归并排序:
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package org.rut.util.algorithm.support; U]rRQ
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import org.rut.util.algorithm.SortUtil; )vlhN2iv
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/** wUJcmM;
* @author treeroot r5^eNg k
* @since 2006-2-2 k+*u/neh
* @version 1.0 x]j W<A
*/ %8v\FS
public class MergeSort implements SortUtil.Sort{ 1< ?4\?j
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/* (non-Javadoc) n+ M <\
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 6ik$B
*/ '~ 47)fN
public void sort(int[] data) { .T`%tJ-Em
int[] temp=new int[data.length]; <1TAw.
mergeSort(data,temp,0,data.length-1); <F'\lA9
} J<lW<:!3]
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private void mergeSort(int[] data,int[] temp,int l,int r){ gjlx~.0d
int mid=(l+r)/2; !5!<C,U
if(l==r) return ; {{!-Gr
mergeSort(data,temp,l,mid);
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mergeSort(data,temp,mid+1,r); Nz-&MS
for(int i=l;i<=r;i++){ );YDtGip J
temp=data; #w=~lq)9
} eyxW 0}[
int i1=l; 2~[juWbz
int i2=mid+1;
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for(int cur=l;cur<=r;cur++){ kq-) ^,{y
if(i1==mid+1) o2ECG`^b
data[cur]=temp[i2++]; B33\?Yj)
else if(i2>r) *m (=V1"
data[cur]=temp[i1++]; nJ;.Td
else if(temp[i1] data[cur]=temp[i1++]; 4<v&S2Yq
else -nwypu
data[cur]=temp[i2++]; qe\5m.k
} $/ ],tSm
} |uJ%5y#
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} ~$J2g
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改进后的归并排序: B)UZ`?>c
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package org.rut.util.algorithm.support; 9-
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import org.rut.util.algorithm.SortUtil; y1#1Ne_
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/** wuo,kM
* @author treeroot q.}CU.dp
* @since 2006-2-2 iURe( [@
* @version 1.0 B-mowmJ3dg
*/ }-2|XD%]
public class ImprovedMergeSort implements SortUtil.Sort { |':{lH6+1
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private static final int THRESHOLD = 10; .RL=xb|[
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/* 9tnD=A<PS
* (non-Javadoc) !n%j)`0M
* D6Wa.,r
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 2&5K.Ui%
*/ H,NF;QPPC
public void sort(int[] data) { &M[?h}B6
int[] temp=new int[data.length]; Alq(QDs
mergeSort(data,temp,0,data.length-1); qxj(p o
} jb)ZLA;L_c
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private void mergeSort(int[] data, int[] temp, int l, int r) { \)Cl%Em
int i, j, k; e}W)LPR!
int mid = (l + r) / 2; phz&zlD
if (l == r) FGkVqZ Y2?
return; |l!aB(NW
if ((mid - l) >= THRESHOLD) 7[wPn`v2
mergeSort(data, temp, l, mid); dF2RH)Ud
else D/' dTrR
insertSort(data, l, mid - l + 1); Qg/rRiV
if ((r - mid) > THRESHOLD) ss-D(K"
mergeSort(data, temp, mid + 1, r); e:W{OIz:
else 6MI8zRX
insertSort(data, mid + 1, r - mid); ," ql5Q4
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for (i = l; i <= mid; i++) { K<J9~
temp = data; DaVa}
} LIrb6g&xj_
for (j = 1; j <= r - mid; j++) { T^q
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temp[r - j + 1] = data[j + mid]; .G\7cZ
} : E?V.
int a = temp[l]; #A.@i+Zv
int b = temp[r]; 54qFfN8O
for (i = l, j = r, k = l; k <= r; k++) { fc@A0Hf
if (a < b) { 13wE"-
data[k] = temp[i++]; 048kPXm`
a = temp; XX~,>Q}H=
} else { M^I(OuRMeI
data[k] = temp[j--]; hv+zGID7
b = temp[j]; ;wD)hNLAvR
} %XTI-B/K
} 2T`!v
} yLcEX
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/** OrG).^l
* @param data [S<";l8
* @param l i6N',&jFU
* @param i S
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*/ .|=\z9_7S8
private void insertSort(int[] data, int start, int len) { E} .^kc[(4
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); .
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} et+0FF
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} w#J2 wS
} A)KZa"EX
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}