归并排序: [+j39d.Q
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package org.rut.util.algorithm.support; Ku
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import org.rut.util.algorithm.SortUtil; ^KK9T5H
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/** HDTdOG)
* @author treeroot g;M\4o
* @since 2006-2-2 *`(/wE2v]
* @version 1.0 A\6Q*VhK
*/ $1(FN+ Mb
public class MergeSort implements SortUtil.Sort{ wd=xs7Dz<p
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/* (non-Javadoc) /nX+*L}d/
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) |>Xw"]b;
*/ TYs#v/)I
public void sort(int[] data) { .x^`y2'U
int[] temp=new int[data.length]; %5zztReI
mergeSort(data,temp,0,data.length-1); 9gz"r
} qtv>`:neB
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private void mergeSort(int[] data,int[] temp,int l,int r){ /G>reG,G
int mid=(l+r)/2; j5cc"s
if(l==r) return ; _`Abz2s
mergeSort(data,temp,l,mid); ^edg@fp
mergeSort(data,temp,mid+1,r); BhMHT:m
for(int i=l;i<=r;i++){
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temp=data; gw1|
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} fC$~3v
int i1=l; 4cO||OsMU
int i2=mid+1; (\^)@Y
for(int cur=l;cur<=r;cur++){ Gn
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if(i1==mid+1) fGv`.T _d
data[cur]=temp[i2++]; F[
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else if(i2>r) P'nbyF
data[cur]=temp[i1++]; 9t$%Tc#Z
else if(temp[i1] data[cur]=temp[i1++]; =&-hU|ur
else [SW@ "C!
data[cur]=temp[i2++]; ,u,]ab
} $LPu_FJ
} MI!JZI$z5
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改进后的归并排序: 6$'6x2,
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package org.rut.util.algorithm.support; OGy/8B2c
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import org.rut.util.algorithm.SortUtil; N ".-]bB
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/** ]Mh7;&<6[
* @author treeroot SZ9xj^"g
* @since 2006-2-2 =f)S=0U F
* @version 1.0 VesO/xG<
*/ Z{ntF
public class ImprovedMergeSort implements SortUtil.Sort { 5T[9|zJs
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private static final int THRESHOLD = 10; i*9[El
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/* mne^PSI:
* (non-Javadoc) ?-F SDNQ
* ]`D(/l'
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) |wf:|%
*/ zS:89y<
public void sort(int[] data) { F:/R'0
int[] temp=new int[data.length]; 5JbPB!5;
mergeSort(data,temp,0,data.length-1); 'DQp
} t[6 g9 e$
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private void mergeSort(int[] data, int[] temp, int l, int r) { Sa&~\!0t
int i, j, k;
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int mid = (l + r) / 2; qj71
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if (l == r) cJ&e^$:Er
return; Ii?"`d +JA
if ((mid - l) >= THRESHOLD) .P=uR8
mergeSort(data, temp, l, mid); ou44vKzS
else Z_qs_/y
insertSort(data, l, mid - l + 1); A
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if ((r - mid) > THRESHOLD) r +]
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mergeSort(data, temp, mid + 1, r); Z`xz |:D+
else PL8{|Q
insertSort(data, mid + 1, r - mid); ~'WvIA
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for (i = l; i <= mid; i++) { DytOS}/^9
temp = data; LnJ/t(KV
} =+{.I,g}g@
for (j = 1; j <= r - mid; j++) { B{ NKDkDH
temp[r - j + 1] = data[j + mid]; FhB^E$r%
} ]xfAdBi
int a = temp[l]; s,^?|Eo;0
int b = temp[r]; !oU$(,#9
for (i = l, j = r, k = l; k <= r; k++) { SaEe7eHd
if (a < b) { 's$pr#V
data[k] = temp[i++]; OwP9=9};
a = temp; L%a ni}V
} else { k@5,6s:
data[k] = temp[j--]; NDB ]8C
b = temp[j]; z9$x9u
} VEd#LSh
} O0"i>}g4
} a4,bP*H
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/** qy@gW@IU
* @param data [E(DGt
* @param l
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* @param i 1!\!3xa V
*/ yXNE2K
private void insertSort(int[] data, int start, int len) { pFSVSSQRV|
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); <Ebkb3_
} r2.87
} v,RLN`CID
} 2 c'=^0:
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}