归并排序: wQ@Zwbx
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package org.rut.util.algorithm.support; $x/J+9Ww
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import org.rut.util.algorithm.SortUtil; gNG.l
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/** makaI0M
* @author treeroot AwtIWH*e
* @since 2006-2-2 kja4!_d
* @version 1.0 C-_(13S
*/ F_K
public class MergeSort implements SortUtil.Sort{ {npOlV
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/* (non-Javadoc) kBQ5]Q"
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) C+DG+_%V*S
*/ _xa}B,H
public void sort(int[] data) { ex{)mE4Cd
int[] temp=new int[data.length]; Fka1]|j9
mergeSort(data,temp,0,data.length-1); k>7gy?Y!K<
} u}^a^B$
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private void mergeSort(int[] data,int[] temp,int l,int r){ | pF5`dX
int mid=(l+r)/2; !Jk(&.
if(l==r) return ; i-|/2I9 %
mergeSort(data,temp,l,mid); -/@|2!d
mergeSort(data,temp,mid+1,r); !IfI-Q
for(int i=l;i<=r;i++){ U+(Z#b(Q
temp=data; JHnk%h0
} K-N]h
int i1=l; BERn _5gb
int i2=mid+1; +8L(pMI4
for(int cur=l;cur<=r;cur++){ w:~nw;.T
if(i1==mid+1) f6keWqv<GW
data[cur]=temp[i2++]; Np|:dP9#}
else if(i2>r) n$XMsl.>
data[cur]=temp[i1++]; rhlW
else if(temp[i1] data[cur]=temp[i1++]; md1EJ1\14
else |!?2OTY
data[cur]=temp[i2++]; jydp4ek_n
} K0d-MC
} 0IoXDx
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} o[5=S,'
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改进后的归并排序: S3%.-)ib
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package org.rut.util.algorithm.support; ,mAB)at
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import org.rut.util.algorithm.SortUtil; '6Pu[^x
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/** \'\N"g`Fr
* @author treeroot sR7{ i
* @since 2006-2-2 [TiTff&LV
* @version 1.0 w>H%[\Qs
*/ MEdIw#P.}{
public class ImprovedMergeSort implements SortUtil.Sort { \NvC
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private static final int THRESHOLD = 10; #+2:d?t
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/* +X2 i/}
* (non-Javadoc) k1QpX@
* ];d5X
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) i_oro"%yL
*/ wiK@o$S-
public void sort(int[] data) { lOowMlf@2
int[] temp=new int[data.length]; W TXD4}
mergeSort(data,temp,0,data.length-1); w@gl
} `? 9]'
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private void mergeSort(int[] data, int[] temp, int l, int r) { %x cM_|AyR
int i, j, k; zm;*:]S
int mid = (l + r) / 2; =F^->e0N
if (l == r) }iiG$?|.
return; ne!j%9Ar
if ((mid - l) >= THRESHOLD) 7gZVg@
mergeSort(data, temp, l, mid); q/ d5P
else 1pYmtr
insertSort(data, l, mid - l + 1); 0`g}(}'L
if ((r - mid) > THRESHOLD) `JY>v io
mergeSort(data, temp, mid + 1, r); xVh\GU855
else q>(I*=7
insertSort(data, mid + 1, r - mid); 8JjU 9#
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for (i = l; i <= mid; i++) { kMJQeo79
temp = data; {"gyXDE1
} O3<Y _I^
for (j = 1; j <= r - mid; j++) { eaYkYuS/
temp[r - j + 1] = data[j + mid]; ^J#*n;OQ3A
} Ht=6P)
int a = temp[l]; m_r@t*
int b = temp[r]; x[.z"$T@
for (i = l, j = r, k = l; k <= r; k++) { r[UyI3(i^
if (a < b) { b.%B;qB
data[k] = temp[i++]; dc\u$'F@S
a = temp; Yt O@n@1
} else { u75)>^:I
data[k] = temp[j--]; <L!~f`nH2
b = temp[j]; Z)6nu)
} ZB_16&2Ow
} **w*hd]
} W O+?gu
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/** 5u
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* @param data 3wa<,^kqy
* @param l r:8]\RU
* @param i ]\os`At
*/ :>er^\
private void insertSort(int[] data, int start, int len) { \0^r J1*
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); t7*H8
} Hq"<vp
} _A~~L6C
} v,!Y=8~9
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}