归并排序: Ty{
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package org.rut.util.algorithm.support; Ieq_XF]U
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import org.rut.util.algorithm.SortUtil; z{1A x
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/** OwNM`xSa|\
* @author treeroot viYrPhH+z
* @since 2006-2-2 YfT
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* @version 1.0 FT6C KsM"
*/ b~tu;:
public class MergeSort implements SortUtil.Sort{ qfCZ
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/* (non-Javadoc) )ADI[+KW
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) j?o6>j
*/ W>+`e]z
public void sort(int[] data) { RiR],Sj
int[] temp=new int[data.length]; x!s=Nola
mergeSort(data,temp,0,data.length-1); K7JZUS`C!
} pl@K"PRE
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private void mergeSort(int[] data,int[] temp,int l,int r){ %$ o[,13=
int mid=(l+r)/2; -:=m-3*Tg
if(l==r) return ; Gq[5H(0/c
mergeSort(data,temp,l,mid); !'#
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mergeSort(data,temp,mid+1,r); _qf~
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for(int i=l;i<=r;i++){ `0U\|I#
temp=data; WO%pX+PoH
} F?a
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int i1=l; "pK<d~Wu
int i2=mid+1; 2Uf/'
for(int cur=l;cur<=r;cur++){ %?+Lkj&
if(i1==mid+1) !a\v)R
data[cur]=temp[i2++]; zTMLE~w
else if(i2>r) T&6>Eb0{
data[cur]=temp[i1++]; .Y7Kd+)s)L
else if(temp[i1] data[cur]=temp[i1++]; X0j> g^b8
else W(ryL_#;
data[cur]=temp[i2++]; fNx!'{o"
} ~V ?z!3r-)
} @ls/3`E/5E
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}
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改进后的归并排序: v36Z*I6)5
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package org.rut.util.algorithm.support; V+lS\E.
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import org.rut.util.algorithm.SortUtil; o58c!44
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/** +$>aT(q
* @author treeroot
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* @since 2006-2-2 g.62XZF@
* @version 1.0 qk^/&j
*/ |/xA5_-N
public class ImprovedMergeSort implements SortUtil.Sort { ~};q/-[r
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private static final int THRESHOLD = 10; {0,6-dd5
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/* oBub]<.J
* (non-Javadoc) [x,
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* -:r<sv$
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 0>-}c>
*/ Ex]Ku
public void sort(int[] data) { xuqG)HthRS
int[] temp=new int[data.length]; 4/*@cW
mergeSort(data,temp,0,data.length-1); |%XcI3@*
} }JQy&V%
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private void mergeSort(int[] data, int[] temp, int l, int r) { ~-H3]
int i, j, k; ?771e:>S-
int mid = (l + r) / 2; m0.g}N-w
if (l == r) }zkFl{/u
return; `mD!z.`U
if ((mid - l) >= THRESHOLD) :,qvqh][
mergeSort(data, temp, l, mid); pd,d"+
else =Sr<d|\O
insertSort(data, l, mid - l + 1); ]FvGAG.*
if ((r - mid) > THRESHOLD) #>G:6'r
mergeSort(data, temp, mid + 1, r); /!>OWh*~
else 4IY|<
insertSort(data, mid + 1, r - mid); 6; )5v
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for (i = l; i <= mid; i++) { $f+I#uJ
temp = data; +zDRed_]=_
} zHNBX
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for (j = 1; j <= r - mid; j++) { DS@Yto
temp[r - j + 1] = data[j + mid]; RTg\c[=w
} "|&3z/AUh
int a = temp[l]; oXk6,b"
int b = temp[r]; jvR(e"
for (i = l, j = r, k = l; k <= r; k++) { v/~&n
if (a < b) { 8[AU`F8W
data[k] = temp[i++]; An?#B4:
a = temp; S"^'ksL\
} else { jd5kkX8=
data[k] = temp[j--];
}#&[[}@th
b = temp[j]; E&t8nlTx
} Fx1FxwIJ
} E^{!B]/oP
} *+6iXMwe
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/** >y#qn9rV1
* @param data csJ)Pt?d
* @param l ~W4SFp
* @param i c,)]!{c
*/ 2$t%2>1>@
private void insertSort(int[] data, int start, int len) { Gi@c`lRd1
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); pNQ7uy
} |Go$z3bx
} aTH$+f1?Q
} [%6)
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}