归并排序: B-wF1!Jv
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package org.rut.util.algorithm.support; _xM3c&VeG
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import org.rut.util.algorithm.SortUtil; $Zj3#l:rK
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/** 8aVj@x$'
* @author treeroot Z& bIjp
* @since 2006-2-2 fz%e?@>q
* @version 1.0 0NXaAf:2Z
*/ '\P+Bu]6&
public class MergeSort implements SortUtil.Sort{ [6%y RQ_
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/* (non-Javadoc) [jTZxH<
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) +<3e@s&
*/ {"_V,HmEF+
public void sort(int[] data) { ]:Pkh./
int[] temp=new int[data.length]; 1n#{c5T
mergeSort(data,temp,0,data.length-1); )H{OqZZYD
} ;pG5zRe
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private void mergeSort(int[] data,int[] temp,int l,int r){ yS4nB04`=
int mid=(l+r)/2; `m\ ?gsw7
if(l==r) return ; R.rE+gxO1
mergeSort(data,temp,l,mid); @4>?Y=#
mergeSort(data,temp,mid+1,r); Q7_#k66gb7
for(int i=l;i<=r;i++){ Zig3WiD&
temp=data; +XAM2uN5_.
} fwSI"cfM
int i1=l; RA}Y$ }^#'
int i2=mid+1; [pz1f!Wn
for(int cur=l;cur<=r;cur++){ v"dl6%D"
if(i1==mid+1) B
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data[cur]=temp[i2++]; US&:UzI.
else if(i2>r) }sM_^&e4X
data[cur]=temp[i1++]; >~uKkQ_p
else if(temp[i1] data[cur]=temp[i1++]; ! ~+mf^D
else O>IG7Ujl
data[cur]=temp[i2++]; y7LM}dH#m
} LHs^Xo18
} _!k\~4U
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} DS7Pioa86
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改进后的归并排序: R".*dC,0'B
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package org.rut.util.algorithm.support; Kk>va->R
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import org.rut.util.algorithm.SortUtil; =!=DISPo
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/** sbV_h;<
* @author treeroot g8]$BhRIfr
* @since 2006-2-2 BWzo|isv
* @version 1.0 GX N:=
*/ Z
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public class ImprovedMergeSort implements SortUtil.Sort { >n5Kz]]%
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private static final int THRESHOLD = 10; /Mw0<#
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/* C{YTHNn
* (non-Javadoc) :(i=> ~O
* XZxzw*Y1J
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Wbi12{C
*/ ^F-AZP
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public void sort(int[] data) { <#lNi.?.
int[] temp=new int[data.length]; 6^TWY[z2%
mergeSort(data,temp,0,data.length-1); dbfI!4
} Cp#}x1{
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private void mergeSort(int[] data, int[] temp, int l, int r) { E\VKlu4
int i, j, k; .WlZT-
int mid = (l + r) / 2; MwWN;_#EO)
if (l == r) NZuylQ)0
return; ":L d}~>
if ((mid - l) >= THRESHOLD) r,ep{
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mergeSort(data, temp, l, mid); 2&:nHZ)
else Rc~63![O.
insertSort(data, l, mid - l + 1); ,772$7x
if ((r - mid) > THRESHOLD) "=UhTE
mergeSort(data, temp, mid + 1, r); |w.5*]?H
else +\Je
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insertSort(data, mid + 1, r - mid); _x<7^^VT
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for (i = l; i <= mid; i++) { kQ .3J.Q5
temp = data; !D9V9p
} =]-D_$S~
for (j = 1; j <= r - mid; j++) { MQVEO5
temp[r - j + 1] = data[j + mid]; W 6CNMI]
} !H`uN
int a = temp[l]; cB7'>L
int b = temp[r]; UeaHH]U
for (i = l, j = r, k = l; k <= r; k++) { _%<qZT
if (a < b) { @&2#kO~=
data[k] = temp[i++]; (?z"_\^n/
a = temp; yj
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} else { O2Tna<cR&
data[k] = temp[j--]; I0OfK3!^
b = temp[j]; -aIB_
} hFDo{yI
} <2fvEW/#v
} i$z*~SuM#
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/** Yu|L6#[E
* @param data S[RVk=A1
* @param l 8&v%>wxR@
* @param i {Pe+d3Eoo
*/ <is%lx(GDX
private void insertSort(int[] data, int start, int len) { Bmi9U
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); b IZi3GmRF
} 2%@<A
} @;{iCVW
} g;!,2,De}
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}