归并排序: }B2qtb3
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package org.rut.util.algorithm.support; 3Uni{Z]Q)
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import org.rut.util.algorithm.SortUtil; |%5nV=&\
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/** :faB7wduW;
* @author treeroot -LEpT$v|
* @since 2006-2-2 5gY9D!;:0D
* @version 1.0 <^wqN!/
*/ &!O~ f
public class MergeSort implements SortUtil.Sort{ !7aJfs2
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/* (non-Javadoc) ;>B06v
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 3dC;B@
*/ k^r-~q+NV#
public void sort(int[] data) { KVCj06}j
int[] temp=new int[data.length]; gD/% l[
mergeSort(data,temp,0,data.length-1); 6O'6,%#
} cY[qX/0~
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private void mergeSort(int[] data,int[] temp,int l,int r){ :*s+X$x,<
int mid=(l+r)/2; kK$*,]iCp
if(l==r) return ; y,=TB[d#
mergeSort(data,temp,l,mid); *p7_rY
mergeSort(data,temp,mid+1,r); \x+ "1
for(int i=l;i<=r;i++){ ajALca4
temp=data; {A MoE+U
} M]M(E) *5
int i1=l; wT-@v,$
int i2=mid+1; rgXD>yu(
for(int cur=l;cur<=r;cur++){ K^+}__;]
if(i1==mid+1) q.NvwJ
data[cur]=temp[i2++]; ,N`D{H"F
else if(i2>r) M[,G#GO
data[cur]=temp[i1++]; z+6%Ya&ls
else if(temp[i1] data[cur]=temp[i1++]; DU1\ K
else Gu@Znh-D
data[cur]=temp[i2++]; bdkxCt
} 1PjqXgN5p
} Blnc y
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改进后的归并排序: keL!;q|r-)
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package org.rut.util.algorithm.support; .q9wyVi7GI
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import org.rut.util.algorithm.SortUtil; YR}By;Bq
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/** ##clReS
* @author treeroot XbKNH>
* @since 2006-2-2 [u}2xsSx
* @version 1.0 &%`Y>\@f
*/ /f)
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public class ImprovedMergeSort implements SortUtil.Sort { It3.
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private static final int THRESHOLD = 10; <<.%Gk
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/* [*AWCV
* (non-Javadoc) u#`FkuE\}
* bjYaJtn
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) #Do#e
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*/ uw`fC%-xh
public void sort(int[] data) { 26<Wg7/,
int[] temp=new int[data.length]; W;@9x1jKX
mergeSort(data,temp,0,data.length-1); k=):>}
} ?sm@lDZ\
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private void mergeSort(int[] data, int[] temp, int l, int r) { p7kH"j{xD
int i, j, k; yCOIv!/zy
int mid = (l + r) / 2; s;4r)9Uvx
if (l == r) Yl$Cj>FG
return; Du."O]syD
if ((mid - l) >= THRESHOLD) t?:Q
mergeSort(data, temp, l, mid); V_-{TGKX
else $(U}#[Vie
insertSort(data, l, mid - l + 1); h1 (MvEt
if ((r - mid) > THRESHOLD) #-Ad0/
mergeSort(data, temp, mid + 1, r); 8QNd t
else 9 ?~Y
insertSort(data, mid + 1, r - mid); iu(+
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for (i = l; i <= mid; i++) { {-?8r>
temp = data; &\/b(|>
} 8x9$6HO
for (j = 1; j <= r - mid; j++) { {IpIQ-@l
temp[r - j + 1] = data[j + mid]; e=%6\&q
} lYMNx|PF
int a = temp[l]; }./_fFN@
int b = temp[r];
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for (i = l, j = r, k = l; k <= r; k++) { 2?bE2^6
if (a < b) { +|=5zWI/
data[k] = temp[i++]; 7yK1Q_XY>
a = temp; 8${Yu
} else { eX@7f!uz
data[k] = temp[j--]; J\ V.J/
b = temp[j]; mv+K!T6
} J$Qm:DC5
} [M{EO)
} 3!V$fl0
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/** b-XC\
* @param data wuQ>|\Zs
* @param l XgmblNp1
* @param i N2x!RYW
*/ GXE6=BO
private void insertSort(int[] data, int start, int len) { {k}EWV
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); ;y{VdT
} J|BZ{T}d
} sUP!'Av
} @~l?hf
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}