归并排序: ]N#%exBVo
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package org.rut.util.algorithm.support; EZw<)Q
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import org.rut.util.algorithm.SortUtil; R>CIEL
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/** VKtZyhK"h
* @author treeroot 'U|Tye i?
* @since 2006-2-2 g q`S`
* @version 1.0 a}#8n^2
*/ y$h.k"x`
public class MergeSort implements SortUtil.Sort{ ='U>P(
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/* (non-Javadoc) tpQ?E<O
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 5p]Cwj<u
*/ p@Va`:RDW
public void sort(int[] data) { mcgkNED
int[] temp=new int[data.length]; %+F%C=GqI
mergeSort(data,temp,0,data.length-1); #@^mA{Dt5
} B*c@w~E
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private void mergeSort(int[] data,int[] temp,int l,int r){ Q}qw`L1
int mid=(l+r)/2; a|5^4 J\%
if(l==r) return ; }s>.Fh
mergeSort(data,temp,l,mid); ?mME^?x
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mergeSort(data,temp,mid+1,r); POl_chq
for(int i=l;i<=r;i++){ Dqz9NB
temp=data; QY}1i .f
} 6upCL:A~r
int i1=l; Z+EN]02|
int i2=mid+1; kE`V@F
for(int cur=l;cur<=r;cur++){ 5+yT{,(5
if(i1==mid+1) S`?L\R.:
data[cur]=temp[i2++]; 6vL+qOd x
else if(i2>r) 9s9_a4t5
data[cur]=temp[i1++]; 3{"M N=
else if(temp[i1] data[cur]=temp[i1++]; |Js?@
else x4 .Y&Wq#
data[cur]=temp[i2++]; C(jUM!m
} +[C><uP
} Hi5}s
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改进后的归并排序: 78n`VmH~L
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package org.rut.util.algorithm.support; *s[bq;$
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import org.rut.util.algorithm.SortUtil; -NuRf#
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/** UX!)\5-
* @author treeroot Pko2fJt1
* @since 2006-2-2 lQ!)0F
* @version 1.0 xzrA%1y
*/ Pi&8!e<
public class ImprovedMergeSort implements SortUtil.Sort { 9 U!-Zn!
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private static final int THRESHOLD = 10; +GDT@,/
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/* }_GI%+t
* (non-Javadoc) p^/6Rb"e
* L,PD4H"8
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) WiBO8N,%`
*/ d|Q_Z@;JF
public void sort(int[] data) { qQ=\R1l
int[] temp=new int[data.length]; *!p#1fE
mergeSort(data,temp,0,data.length-1); cq-UVk"Gl
} 2C@s-`b
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private void mergeSort(int[] data, int[] temp, int l, int r) { %g+*.8;"b
int i, j, k; J3P)oM[
int mid = (l + r) / 2; v$_YZm{!<
if (l == r) B+Ox#[<75
return; 4,.B#: 8
if ((mid - l) >= THRESHOLD) )e6)~3[^
mergeSort(data, temp, l, mid); 8IrA{UU
else s+RSAyU
insertSort(data, l, mid - l + 1); 6OOdVS3\J
if ((r - mid) > THRESHOLD) "PhP1;A9,
mergeSort(data, temp, mid + 1, r); -w#*~Q{'*
else i<ug("/
insertSort(data, mid + 1, r - mid); ,'0Zd(s
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for (i = l; i <= mid; i++) { `L#`WC@[o
temp = data; "S ~(|G
} XI"8d.VR
for (j = 1; j <= r - mid; j++) { $lYy `OuC
temp[r - j + 1] = data[j + mid]; \n}@}E L
} t7].33%\
int a = temp[l]; G:k]tZ*`
int b = temp[r]; ?9I=XTR
for (i = l, j = r, k = l; k <= r; k++) { h:qt?$]J
if (a < b) { ~n<U8cm O
data[k] = temp[i++]; Mb0l*'ZF
a = temp; ^}>Ie03m50
} else { \4qwLM?E^
data[k] = temp[j--]; S]#xG+$<
b = temp[j]; vvvH5NRm
} BXx0Z
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} wEu"X
} w,/&oe5M+
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/** d \[cFe1d
* @param data J/ !Mt
* @param l yCt,-mz!z
* @param i |1z?#@BH
*/ %n7mN])
private void insertSort(int[] data, int start, int len) { vsDR@Y}k
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); !rwe|"8m?u
} :p6.v>s8
} b{WEux{)
} 6.|Qyk*
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}