归并排序: ;GFB@I@
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package org.rut.util.algorithm.support; <!}l~Ln15
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import org.rut.util.algorithm.SortUtil; =l2Dm
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/** tb?F}MEe
* @author treeroot Oqpl2Y"/
* @since 2006-2-2 wEnuUC4j
* @version 1.0 -N8cjr4l
*/ BT#=Xh
public class MergeSort implements SortUtil.Sort{ Qj<{oZp&
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/* (non-Javadoc) `o8{qU,*]N
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) .d~]e2x
*/ SAG`^t
public void sort(int[] data) { yvooM'R
int[] temp=new int[data.length]; fHe0W
mergeSort(data,temp,0,data.length-1); e4=FU&RpNH
} ;j>Vt?:Pw
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private void mergeSort(int[] data,int[] temp,int l,int r){ 1KYbL8c
int mid=(l+r)/2; Xm8Z+}i
if(l==r) return ; 9U=fJrj'u
mergeSort(data,temp,l,mid); RJRq` T|m
mergeSort(data,temp,mid+1,r); ~S^X"8(U
for(int i=l;i<=r;i++){ :qAc= IC%
temp=data; |ON&._`LH
} C](z#c~c
int i1=l; RF4$
int i2=mid+1; 'o/N}E!Pt
for(int cur=l;cur<=r;cur++){ S0N2rU
if(i1==mid+1) T1(j l)
data[cur]=temp[i2++]; (~ ]g,*+
else if(i2>r) v;fJM5PA
data[cur]=temp[i1++]; r}oURy,5
else if(temp[i1] data[cur]=temp[i1++]; WjY{rM,K
else rmPne8D=c(
data[cur]=temp[i2++]; A-a17}fta
} [arTx^
} >,>;)B@J
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} $bZu^d,
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改进后的归并排序: YgfSC}a
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package org.rut.util.algorithm.support; +z:CZ(fb
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import org.rut.util.algorithm.SortUtil; k-WHHoU>o
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/** =PNdP
* @author treeroot 6kt]`H`cfJ
* @since 2006-2-2 %bIsrQ~B
* @version 1.0 Kajkw>z
*/ Ky[bX
public class ImprovedMergeSort implements SortUtil.Sort { X,RT<GNNb
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private static final int THRESHOLD = 10; VLcyPM@"Q!
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/* L]k*QIn:h
* (non-Javadoc) gB]C&Q
* owE<7TGPI?
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) / <JY:1|
*/ 2X|CuL{]
public void sort(int[] data) { |EF>Y9
int[] temp=new int[data.length]; w$gSj/
mergeSort(data,temp,0,data.length-1); o" |O
]
} DpA\r_D
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private void mergeSort(int[] data, int[] temp, int l, int r) { UhsO\ 9}qH
int i, j, k; bt;lq!g
int mid = (l + r) / 2; "@.Z#d|Y
if (l == r) c}\
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return; 0/ut:RV0
if ((mid - l) >= THRESHOLD) "
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mergeSort(data, temp, l, mid); +x(YG(5\w
else hzaU8kb
insertSort(data, l, mid - l + 1); RNGO~:k?r
if ((r - mid) > THRESHOLD) Ay2b,q
mergeSort(data, temp, mid + 1, r); $zdd=.!KiK
else GF&_~48GD
insertSort(data, mid + 1, r - mid); Jf2e<?`
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for (i = l; i <= mid; i++) { <z,+Eg
temp = data; nt7|f,_J
} Ujf,6=M
for (j = 1; j <= r - mid; j++) { 8pqs?L@W
temp[r - j + 1] = data[j + mid]; Tj=gRQ2v
} d$}&nV/A)
int a = temp[l]; Qe_+r(3)k
int b = temp[r]; yKYl@&H/%
for (i = l, j = r, k = l; k <= r; k++) { 6VC-KY
if (a < b) { i&JpM]N
data[k] = temp[i++]; F"I*-!o
a = temp; }7%9}2}Iw
} else { :i.t)ES
data[k] = temp[j--]; a~,Kz\Tt
b = temp[j]; #00D?nC
} E30Ln_^o
} +s ULo
} GLCAiSMz[
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/** \0nlPXk?G
* @param data SnW7 x
* @param l
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* @param i Bhe{L?}0
*/ :5jexz."M
private void insertSort(int[] data, int start, int len) { b:1 L@8s;
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 9p4y>3
} D*QYKW=)
} )&:L'N
} t{zBC?cR
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}