归并排序: Ky[s&>02
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package org.rut.util.algorithm.support; ~`yO@f;D
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import org.rut.util.algorithm.SortUtil; kltorlH
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/** ^i[bo3
* @author treeroot =[do([A
* @since 2006-2-2 aE(DNeG-H
* @version 1.0 <5O:jd
*/ ;.+C
public class MergeSort implements SortUtil.Sort{ ,Jrm85oG
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/* (non-Javadoc) )6b`1o!7
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 0g'MFS
*/ 6qR5A+|;
public void sort(int[] data) { I+eKuWB
int[] temp=new int[data.length]; >1BDt:G36
mergeSort(data,temp,0,data.length-1); bt=z6*C>A
} yRy^'E~
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private void mergeSort(int[] data,int[] temp,int l,int r){ \ORE;pG
int mid=(l+r)/2; 6DVHJ+WTV
if(l==r) return ; ?G>E[!8ev
mergeSort(data,temp,l,mid); ;q?WU>c{?
mergeSort(data,temp,mid+1,r); F]GX;<`
for(int i=l;i<=r;i++){ c8h71Cr
temp=data; BN1,R] *;
} +?'a2pUS
int i1=l; ]?sw<D{
int i2=mid+1; Yij_'0vZ
for(int cur=l;cur<=r;cur++){ G?+0#?'Y
if(i1==mid+1) s:xt4<
data[cur]=temp[i2++]; )0o|u >
else if(i2>r) 9}T(m(WQVu
data[cur]=temp[i1++]; {W'{A
else if(temp[i1] data[cur]=temp[i1++]; ~Dbu;cqR@
else \*mKctpz]6
data[cur]=temp[i2++]; h'B0rVQia>
} Hy1pIUsx
} ef K
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} Dc9Fb^]QOG
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改进后的归并排序: zP>=K
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package org.rut.util.algorithm.support; w""
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import org.rut.util.algorithm.SortUtil; T5eJIc3a"
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/** 9gFfbvd
* @author treeroot Va$JfWef
* @since 2006-2-2 TOsHb+Uv
* @version 1.0 4oPr|OKj{*
*/ a?X#G/)
public class ImprovedMergeSort implements SortUtil.Sort { V!f'
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private static final int THRESHOLD = 10; ~}Z'/zCZf
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/* ,#.9^J
* (non-Javadoc) S[y?>
* ]GiDfYs7%
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Mb+CtI_'
*/ -:Jn|=
public void sort(int[] data) { n ==+NL
int[] temp=new int[data.length]; b/UjKNf@
mergeSort(data,temp,0,data.length-1); Q oWjC
} "v+%F
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private void mergeSort(int[] data, int[] temp, int l, int r) { "uU[I,h
int i, j, k; q;<Q-jr&O
int mid = (l + r) / 2; ~2}^
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if (l == r) (*G'~gSX
return;
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if ((mid - l) >= THRESHOLD) 8]&lUMaqVZ
mergeSort(data, temp, l, mid); 98!H$6k
else `$>cQwB,D
insertSort(data, l, mid - l + 1); +||[H)qym
if ((r - mid) > THRESHOLD) +\66; 7]s
mergeSort(data, temp, mid + 1, r); An=Q`Uxt/
else /i
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insertSort(data, mid + 1, r - mid); @,SN8K0T
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for (i = l; i <= mid; i++) { EK}QjY[i
temp = data; '?b.t2
} Iq(;?_
for (j = 1; j <= r - mid; j++) { o[>p
temp[r - j + 1] = data[j + mid]; y:dwx *Q9I
} 0zqTX< A
int a = temp[l]; B=hJ*;:p
int b = temp[r]; !gG\jC~n
for (i = l, j = r, k = l; k <= r; k++) { G2hBJTW
if (a < b) { 5U.,iQ(d
data[k] = temp[i++]; )q'~<QxI\
a = temp; uH8`ipX
} else { .iH#8Z
data[k] = temp[j--]; YbE1yOJ&m
b = temp[j]; J!*Pg<
} Zq>}SR
} BXX1G
} <P<^,aC/j
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/** uT{.\qHo
* @param data dWhF[q"
* @param l Ujss?::`G
* @param i ;AE%f.Y
*/ fa;GM7<e)
private void insertSort(int[] data, int start, int len) { D(gpF85t
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); -QP&A >]7
} gfAVxMg
} 'gv7&$X}4
} g bwg3$!9
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}