归并排序: @M6F?;
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package org.rut.util.algorithm.support; 0|ekwTx.
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import org.rut.util.algorithm.SortUtil; '4}8WYKQ
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/** y?Pw6;e.
* @author treeroot v >s,*
* @since 2006-2-2 4'"WD0
* @version 1.0 |>b;M,`OO
*/ Cx&l0ZXHEX
public class MergeSort implements SortUtil.Sort{ wQ8<%qi"L
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/* (non-Javadoc) e?pQuF~
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) t/@t_6m}*
*/ i,rX.K}X
public void sort(int[] data) { 3`;1;T2$B
int[] temp=new int[data.length]; (9b%'@A@m
mergeSort(data,temp,0,data.length-1); zU'7x U-
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private void mergeSort(int[] data,int[] temp,int l,int r){ T.W^L'L`
int mid=(l+r)/2; UG3}|\.u
if(l==r) return ; tT+W>oA/M
mergeSort(data,temp,l,mid); F<b/)<Bm=
mergeSort(data,temp,mid+1,r); '7g]@Q7
for(int i=l;i<=r;i++){ IY|`$sHb
temp=data; j /@<=
} 7rG+)kHG
int i1=l; ;U#=H9_
int i2=mid+1; ,y@WFRsx
for(int cur=l;cur<=r;cur++){ J>"qeR
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if(i1==mid+1) +
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data[cur]=temp[i2++]; aq\Fh7
else if(i2>r) p0PK-e`@:
data[cur]=temp[i1++]; |.;]e[&
else if(temp[i1] data[cur]=temp[i1++]; H;0K4|I
else KwgFh#e
data[cur]=temp[i2++]; 5n1`$T.WG
} L`(\ud
} '
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改进后的归并排序: 6}~k4;'}A
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package org.rut.util.algorithm.support; 5 Pf)&iG
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import org.rut.util.algorithm.SortUtil; BAi`{?z$<
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/** }z,9!{~`
* @author treeroot nJ$2RN
* @since 2006-2-2 TpI8mDO\W
* @version 1.0 C-g,uARX(r
*/ Z<QNzJ D
public class ImprovedMergeSort implements SortUtil.Sort { (EjlnG}5l
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private static final int THRESHOLD = 10; ,/kZt!
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/* Nw(hN+_u
* (non-Javadoc) D&i,`j
* U.h2 (-p
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) =uEpeL~d;+
*/ nW<nOKTnk_
public void sort(int[] data) { bjI3xAs~
int[] temp=new int[data.length]; uG/'9C6Z
mergeSort(data,temp,0,data.length-1); &[SFl{fx>-
} AMASh*
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private void mergeSort(int[] data, int[] temp, int l, int r) { *IIA"tC
int i, j, k; )2# qi/
int mid = (l + r) / 2; [XubzZ9
if (l == r) #XG3{MGX[
return; R / ND f`
if ((mid - l) >= THRESHOLD) !yr4B"kz
mergeSort(data, temp, l, mid); f'*/IG
else (?TK P 7
insertSort(data, l, mid - l + 1); `P <#kt
if ((r - mid) > THRESHOLD) IusZY B
mergeSort(data, temp, mid + 1, r); :*^aSPlV
else *.KVrS<B1
insertSort(data, mid + 1, r - mid); eI-SWwmv/u
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for (i = l; i <= mid; i++) { FA := )
temp = data; 947;6a%$
} 3,2$Ny3N
for (j = 1; j <= r - mid; j++) { w'XN<RWA
temp[r - j + 1] = data[j + mid]; j\zlp
} Z9|A"[b
int a = temp[l]; s0:M'wA
int b = temp[r]; j@Pd"
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for (i = l, j = r, k = l; k <= r; k++) { 7GS4gSd3
if (a < b) { 5ArgM%
data[k] = temp[i++]; PKC0Dt;F.
a = temp; y%x:~.
} else { r;"D>IM\
data[k] = temp[j--]; n-{ d7haOa
b = temp[j]; X|G[Ma?
} oE6`]^^
} 7WY~v2SDF
} 1Kr$JIcd
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/** EUVD)+it
* @param data sv!v`zh
* @param l ?k($Tc&Q
* @param i =F}qT|K
*/ C`.eJF
private void insertSort(int[] data, int start, int len) { G e5Yz.Qv
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); l)~U8
} 2`j{n\/
} A{M7
} iOSt=-p
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}