归并排序: p(7QAd4
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package org.rut.util.algorithm.support; +AK:(r
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import org.rut.util.algorithm.SortUtil; 8Inx/>eOI
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/** pN$;!
* @author treeroot \$;~74}
* @since 2006-2-2 Z5>V{o
* @version 1.0 p`GWhI?
*/ xeB4r/6
public class MergeSort implements SortUtil.Sort{ ZPF7m{S
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/* (non-Javadoc) uu>lDvR*
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) S\|^ULrH
*/ E&%jeR
public void sort(int[] data) { \Hs|$
int[] temp=new int[data.length]; ~JE|f 7
mergeSort(data,temp,0,data.length-1); 79z)C35~
} +a]j[#
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private void mergeSort(int[] data,int[] temp,int l,int r){ *mV&K\_
int mid=(l+r)/2; SOH%Q_
if(l==r) return ; d~<QAh#rG
mergeSort(data,temp,l,mid); wsfysat$
mergeSort(data,temp,mid+1,r); @xJCn}`Zj
for(int i=l;i<=r;i++){ ] SK[C"
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temp=data; 2 `5=0E1k
} n4>cERfa
int i1=l; h]P/KVqR.
int i2=mid+1; S'?fJ.
for(int cur=l;cur<=r;cur++){ NQ!<f\m4n
if(i1==mid+1) J" bD\%
data[cur]=temp[i2++]; E{gv,cUM
else if(i2>r) ou;qO
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data[cur]=temp[i1++]; hrT%XJl
else if(temp[i1] data[cur]=temp[i1++]; QSmJ`Bm
else ]-KV0H
data[cur]=temp[i2++]; @,YlmX}
} fN0bIE
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} H56
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改进后的归并排序: 4OEKx|:5n
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package org.rut.util.algorithm.support; ~BQV]BJ7
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import org.rut.util.algorithm.SortUtil; l% |cB93
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/** \=8=wQv
* @author treeroot ,|iy1yg(
* @since 2006-2-2 jnDQ{D
* @version 1.0 q\U4n[Zk
*/ }Eb]9c\
public class ImprovedMergeSort implements SortUtil.Sort { +',^((o
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private static final int THRESHOLD = 10; |1i]L @&
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/* UnjNR[=
* (non-Javadoc) 6s5b$x
* ,$BgR2^
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) tO4):i1
*/ T\cR2ZT~
public void sort(int[] data) { =Pj@g/25u
int[] temp=new int[data.length]; s@z{dmL
mergeSort(data,temp,0,data.length-1); QxA0I+i
} s<d!+<
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private void mergeSort(int[] data, int[] temp, int l, int r) { NGSS:
int i, j, k; PnJ*Zea
int mid = (l + r) / 2; mb~./.5F
if (l == r) enPLaiJ'|q
return; 94+/wzWvi
if ((mid - l) >= THRESHOLD) +:!ScG*
mergeSort(data, temp, l, mid); ~xE=mg4le
else Tr$i=
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insertSort(data, l, mid - l + 1); e^Aa!
if ((r - mid) > THRESHOLD) jPpRsw>
mergeSort(data, temp, mid + 1, r); eB7>t@ED
else &
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insertSort(data, mid + 1, r - mid); *0-v!\{
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for (i = l; i <= mid; i++) { &!6DC5
temp = data; T|!D>l'
} .
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for (j = 1; j <= r - mid; j++) { 2pjW,I!`
temp[r - j + 1] = data[j + mid]; O!yakU+
} L=,Y1nO:p
int a = temp[l]; &:q[-K@!
int b = temp[r]; pY,O_
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for (i = l, j = r, k = l; k <= r; k++) { ^aT;aP^l
if (a < b) { srsK:%`
data[k] = temp[i++]; @7 )Z
a = temp; u2\+?`Ox
} else {
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data[k] = temp[j--]; v8>!Gft
b = temp[j]; o|0
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} VkWO}
} N:OD0m%`)
} k3C"
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/** 6mi$.'
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* @param data tnN'V
* @param l z^gi[
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* @param i yS+(<
*/ ,7t3>9-M"
private void insertSort(int[] data, int start, int len) { ;FcExg|k
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); U%h7h`=F?
} 70duk:Ri0
} K q/~T7Ru
} Uld_X\;Q4
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}