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package org.rut.util.algorithm.support; H WOek"}Z[
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import org.rut.util.algorithm.SortUtil; 0vcET(
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/** !
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* @author treeroot /;b.-v&
* @since 2006-2-2 x1:vUHwC
* @version 1.0 lW&[mnR
*/ 6WCmp,*
public class MergeSort implements SortUtil.Sort{ wbl${@4
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/* (non-Javadoc) i:R!T,
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) "{mt?
*/ )ZviS.
public void sort(int[] data) { UVnrDhd!0
int[] temp=new int[data.length]; V~JBZ}`TG<
mergeSort(data,temp,0,data.length-1); *(>Jd|C
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private void mergeSort(int[] data,int[] temp,int l,int r){ Mn-<5 1.%
int mid=(l+r)/2; 2}GKHC
if(l==r) return ; G)jG!`I
mergeSort(data,temp,l,mid); [6oq##
mergeSort(data,temp,mid+1,r); xqU^I5Z
for(int i=l;i<=r;i++){ -fhAtxkg
temp=data; ?i/73H+;D3
} uFMs^^#
int i1=l; fHW-Je7mG
int i2=mid+1; %!>k#F^S
for(int cur=l;cur<=r;cur++){ s}Xi2^x
if(i1==mid+1) XlE$.
data[cur]=temp[i2++]; osI- o~#>
else if(i2>r) l85O-g}M
data[cur]=temp[i1++]; mMn2(
else if(temp[i1] data[cur]=temp[i1++]; bbM4A! N
else .Y+mwvLpRG
data[cur]=temp[i2++]; D[+|^,^>
} |>M-+@gj
} UU*0dSWr
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改进后的归并排序: 5ENov!$H
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package org.rut.util.algorithm.support; C+}CU}
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import org.rut.util.algorithm.SortUtil; B b$S^F(Xq
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/** ;:-}z.7Y
* @author treeroot ?S+/QyjcfJ
* @since 2006-2-2 p{+tFQy
* @version 1.0 i.B$?cr~
*/ :zRB)hd
public class ImprovedMergeSort implements SortUtil.Sort { c-?
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private static final int THRESHOLD = 10; 7
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/* C!CaGf=
* (non-Javadoc) Fmy1nZ
* ABd153oW"
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 8JQ<LrIt9
*/ }M;sz
public void sort(int[] data) { X`8Y[Vb3}
int[] temp=new int[data.length]; pT|./ Fe
mergeSort(data,temp,0,data.length-1); H&"_}
} (or =f`
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private void mergeSort(int[] data, int[] temp, int l, int r) { /&y,vkZTT
int i, j, k; @^w!% ?J
int mid = (l + r) / 2; Pc di
if (l == r) 8^&fZL',
return; ! hOOpZf7
if ((mid - l) >= THRESHOLD) @ J?-a m>
mergeSort(data, temp, l, mid); wWp?HDl"M
else RlG'|xaT
insertSort(data, l, mid - l + 1); .&aVx]
if ((r - mid) > THRESHOLD) UHTb61Gs
mergeSort(data, temp, mid + 1, r); &lO Xi?&"
else D3,t6\m
insertSort(data, mid + 1, r - mid); LR
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for (i = l; i <= mid; i++) { s>[vT?
temp = data; >KH(nc$
} !XG/,)A
for (j = 1; j <= r - mid; j++) { {&6l\|
temp[r - j + 1] = data[j + mid]; [346w
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} Th I
int a = temp[l]; $D0)j(v
int b = temp[r]; 0B#rqTEKu
for (i = l, j = r, k = l; k <= r; k++) { mP`,I"u
if (a < b) { #t5JUi%in*
data[k] = temp[i++]; >d1aE)?
a = temp; {|t?
} else { /9t*CEu\
data[k] = temp[j--]; D*<8e?F
b = temp[j]; [qc6Q:
} z{<q0.^EFh
} Lx4H/[$6D
} l,~ N~?
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/** b*$o[wO9
* @param data .pNq-T
* @param l =}6Z{}(TT
* @param i RQ_#rYmT
*/ ~a0d.dU
private void insertSort(int[] data, int start, int len) { r;5 AY
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); ]VO,}
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} 0^|$cvYiL
} }b\ipA,~
} *(_ON$+3
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}