归并排序: BGj!/E
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package org.rut.util.algorithm.support; U<sGj~"#
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import org.rut.util.algorithm.SortUtil; O9?.J,,mVh
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/** e&T-GL
* @author treeroot 3ww\Z8UeK
* @since 2006-2-2 73'A Q")UJ
* @version 1.0 @uV]7d"z(
*/ M1NdlAAf
public class MergeSort implements SortUtil.Sort{ 6[R6P:v&'G
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/* (non-Javadoc) 3`{
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) J|
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*/ FF^h(Ea
public void sort(int[] data) { 1Vz^?t:
int[] temp=new int[data.length]; XMZ$AeF@
mergeSort(data,temp,0,data.length-1); ,66(*\xT
} VR1]CN"G
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private void mergeSort(int[] data,int[] temp,int l,int r){ a;IOL
int mid=(l+r)/2; NV(jp'i~
if(l==r) return ; t$t'{*t(
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mergeSort(data,temp,l,mid); SKNHLE}
mergeSort(data,temp,mid+1,r); Rsq EAdZw[
for(int i=l;i<=r;i++){ kjsj~jwvv
temp=data; F[jqJzCz
} k1yqerA
int i1=l; IOC$jab@
int i2=mid+1; .L%pWRxA[
for(int cur=l;cur<=r;cur++){ ,38M6yD
if(i1==mid+1) 3$P
data[cur]=temp[i2++]; acUyz2x
else if(i2>r) "m6G;cv
data[cur]=temp[i1++]; -
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else if(temp[i1] data[cur]=temp[i1++]; *6AqRE
else L..
data[cur]=temp[i2++]; <Dgf'GrJ
} gq*W 0S
} T@P~A)>yo
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改进后的归并排序: qj:[NPwaM
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package org.rut.util.algorithm.support; ju;OQC~[L]
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import org.rut.util.algorithm.SortUtil; XA>uCJf
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/** *Od?>z
* @author treeroot f9Xa}*
* @since 2006-2-2 . bUmT !
* @version 1.0 ~fL`aU&
*/ z!b:|*m]w
public class ImprovedMergeSort implements SortUtil.Sort { bk=;=K
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private static final int THRESHOLD = 10; Y$Rte.?
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/* 5$>buYF
* (non-Javadoc) I
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* *>[q*SF
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Z<AZO ^
*/ bYem0hzOe
public void sort(int[] data) { <Pe'&u
int[] temp=new int[data.length]; #"TYk@whWf
mergeSort(data,temp,0,data.length-1); jZmL7
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} />:$"+gKo
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private void mergeSort(int[] data, int[] temp, int l, int r) { _PC<Td>nm
int i, j, k; $}S0LZ_H
int mid = (l + r) / 2; `S?_=JIX
if (l == r) J~`!@!
return; 3rN}iSF^
if ((mid - l) >= THRESHOLD) D_ej%QtB@
mergeSort(data, temp, l, mid); )`Qr=DIsW
else /GJL&RMx
insertSort(data, l, mid - l + 1); p(4B"[ !S
if ((r - mid) > THRESHOLD) `<T4En
mergeSort(data, temp, mid + 1, r); doX`NbA
else C-,#t5eir
insertSort(data, mid + 1, r - mid); tp!eF"v=
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for (i = l; i <= mid; i++) { RHvKWt
temp = data; #7:ah
} ER&\2,fZ
for (j = 1; j <= r - mid; j++) { Ji=`XsV
temp[r - j + 1] = data[j + mid]; mrKIiaU<J
} ${ DSH
int a = temp[l]; k'e1ZAn
int b = temp[r]; ]0(ZlpT
for (i = l, j = r, k = l; k <= r; k++) { N^F5J
if (a < b) { m@D :t5
data[k] = temp[i++]; IvQuxs&a
a = temp; qyy. &+
} else { {A
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data[k] = temp[j--]; -cn`D2RP
b = temp[j]; {H9g&pfv
} xi,fm
} 5BLBcw\;
} 2p 7;v7)y
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/** e iH&<AH
* @param data l`X?C~JhJ
* @param l r~,3
* @param i 9]G~i`QQ
*/ D]'8BS3
private void insertSort(int[] data, int start, int len) { vt(}8C+
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); XS&;8 PO
} u!It';j
} {Ngut
} x|^p9m"=%
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}