归并排序: 4k-+?L!/G
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package org.rut.util.algorithm.support; O3DmNq$dz
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import org.rut.util.algorithm.SortUtil; U-/{0zB
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/** [l,Ei?
* @author treeroot B^g ?=|{
* @since 2006-2-2 O)vp~@|
* @version 1.0 S_Wrw z
*/ ^0 -:G6H
public class MergeSort implements SortUtil.Sort{ eLfk\kk]Pc
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/* (non-Javadoc) )% ~OH
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 3v1iy/ /
*/ Q|#W#LV,K
public void sort(int[] data) { J??-j
int[] temp=new int[data.length]; K1 EynU
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mergeSort(data,temp,0,data.length-1); MQ5R O;RY
} a{^m-fSaR"
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private void mergeSort(int[] data,int[] temp,int l,int r){ ObVGV
int mid=(l+r)/2; e:fy#,HEj{
if(l==r) return ; Ql/cN%^j$
mergeSort(data,temp,l,mid); BTGvN%
mergeSort(data,temp,mid+1,r); $q6BP'7
for(int i=l;i<=r;i++){ .}t~'*D
temp=data; y{ibO}s
} x$5) ^ud?
int i1=l; 1+szG1U=
int i2=mid+1; re/@D@%
for(int cur=l;cur<=r;cur++){ cv998*|X:
if(i1==mid+1) dP#|$1
data[cur]=temp[i2++]; 6&
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else if(i2>r) PF)jdcX
data[cur]=temp[i1++]; [I'0,y
else if(temp[i1] data[cur]=temp[i1++]; zM bN;tu
else Cn'(<bl
data[cur]=temp[i2++]; 1C}NQ!.
} wvO|UP H\
} /oR0+sH]
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改进后的归并排序: 6G1@smP
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package org.rut.util.algorithm.support; /xsF90c\h
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import org.rut.util.algorithm.SortUtil; Sh/T ,
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/** k[bD\'
* @author treeroot G}:w@}h/
* @since 2006-2-2 q"%_tS
* @version 1.0 qs1 ?IYD
*/ v'U{/ ,x
public class ImprovedMergeSort implements SortUtil.Sort { ~ DBcIy?
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private static final int THRESHOLD = 10; I/a/)No
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/* 1M}5>V{
* (non-Javadoc) _kj wFq
* N9jH\0nG
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) !
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*/ zfc'=ODX
public void sort(int[] data) { uehDIl0\[b
int[] temp=new int[data.length]; 8"U. Hnu
mergeSort(data,temp,0,data.length-1); MXw hxk#E
} vK9E
{ &"CH]r
private void mergeSort(int[] data, int[] temp, int l, int r) { {l>yi
int i, j, k; v*;-yG&
int mid = (l + r) / 2; H7d/X
if (l == r) 4? ICy/,U-
return; ;LG#.~f
if ((mid - l) >= THRESHOLD) e4!:c^?
mergeSort(data, temp, l, mid); e8pG"`wM8
else ~Lm$i6E<
insertSort(data, l, mid - l + 1); m;'6MHx;
if ((r - mid) > THRESHOLD) O_ChxX0KP
mergeSort(data, temp, mid + 1, r); ?$*SjZt
else \MbB#
insertSort(data, mid + 1, r - mid); <~6h|F8
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for (i = l; i <= mid; i++) { eO?p*"p" F
temp = data; U^Q:Y}^
} $})g?Q
for (j = 1; j <= r - mid; j++) { (Dw,DY9
temp[r - j + 1] = data[j + mid]; )2bvQy8K
} ~F4fFQ-yy
int a = temp[l]; sejg&8
int b = temp[r]; ;\]b T;#
for (i = l, j = r, k = l; k <= r; k++) { ~io szX
if (a < b) { PcA2/!a
data[k] = temp[i++]; y9x w
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a = temp; U%<koD[,
} else { K
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data[k] = temp[j--]; E%rk[wI
b = temp[j]; ^>i63Yc
} \P.I)n`8 y
} Hea;?4Vg
} t.7?
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/** \.-}adKg
* @param data $,,op(
* @param l )%`^xR
* @param i L3@82yPo!
*/ =<?+#-;p
private void insertSort(int[] data, int start, int len) { v^#~98g]
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); Dp)=0<$y
} WU71/PYm`
} a-=8xs'
} .P[ _<8
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}