else { r(ej=aR
data[k] = temp[j--]; )E--E+j
b = temp[j]; #) eI]
} 8]@)0q {r
} [>5<&[A
} #;9I3,@/Y
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/** ^[K3]*!@
* @param data r-M:YB
* @param l +.Pv:7gh
* @param i {Y>5 [gp
*/ /.Yf&2X\
private void insertSort(int[] data, int start, int len) { yN9k-IPI
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); #fq%903=
} ?hpT"N,hF9
} \#LkzN8
} yc4?'k!
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}