归并排序: 2uZ
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package org.rut.util.algorithm.support; gZ%B9i:
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import org.rut.util.algorithm.SortUtil; %O%+TR7Z
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/** [5:,+i
* @author treeroot $@FD01h.t3
* @since 2006-2-2 dD1`[%
* @version 1.0 M]!R}<]{
*/ Z%D*2wm4
public class MergeSort implements SortUtil.Sort{ a~Sf~ka
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/* (non-Javadoc) }+nC}A"BC
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) OwwH 45
*/ Oq(_I
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public void sort(int[] data) { }.3F|H
int[] temp=new int[data.length]; K0@2>nR
mergeSort(data,temp,0,data.length-1); @%IZKYfc~
} P1vr}J
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private void mergeSort(int[] data,int[] temp,int l,int r){ ta> g:
int mid=(l+r)/2; R,C)|*ef
if(l==r) return ; !.zUY6
mergeSort(data,temp,l,mid); ({yuwH?tH
mergeSort(data,temp,mid+1,r); ME[Wg\
for(int i=l;i<=r;i++){ >T%Jlj3ZG
temp=data; ^b~&}uU
} o*:VG\#Z6
int i1=l; t LdBnf
int i2=mid+1; C?#if;c
for(int cur=l;cur<=r;cur++){ VQZ3&]o
if(i1==mid+1) KwN o/x|
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data[cur]=temp[i2++]; g^NdN46%
else if(i2>r) a_^3:}i~D
data[cur]=temp[i1++]; 6TbDno/!'
else if(temp[i1] data[cur]=temp[i1++]; u6'vzLmM
else o{4ya jt
data[cur]=temp[i2++]; j1N1c~2
} 3I^KJ/)A
} g(33h2"
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} %/,PY>:|
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改进后的归并排序: kWF4k
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package org.rut.util.algorithm.support; WHBQA\4
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import org.rut.util.algorithm.SortUtil; ibl^A=
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/** $N5VoK
* @author treeroot "z69jxXo
* @since 2006-2-2 i6kW"5t
* @version 1.0 S6 $S%$
*/ X8ev uN
public class ImprovedMergeSort implements SortUtil.Sort { />Wh
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private static final int THRESHOLD = 10; &"._%S58V
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/* X@b$C~+
* (non-Javadoc) @~ N:F~
* C:hfI;*7
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) +N5G4t#.
*/ F]
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public void sort(int[] data) { :)c >5
int[] temp=new int[data.length]; %bt2^
mergeSort(data,temp,0,data.length-1); [NFg9y;{h
} 1#^[{XlAx
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private void mergeSort(int[] data, int[] temp, int l, int r) { o2W pi
int i, j, k; x]euNa
int mid = (l + r) / 2; zek\AQN
if (l == r) T5z %X:VD(
return; .Y&_k
if ((mid - l) >= THRESHOLD) =oluw|TCe7
mergeSort(data, temp, l, mid); itm;, Sbg
else .'lc[iI9)d
insertSort(data, l, mid - l + 1); FMwT4]y
if ((r - mid) > THRESHOLD) |^S[Gr w
mergeSort(data, temp, mid + 1, r); x-nwo:OA
else iEr|?,
insertSort(data, mid + 1, r - mid); `tVBV:4\
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for (i = l; i <= mid; i++) { Ki^m&P
temp = data; R=i$*6}a
} ,ZD!Qb
for (j = 1; j <= r - mid; j++) { W$EX6jTGI
temp[r - j + 1] = data[j + mid]; bC$n+G>6k
} cK(}B_D$
int a = temp[l]; PP. k>zsx
int b = temp[r]; j6/ 3p|E
for (i = l, j = r, k = l; k <= r; k++) { J%aW^+O
if (a < b) { 8<^[xe
data[k] = temp[i++]; \Wt&z,
a = temp; k|BY 7C
} else { E-*udQ
data[k] = temp[j--]; ,$}P<WZMu
b = temp[j]; oMLpl3pl
} dWR?1sV|e
} /{>ds-;-
} y3 LWh}~E
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/** bTA<AoW9="
* @param data ^P"t
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* @param l 2EG"xA5%
* @param i np=m~k
*/ s_zZ@azJ
private void insertSort(int[] data, int start, int len) { '(+l77G
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); j[iJo
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} K._1sOw'"Y
} Z6K9E=%)c
} 2J 9eeN
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}