归并排序: zv@o-R$l
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package org.rut.util.algorithm.support; r; !us~
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import org.rut.util.algorithm.SortUtil; c2"OpI
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/** s]OXB {M
* @author treeroot 0@;E8^pa
* @since 2006-2-2 IRB;Q(Z
* @version 1.0 `0N/
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*/ Gr?gHAT
public class MergeSort implements SortUtil.Sort{ P6rL;_~e
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/* (non-Javadoc) '#?hm-Ga
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) u"ow?[E
*/ 3kg+*]tLx
public void sort(int[] data) { Uz_{jAhW]
int[] temp=new int[data.length]; L^}kwu#
mergeSort(data,temp,0,data.length-1); wB{-]\H`\
} nor`w,2VF
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private void mergeSort(int[] data,int[] temp,int l,int r){ yMxS'j1
int mid=(l+r)/2; i8F~$6C
if(l==r) return ; lM]7@A
mergeSort(data,temp,l,mid); a*`J]{3G
mergeSort(data,temp,mid+1,r); $[e*0!e
for(int i=l;i<=r;i++){ r@aFB@
temp=data; S7R^%Wck/6
} WObfHAp.
int i1=l; .H"gH-I
int i2=mid+1; V-57BKeDz
for(int cur=l;cur<=r;cur++){ ( ;q$cKy
if(i1==mid+1) 4" @yGXUb
data[cur]=temp[i2++]; '_8Vay~
else if(i2>r) tfsG
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data[cur]=temp[i1++]; Q"\[ICu!,
else if(temp[i1] data[cur]=temp[i1++]; ,}<v:!
else /#HY-b
data[cur]=temp[i2++]; !&X}?NK
} L/shF}<
} +]
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改进后的归并排序: ) ":~`Z*@
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package org.rut.util.algorithm.support; Jyn>:Yq(
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import org.rut.util.algorithm.SortUtil; ='f>p+*c%
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/** uE>}>6)b
* @author treeroot tG6 o^
* @since 2006-2-2 tcs
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* @version 1.0
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*/ A="h}9ok
public class ImprovedMergeSort implements SortUtil.Sort { OLv(
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private static final int THRESHOLD = 10; joa$Y6
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/* aJ2-BRn
* (non-Javadoc) *`\>J.
* ,30&VW##
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) btee;3`
*/ .DT1Jvl
public void sort(int[] data) { PR Y)hb;1
int[] temp=new int[data.length]; 7;Wj ^#
mergeSort(data,temp,0,data.length-1); #<)u%)`
} Ek84yme#
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private void mergeSort(int[] data, int[] temp, int l, int r) { .n"aQ@!
int i, j, k; gB?#T
int mid = (l + r) / 2; .
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if (l == r) sLCL\dWT
return; XI
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if ((mid - l) >= THRESHOLD) ;i1H {hB
mergeSort(data, temp, l, mid); :.@gd7T
else z}Xn>-N-
insertSort(data, l, mid - l + 1); ?g!py[CrE
if ((r - mid) > THRESHOLD) norWNm(n
mergeSort(data, temp, mid + 1, r); W"$'$h
else G|.>p<q
insertSort(data, mid + 1, r - mid); <pz;G}
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for (i = l; i <= mid; i++) { ,Xao{o(
temp = data; CfAX,f"ZP
} m(?M]CH(A
for (j = 1; j <= r - mid; j++) { A|jaWZM-
temp[r - j + 1] = data[j + mid]; .HMO7n6)8l
} ZEp UHdin
int a = temp[l]; ?u"MsnCXYn
int b = temp[r]; 9PIm/10pP^
for (i = l, j = r, k = l; k <= r; k++) { 8NWvi%g
if (a < b) { pl%3RVpoc
data[k] = temp[i++]; x)h5W+$
a = temp; y#o ,Vg*V
} else { I HgYgn
data[k] = temp[j--]; nJNdq`y2
b = temp[j]; Y]Td+Zi
} +2!F6"hP
} Tt<Ry'Z$3
} ](vOH#E
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/** ({87311%
* @param data weYP^>gH'
* @param l G BV]7.
* @param i \E5%.KR
*/ TeSF
private void insertSort(int[] data, int start, int len) { |/5j0
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); f =B)jYI
} s8Xort&
} FE,&_J"
} $_%yr
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}