归并排序: t]B`>SL3W
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package org.rut.util.algorithm.support; =d;a1AO{&
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import org.rut.util.algorithm.SortUtil; iZ]^JPU}
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/** Y~Uf2(7b5
* @author treeroot L 0Ckw},,
* @since 2006-2-2 KcT(/!
* @version 1.0 %s}{5Qcl/
*/ DcxT6[
public class MergeSort implements SortUtil.Sort{ "/R?XCBZsb
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/* (non-Javadoc) @.L#u#
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) CV[ 9i
*/ 'A[PUSEE
public void sort(int[] data) { +=W(c8~P
int[] temp=new int[data.length]; &DW !$b
mergeSort(data,temp,0,data.length-1); i6bUJtL
} Da<`|
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private void mergeSort(int[] data,int[] temp,int l,int r){ ",~ZO<P
int mid=(l+r)/2; );HhV,$n
if(l==r) return ; (%6fZ
mergeSort(data,temp,l,mid); O=K0KOj
mergeSort(data,temp,mid+1,r); F*G]Na@6D
for(int i=l;i<=r;i++){ U9BhtmY
temp=data; c6jVx_tt.
} ;Qt%>Uo8
int i1=l; %Ja0:e
int i2=mid+1; !}}
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for(int cur=l;cur<=r;cur++){ N(i.E5&9
if(i1==mid+1) <mJ8~
data[cur]=temp[i2++]; )-I/ej^
else if(i2>r) %S%UMA.
data[cur]=temp[i1++]; 8A0a/
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else if(temp[i1] data[cur]=temp[i1++]; l>|scs;TI
else |zRrGQYm
data[cur]=temp[i2++]; `j{q
} .8'c
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} 0`pCgF
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} w.rcYywI
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改进后的归并排序: `\##M=
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package org.rut.util.algorithm.support; OeGLMDw
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import org.rut.util.algorithm.SortUtil; me@`;Q3
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/** SWtqp(h]'
* @author treeroot X#by Dg
* @since 2006-2-2 bR}fj.gP
* @version 1.0 ,5U[#6^
*/ k^d^Todq.
public class ImprovedMergeSort implements SortUtil.Sort { h143HXBi1+
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private static final int THRESHOLD = 10; XlX t,
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/* 'JgCl'k,
* (non-Javadoc) Z molL0y
* ]D~Ibv{Y
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) h}tC+_"D
*/ -F(luRBS(W
public void sort(int[] data) { J3'q.Pc
int[] temp=new int[data.length]; q`8
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mergeSort(data,temp,0,data.length-1); d %FLk=]
} Sz|kXk6&9
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private void mergeSort(int[] data, int[] temp, int l, int r) { r(>812^\
int i, j, k; 8mOGEx
int mid = (l + r) / 2; E>/~:
if (l == r) qHheF%[\5
return; P
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if ((mid - l) >= THRESHOLD) b{&'r~
mergeSort(data, temp, l, mid); cBbumf 9C
else @#^Y#
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insertSort(data, l, mid - l + 1); tZx}/&m-
if ((r - mid) > THRESHOLD) com4@NK
mergeSort(data, temp, mid + 1, r); ?v:FGO
else FzSL[S4i
insertSort(data, mid + 1, r - mid); FbMtor
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for (i = l; i <= mid; i++) { 2rC&
temp = data; V^!^wLLi
} V60"j(
for (j = 1; j <= r - mid; j++) { [zq2h3r
temp[r - j + 1] = data[j + mid]; -awG14%
} Lop=._W
int a = temp[l]; =>h~<88#5
int b = temp[r]; QeAkuqT'[
for (i = l, j = r, k = l; k <= r; k++) { UUql"$q
if (a < b) { d7QQ5FiB
data[k] = temp[i++]; KWV{wW=-
a = temp; !NOvKC!
} else { ~&IL>2-B
data[k] = temp[j--]; =mk7'A>l
b = temp[j]; Ol@
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} V/!8q`lYNJ
} I1(,J
} {=d\t<p*n
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/** PFIL)D
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* @param data )Nq$~aAm
* @param l f&>Q6 {*]
* @param i o' DXd[y
*/ @le23+q
private void insertSort(int[] data, int start, int len) { Z5{M_^
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); R\=y/tw0H
} \G*vY#]
} ^Q_0Zq^H
} !-4pr[C
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}