归并排序: :~%{
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package org.rut.util.algorithm.support; uo[W|Q
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import org.rut.util.algorithm.SortUtil; ;kb);iT
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/** M
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* @author treeroot 5VhJ*^R`y
* @since 2006-2-2 c%vtg.A
* @version 1.0 1?,1EYT"
*/ -wrVhCd~g]
public class MergeSort implements SortUtil.Sort{ j$Wd[Ja+O
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/* (non-Javadoc) G"D=ozr
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) l[u=_uaYl
*/ _fE$KaP
public void sort(int[] data) { $,
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int[] temp=new int[data.length]; zyPc<\HoK
mergeSort(data,temp,0,data.length-1); $fFh4O4
} gjDxgNpa
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private void mergeSort(int[] data,int[] temp,int l,int r){ g8L{xwx<
int mid=(l+r)/2; SKeX~uLz
if(l==r) return ; {dXmSuO
mergeSort(data,temp,l,mid); /;clxtus
mergeSort(data,temp,mid+1,r); c4Wl^E8
for(int i=l;i<=r;i++){ ?{rpzrc!*
temp=data; cbaa*qoU
} O
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int i1=l; ViYfK7Z
int i2=mid+1; Vh'H =J
for(int cur=l;cur<=r;cur++){ dBNx2T}_0
if(i1==mid+1) L5 Q^cY]p
data[cur]=temp[i2++]; jHQnD]Hr
else if(i2>r) GiS:Nq`$(
data[cur]=temp[i1++]; DuI>z?bS
else if(temp[i1] data[cur]=temp[i1++]; /wT<p
else y ]D[JX[
data[cur]=temp[i2++]; U\GuCw
} ,4H/>yPw
} WO!'("
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} ?'RB'o~
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改进后的归并排序: |*n
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package org.rut.util.algorithm.support; kY^ k*-v
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import org.rut.util.algorithm.SortUtil; (d>}Fp
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/** p-XO4Pc6
* @author treeroot gAr=fq-|
* @since 2006-2-2 ]8/g[Ii
* @version 1.0 0,5)L\{
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*/ hI 1or4V
public class ImprovedMergeSort implements SortUtil.Sort { \dJOZ2J<z
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private static final int THRESHOLD = 10; N~~
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/* 1\ Gxk&
* (non-Javadoc) _o7t| pl~
* zEk/15
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ,{X}C
*/ qT~a`ou:
public void sort(int[] data) { \wF-[']N
int[] temp=new int[data.length]; W5,&*mo
mergeSort(data,temp,0,data.length-1); qNi`OVh&
} \>[k0<
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private void mergeSort(int[] data, int[] temp, int l, int r) { K$I`&M(
int i, j, k; XNJ3.w:R
int mid = (l + r) / 2; Zygu/M6
if (l == r) 6u>]-K5
return; K.Tob,5`
if ((mid - l) >= THRESHOLD) i
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mergeSort(data, temp, l, mid); >!Dp'6
else q~`dxq`}
insertSort(data, l, mid - l + 1); <b:xyHS
if ((r - mid) > THRESHOLD) bs0[ a 1/
mergeSort(data, temp, mid + 1, r); F-Bj
else ==AmL]*
insertSort(data, mid + 1, r - mid); pp@O6
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for (i = l; i <= mid; i++) { ZvwU
temp = data; *vzEfmN:d
} }0,dG4Oo=
for (j = 1; j <= r - mid; j++) { N}>[To3
temp[r - j + 1] = data[j + mid]; 2Q 5-.2]
} AQwai>eL
int a = temp[l]; |k^C-
int b = temp[r]; 055C1RV%
for (i = l, j = r, k = l; k <= r; k++) { $plqk^P
if (a < b) { [}!0PN?z~A
data[k] = temp[i++]; 6aLRnH"Ud
a = temp; ^?NLA&v<
} else { AuT:snCzR
data[k] = temp[j--]; % {-r'Yi%
b = temp[j]; Qk >9o
} zx5#eMD
} WPAT\Al&AE
} \/64Xv3L0
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/** &0i$Y\g
* @param data Fw:_O2
* @param l e07u@_'^
* @param i >gDeuye
*/ WLA&K]
private void insertSort(int[] data, int start, int len) { q@g#DP+C
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); OG9 '[o`8
} aWPf3Q
} $[Q;{Q
} 67XUhnE
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}