归并排序: Reo0ZU>
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package org.rut.util.algorithm.support; vZsVxx99
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import org.rut.util.algorithm.SortUtil; $T0[
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/** \x}UjHYIc&
* @author treeroot 'z:p8"h}
* @since 2006-2-2 > kT~X ,o
* @version 1.0 3dLz=.=)'
*/ *WG}K?"/
public class MergeSort implements SortUtil.Sort{ Qa+gtGtJ
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/* (non-Javadoc) l|{<!7a
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) O'(vs"eN
*/ 4 vphLAm
public void sort(int[] data) { m~A/.t%=
int[] temp=new int[data.length]; &rubA
mergeSort(data,temp,0,data.length-1); =G :H)i
} |Sq>uC)
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private void mergeSort(int[] data,int[] temp,int l,int r){ e^QOn
int mid=(l+r)/2; q)X&S*-<o~
if(l==r) return ; I5,Fh>
mergeSort(data,temp,l,mid); QNY{pk
mergeSort(data,temp,mid+1,r); +Gko[<
for(int i=l;i<=r;i++){ &XP 0
temp=data; $9/r*@bu8d
} Uan;}X7@
int i1=l; \T?O.
int i2=mid+1; {H74`-C)W
for(int cur=l;cur<=r;cur++){ @B6[RZ R
if(i1==mid+1) v)06`G
data[cur]=temp[i2++]; e[n>U@
else if(i2>r) R0WJdW#
data[cur]=temp[i1++]; 5h&8!!$[
else if(temp[i1] data[cur]=temp[i1++]; t@\0$V
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else R\^tr
data[cur]=temp[i2++]; l;4F,iI
} pH%K4bV)8
} 'E9jv4E$n
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} n"JrjvS
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改进后的归并排序: G+ToZ&f@
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package org.rut.util.algorithm.support; qXW5_iX
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import org.rut.util.algorithm.SortUtil; Rs dACP
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/** 01J.XfCd6
* @author treeroot X!m/I
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* @since 2006-2-2 Kxq~,g=t
* @version 1.0 AbB%osz}Ed
*/ BN=,>-O%
public class ImprovedMergeSort implements SortUtil.Sort { `k+k&t
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private static final int THRESHOLD = 10; Lt)t}0
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/* (Q@+W|~
* (non-Javadoc) TSOt$7-
* QS[%`-dR2
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) MxY CMe4S[
*/ _.j KcDf
public void sort(int[] data) { 2axH8ONMu
int[] temp=new int[data.length]; )gE:@3
mergeSort(data,temp,0,data.length-1); VGSe<6Hh
} u{si
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private void mergeSort(int[] data, int[] temp, int l, int r) { |
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int i, j, k; LWY`J0/
int mid = (l + r) / 2; Kh27[@s
if (l == r) f@yST z;u
return; ?O.&=im_
if ((mid - l) >= THRESHOLD) 6d_l[N
mergeSort(data, temp, l, mid); _vad>-=D*U
else r8mE
insertSort(data, l, mid - l + 1); # H4dmnV
if ((r - mid) > THRESHOLD) :g Ze>
mergeSort(data, temp, mid + 1, r); pJ{sBp_$
else 419t"1b
insertSort(data, mid + 1, r - mid); U!('`TYe
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for (i = l; i <= mid; i++) { D.RHvo~6
temp = data; )+{'p0
} ~(}zp<e|
for (j = 1; j <= r - mid; j++) { Q?vGg{>
temp[r - j + 1] = data[j + mid]; gbF.Q7?$u
} na <g
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int a = temp[l]; <.Pr+g
int b = temp[r]; t.NG]ejZ
for (i = l, j = r, k = l; k <= r; k++) { klPc l[.w
if (a < b) { Q|:\
data[k] = temp[i++]; 3dXyKi
a = temp; 4%B${zP(.}
} else { _,5(HETE2
data[k] = temp[j--]; o#G7gzw)
b = temp[j]; 9^`G `D
} * ,,D%L
} ,rQznE1e
} zL1H[}[z+
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/** --y.q~d
* @param data yt$V<8a
* @param l y!!p:3
* @param i Si!W@Jm
*/ |Zz3X
private void insertSort(int[] data, int start, int len) { ^oM*f{9
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 9;kWuP>k4u
} }*;Hhbox
} ?mnwD ]u
} .BZw7
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}