归并排序: Vy*:ne
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package org.rut.util.algorithm.support; }@Ge}9$h
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import org.rut.util.algorithm.SortUtil; 0@G")L
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/** r`AuvwHPs[
* @author treeroot 6b%WHLUeT
* @since 2006-2-2 ^xh}I5
* @version 1.0 .mDM[e@'
*/ rFaF
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public class MergeSort implements SortUtil.Sort{ 9so6WIWc
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/* (non-Javadoc) zunV<2~(2}
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) B*4}GPQ
*/ x%+aKZ(m)
public void sort(int[] data) { 1QmH{jM
int[] temp=new int[data.length]; T.Ryy"%F
mergeSort(data,temp,0,data.length-1); U>V&-kxtV
} F#5B<I
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private void mergeSort(int[] data,int[] temp,int l,int r){ c6nflk.l
int mid=(l+r)/2; A,\6nO67
if(l==r) return ; k$H%.l;E
mergeSort(data,temp,l,mid); '~ ,p[
mergeSort(data,temp,mid+1,r); %^I88,$&L
for(int i=l;i<=r;i++){ ]l'Y'z,}
temp=data; cgl*t+o&
} 6&bY} i^K
int i1=l; /%0<p,T
int i2=mid+1; qHNE8\9
for(int cur=l;cur<=r;cur++){ i/~1F_
if(i1==mid+1) S}$r>[t
data[cur]=temp[i2++]; 9:`(Q3Ei
else if(i2>r) *Ho/ZYj3
data[cur]=temp[i1++]; (T!9SU
else if(temp[i1] data[cur]=temp[i1++]; .C2TQ:B, .
else kGd<5vCs
data[cur]=temp[i2++]; iXjo[Rz^C
} OfctoPP _0
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} ([-|}
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改进后的归并排序: deM7fN4lTi
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package org.rut.util.algorithm.support; " R-!(9k^`
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import org.rut.util.algorithm.SortUtil; TjHwjRa
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/** ZQ_xDKqRV
* @author treeroot H^.IY_I`U*
* @since 2006-2-2 9G{;?c
* @version 1.0 Pu"R,a
*/ K4]g[z
public class ImprovedMergeSort implements SortUtil.Sort { rS4@1`/R
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private static final int THRESHOLD = 10; AC;V
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/* VQ0fS!5'
* (non-Javadoc) +hE(Ra#
* hSFn8mpXT
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ax{ ;:fW
*/ Y$Q|J4z
public void sort(int[] data) { RRGWC$>?
int[] temp=new int[data.length]; W?eu!wL#p
mergeSort(data,temp,0,data.length-1); Ee@4 %/v
} F
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private void mergeSort(int[] data, int[] temp, int l, int r) { _R.B[\r@
int i, j, k; $<^u^q37u
int mid = (l + r) / 2; "Kc>dJ@W
if (l == r) ]S(%[|
return; GrTulN?
if ((mid - l) >= THRESHOLD) `)T~psT
mergeSort(data, temp, l, mid); es>W$QKlo
else em\ 9'L^
insertSort(data, l, mid - l + 1); Ea?XT&,
if ((r - mid) > THRESHOLD) ;zYqsS
mergeSort(data, temp, mid + 1, r); a)S+8uU
else ]~6_ WE8L
insertSort(data, mid + 1, r - mid); DK=cVpN%s
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for (i = l; i <= mid; i++) { &Ch#-CUE/
temp = data; T"&)&"W*U
} FL8g5I
for (j = 1; j <= r - mid; j++) { - !>}_AH
temp[r - j + 1] = data[j + mid]; ?{U
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int a = temp[l]; Gg~QAsks
int b = temp[r]; ^-rfvc
for (i = l, j = r, k = l; k <= r; k++) { N.4q.
if (a < b) { 549jWG
data[k] = temp[i++]; #fJ] o_
a = temp; mk3_
} else { /;tPNp{!dw
data[k] = temp[j--]; wWSdTLX
b = temp[j]; K{ \;2M
} `E!N9qI?t$
} "Vr[4&`
} 7lS#f1E
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/** {@<J_A
* @param data &f7fK|}
* @param l V\})3i8
* @param i "dROb}szn
*/
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private void insertSort(int[] data, int start, int len) { @^;j)%F}
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); N? 5x9duK
} =7m}yDs6$
} sTOa
} Qb!PRCHQ
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}