归并排序: }:*?w>=
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package org.rut.util.algorithm.support; 7,Q7`}gBf
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import org.rut.util.algorithm.SortUtil; ~se
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/** a;(,$q3M
* @author treeroot gL1r"&^L
* @since 2006-2-2 [P]M)vJ**
* @version 1.0 6!){-IV
*/ s}DNu<"g
public class MergeSort implements SortUtil.Sort{ "AIS6%,
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/* (non-Javadoc) ,pW^>J
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 7e{w,.ny!
*/ o+\?E.%%g
public void sort(int[] data) { syb$%
int[] temp=new int[data.length]; fQw|SW
mergeSort(data,temp,0,data.length-1); - @KT#
} o
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private void mergeSort(int[] data,int[] temp,int l,int r){ }~#qDrK
int mid=(l+r)/2; W\e!rq
if(l==r) return ; f&XM|Bg
mergeSort(data,temp,l,mid); SB1\SNB
mergeSort(data,temp,mid+1,r); Eoug/we
for(int i=l;i<=r;i++){ XX5 ):1
temp=data; 1\q2;5
}
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int i1=l; g_}r)CgG|
int i2=mid+1; 9KVeFl
for(int cur=l;cur<=r;cur++){ Yz0ruhEMk
if(i1==mid+1) &>Q_
data[cur]=temp[i2++]; N0h"EV[
else if(i2>r) C26PQGo#$
data[cur]=temp[i1++]; $Xw .iN]g
else if(temp[i1] data[cur]=temp[i1++]; )p>BN|L
else t nz
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data[cur]=temp[i2++]; B&_ 62`
} &E$jAqc
} >A|6kzC
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改进后的归并排序: 1sZwW P
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package org.rut.util.algorithm.support; gM20n^
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import org.rut.util.algorithm.SortUtil; "xlf6pm%
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/** N\Byg jw|
* @author treeroot ZGa>^k[:
* @since 2006-2-2 zr?%k]A%UO
* @version 1.0 6pI=?g
*/ !SIGzj
public class ImprovedMergeSort implements SortUtil.Sort { b#R3=TQS8
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private static final int THRESHOLD = 10; "g\
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/* /] ce?PPC
* (non-Javadoc) vV-ATIf
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* {IJV(%E
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Y:]~~-f\~
*/ Eu\&}n`i
public void sort(int[] data) { EkM? Rs
int[] temp=new int[data.length]; *I`, L/
mergeSort(data,temp,0,data.length-1); ;RW!l pGjP
} mQBq-;
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private void mergeSort(int[] data, int[] temp, int l, int r) { F'W{\4
int i, j, k; s2iR }<
int mid = (l + r) / 2; 1b
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if (l == r) C',D"
return; /sH3Rk.>
if ((mid - l) >= THRESHOLD) 7_d gQI3y
mergeSort(data, temp, l, mid); U;:>vi3p
else p8Di9\}
insertSort(data, l, mid - l + 1); CTbdY,=B
if ((r - mid) > THRESHOLD) -]R7[5C:
mergeSort(data, temp, mid + 1, r); HQK%Y2S
else tQbDP!,A*=
insertSort(data, mid + 1, r - mid); \i}n1Qd
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for (i = l; i <= mid; i++) { 97e fWYj
temp = data;
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} zFqH)/
for (j = 1; j <= r - mid; j++) { 41mg:xW(J
temp[r - j + 1] = data[j + mid]; g4&zBn
} [#kfl
int a = temp[l]; %+ig7a:
int b = temp[r]; ]y@9z b
for (i = l, j = r, k = l; k <= r; k++) { ;#P@(ZVT
if (a < b) { _\>? .gg$
data[k] = temp[i++]; Fd2Eq&:en$
a = temp; cPi 3UjY~
} else { :Sk0?WU
data[k] = temp[j--]; U_m<W$"HF
b = temp[j]; Gn#5zx#l
} mm'n#%\G
} WmP"u7I4
} /$'tO3
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/** BJ<hP9#
* @param data cP`f\\c
* @param l :" g^y6i
* @param i 'W3>lAPx!
*/ *oL?R2#7
private void insertSort(int[] data, int start, int len) { }RYr)
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); f{FW7T}O2
} f%` =>l
} X,:^})]
} )9 5&-Hs
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}