归并排序: 37q@rDm2
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package org.rut.util.algorithm.support; r,]#b[:.s|
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import org.rut.util.algorithm.SortUtil; Y9=(zOqv
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/** `$YP<CJeq
* @author treeroot jr /lk
* @since 2006-2-2 $v`afd y
* @version 1.0 _oB_YL;,*
*/ ';G1A
public class MergeSort implements SortUtil.Sort{ zi'Jr)n
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/* (non-Javadoc) $x#FgD(iI
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) D&ve15wL
*/ /oL;YIoQX
public void sort(int[] data) { /R
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int[] temp=new int[data.length]; NJ MJ
mergeSort(data,temp,0,data.length-1); ]O`
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} {&[9iIf
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private void mergeSort(int[] data,int[] temp,int l,int r){ LrCk*@
int mid=(l+r)/2; '&FjW-`"
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if(l==r) return ; 7Mx6
mergeSort(data,temp,l,mid); @[6,6:h|
mergeSort(data,temp,mid+1,r); ,zQOZ'^
for(int i=l;i<=r;i++){ aZk&`Jpz
temp=data; y#<MVH
} H2r8,|XL
int i1=l; @-)tM.8~
int i2=mid+1; DOQc"+
for(int cur=l;cur<=r;cur++){ !>(RK"KWq]
if(i1==mid+1) OI0B:()
data[cur]=temp[i2++]; @+Y8*Rj\3
else if(i2>r) =9G;PVk|
data[cur]=temp[i1++]; -.<k~71
else if(temp[i1] data[cur]=temp[i1++]; f&x0@Q/eON
else T}D<Sc
data[cur]=temp[i2++]; t0#[#I1+
} 8seBT;S
} WV"jH9"[
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} )B!d,HKt;
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改进后的归并排序: Zw]
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package org.rut.util.algorithm.support; =6=_/q2
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import org.rut.util.algorithm.SortUtil; <8#ObdY!
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/** [`Cq\mI-W
* @author treeroot up%Z$"Y
* @since 2006-2-2 l+y}4k=/
* @version 1.0 Hwm?#6\5
*/ jko"MfJ
public class ImprovedMergeSort implements SortUtil.Sort { p{=QGrxB*
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private static final int THRESHOLD = 10; M]HgIL@9#
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/* &,i~ cG?
* (non-Javadoc) oh#>
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* 3,);0@I
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 7W9~1
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*/ IC{F.2D
public void sort(int[] data) { G_ Ay
int[] temp=new int[data.length]; m=b~i^@
mergeSort(data,temp,0,data.length-1); o0pT6N)
} WA)Ij(M8 p
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private void mergeSort(int[] data, int[] temp, int l, int r) { !]S=z^"<
int i, j, k; -qe bQv
int mid = (l + r) / 2; l
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if (l == r) l9/:FiJ_
return; 137Xl>nO
if ((mid - l) >= THRESHOLD) (\dK4JJ
mergeSort(data, temp, l, mid); 2D([Z -<i
else BN@,/m9OQ%
insertSort(data, l, mid - l + 1); mEQ!-p
if ((r - mid) > THRESHOLD) ?A7Yk4Y.?N
mergeSort(data, temp, mid + 1, r); c[0oh.
else -)<mS
insertSort(data, mid + 1, r - mid); 2 Y|D'^
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for (i = l; i <= mid; i++) { :+,st&(E
temp = data; WA
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} vN{-?
for (j = 1; j <= r - mid; j++) { C%ytkzG_
temp[r - j + 1] = data[j + mid]; 5@XV6
} S;A)C`X&
int a = temp[l]; mjEs5XCC"
int b = temp[r]; vv
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for (i = l, j = r, k = l; k <= r; k++) { hteOh#0{
if (a < b) { &-GuKH(Y<
data[k] = temp[i++]; 2W3W/> 2h
a = temp; B;-2$
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} else { [U_[</L7
data[k] = temp[j--]; 4w{-'M.B
b = temp[j]; R I@*O6\/I
} H_X?dj15
} Dw |3Z
} \]Z&P,}w
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/** hXX1<~k
* @param data 64D%_8#m
* @param l NygI67
* @param i >IR$e=5$
*/ vS M_]fn
private void insertSort(int[] data, int start, int len) { fQQ|gwVki
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); e`sw*m5
} }f}IA\8]
} m{&w{3pQk
} '; /84j-3F
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}