归并排序: i;yz%Ug
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package org.rut.util.algorithm.support; 5PdC4vI*+
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import org.rut.util.algorithm.SortUtil; ;0@"1`
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/** }**^g:
* @author treeroot @@}A\wA-
* @since 2006-2-2 UT"L5{c
* @version 1.0 A9F Z`
*/ @"Do8p!*(6
public class MergeSort implements SortUtil.Sort{ v)BUt,A
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/* (non-Javadoc) HD Eq q
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) )07M8o!^l
*/ obUh+9K
public void sort(int[] data) { ?zxKk(J
int[] temp=new int[data.length]; k5W5 9tz
mergeSort(data,temp,0,data.length-1); uPb9j;Q?
} s|dL.@0,L
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private void mergeSort(int[] data,int[] temp,int l,int r){ )p( XY34]
int mid=(l+r)/2; ))u$j4V
if(l==r) return ; /ZX8gR5x
mergeSort(data,temp,l,mid); +STT(b Mn
mergeSort(data,temp,mid+1,r); VAV@Qn
for(int i=l;i<=r;i++){ IC7n;n9
temp=data; :x= ZvAvo
} r0?`t!%V
int i1=l; PE+N5n2Tl
int i2=mid+1; eF!c<
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for(int cur=l;cur<=r;cur++){ ;p1%KmK3
if(i1==mid+1) 0A\o8T.12
data[cur]=temp[i2++]; 2qw~hWX
else if(i2>r) W&6ye
data[cur]=temp[i1++]; @zSoPDYv,
else if(temp[i1] data[cur]=temp[i1++]; H`m|R
else dc"Vc 3)
data[cur]=temp[i2++]; HA"LU;5>2J
} vBq2JJAl
} P6;L\9=H<
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} +n1}({7m
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改进后的归并排序: QR<IHE{~8
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package org.rut.util.algorithm.support; #2|sS|0 <
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import org.rut.util.algorithm.SortUtil; "0nto+v
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/** SC"=M^E
* @author treeroot qDOx5.d
* @since 2006-2-2 oQFpIX;\m
* @version 1.0 >e"1a/2%>&
*/ n(-XI&Kn
public class ImprovedMergeSort implements SortUtil.Sort { z$H
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private static final int THRESHOLD = 10; G$Z8k,g+<7
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/* > lN{FJ
* (non-Javadoc) r!#NFek}
* ln#Lx&r;|
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) A .*}<
*/ TE^BfAw@
public void sort(int[] data) { Uo5l
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int[] temp=new int[data.length]; b'uH4[zX%
mergeSort(data,temp,0,data.length-1); `[/BG)4
} " ?n~ /9`
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private void mergeSort(int[] data, int[] temp, int l, int r) { Bu*ge~
int i, j, k; Fp|x,-
int mid = (l + r) / 2; m>:3Ku
if (l == r) FtT+Q$q=
return; (Kv[~W7lb
if ((mid - l) >= THRESHOLD) cqi: Rj
mergeSort(data, temp, l, mid); g@KS\.m]
else =)(sN"%
insertSort(data, l, mid - l + 1); -.i1l/FzP
if ((r - mid) > THRESHOLD) ^~8l|d_
mergeSort(data, temp, mid + 1, r); #Z(8 vA^@
else 8iR%?5 >K
insertSort(data, mid + 1, r - mid); #2{ };)
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for (i = l; i <= mid; i++) { -E?h^J&U
temp = data; Z#nj[r!l}
} bsR&%C
for (j = 1; j <= r - mid; j++) { ES<"YF
temp[r - j + 1] = data[j + mid]; bY&s$Ry3"
} #*1\h=bzmW
int a = temp[l]; i{
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int b = temp[r]; dGTAZ(1W
for (i = l, j = r, k = l; k <= r; k++) { 7[ *,t
if (a < b) { \P+lb-~\"
data[k] = temp[i++]; Hq< Vk.Nk
a = temp; SPn0D9b]
} else { g_5:o
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data[k] = temp[j--]; +mYD
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b = temp[j]; \<]nv}1O
} hA/K>Z
} sGc4^Z%l?
} n\ZDI+X
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/** J$v0
* @param data wYOSaGyZ0I
* @param l [D^KM|I%+
* @param i (KK9/k
*/ 7P.C~,+D%P
private void insertSort(int[] data, int start, int len) { J}nE,U2
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); .COY%fz
} 7.hn@_
} XW%!#S&;X
} Cj31'
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}