归并排序:
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package org.rut.util.algorithm.support; bc?\lD$$
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import org.rut.util.algorithm.SortUtil; >o]!-46
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/** 95wi~^^
* @author treeroot >{seaihK
* @since 2006-2-2 OzVCqq"]
* @version 1.0 H'Oy._,]t
*/ VP7g::Ab
public class MergeSort implements SortUtil.Sort{ EDl*UG83G
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/* (non-Javadoc) ,[}
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ,R-T( <r
*/ 0gLl>tF[H
public void sort(int[] data) {
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int[] temp=new int[data.length]; _uYidtxo=
mergeSort(data,temp,0,data.length-1); \4/zvlo]h
} OH(w3:;[8
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private void mergeSort(int[] data,int[] temp,int l,int r){ hLv~N}
int mid=(l+r)/2; SH009@l_8
if(l==r) return ; F&Bh\C)]
mergeSort(data,temp,l,mid); r+0<A.''a
mergeSort(data,temp,mid+1,r); ]#7{x
for(int i=l;i<=r;i++){ QGR}`n2D
temp=data; THVF(M4v
} ou{}\^DgQ
int i1=l; \6{w#HsP8
int i2=mid+1; 69 >-
for(int cur=l;cur<=r;cur++){ /S9(rI<'
if(i1==mid+1) TZl^M h[a
data[cur]=temp[i2++]; V1P]mUs{1
else if(i2>r) Sj[iKCEKtv
data[cur]=temp[i1++]; ty W5k(>
else if(temp[i1] data[cur]=temp[i1++]; R2e":`0I
else *NC9S,eSP
data[cur]=temp[i2++]; /.1yxb#Z?,
} >!D^F]CH
} iF_#cmSy$
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改进后的归并排序: c*k%r2'
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package org.rut.util.algorithm.support; (}#8$ )
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import org.rut.util.algorithm.SortUtil; I1a>w=x!+
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/** InAx;2'A:
* @author treeroot 9 W7 ljUg
* @since 2006-2-2 Wq+a5[3"
* @version 1.0 wm'a)B?
*/ t1Zcr#b>
public class ImprovedMergeSort implements SortUtil.Sort { +sW;p?K7eO
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private static final int THRESHOLD = 10; SqF `xw
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/* |#Gug('
* (non-Javadoc) F=B[%4q`%
* (/^s?`1{N?
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) k6}M7&nY
*/ *K57($F
public void sort(int[] data) { TI<?h(*R_
int[] temp=new int[data.length]; Q|6lp
mergeSort(data,temp,0,data.length-1); ]U,c`?[7#
} X%Lhu6F
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private void mergeSort(int[] data, int[] temp, int l, int r) { $M0F~x
int i, j, k; UZV\]Y
int mid = (l + r) / 2; qdOUvf
if (l == r) lB(E:{6OZ
return; qDVt
if ((mid - l) >= THRESHOLD) @mJ#~@*(
mergeSort(data, temp, l, mid); e2dg{n$6"
else f i_'Ny>#
insertSort(data, l, mid - l + 1); 38 -vt,|
if ((r - mid) > THRESHOLD) eXYf"hU,
mergeSort(data, temp, mid + 1, r); TdCC,/c3
else B1U<m=Y
insertSort(data, mid + 1, r - mid); sU=7)*$
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for (i = l; i <= mid; i++) { %3:[0o={d
temp = data; J-k/#A4o
} K!+IRA@
for (j = 1; j <= r - mid; j++) { 8E+]yB"
temp[r - j + 1] = data[j + mid]; moOc
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} +NT8dd
int a = temp[l]; O6[4=4L
int b = temp[r]; _1hiNh$
for (i = l, j = r, k = l; k <= r; k++) { Bw{enf$vR
if (a < b) { ,bGYixIfYZ
data[k] = temp[i++]; {tDH !sX
a = temp; M}S1Zz%Ii1
} else { )ZQ>h{}D
data[k] = temp[j--]; #3_t}<fX
b = temp[j]; eJvNUBDSH
} n$u@v(I
} Bs!F |x(
} qj#C8Tc7
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/** _X6@.sM/2
* @param data TSEv^u)3
* @param l j`o_Stbg
* @param i <Crbc$!OeX
*/ F*, e,s
private void insertSort(int[] data, int start, int len) { |nMg.t`8
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); yP^C)
} Pe,:FIp,
} 0|=,!sY
}
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}