归并排序: Vg\EAs>f
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package org.rut.util.algorithm.support; QT9(s\u
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import org.rut.util.algorithm.SortUtil; so8isDC'9
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/** ~ra2Xyl
* @author treeroot +~ :1H.
* @since 2006-2-2 b,~4O~z
* @version 1.0 BGodrb1
*/ wP6~HiC
public class MergeSort implements SortUtil.Sort{ $oH?oD1
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/* (non-Javadoc) =JOupw
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) q3VE\&*^F
*/ OlRBvfoh8
public void sort(int[] data) { k^p|H:
int[] temp=new int[data.length]; MH 'S,^J
mergeSort(data,temp,0,data.length-1); 8K]fw{-$L
} ><TuL7+
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private void mergeSort(int[] data,int[] temp,int l,int r){ MH?|>6
int mid=(l+r)/2; PD$ay^Y
if(l==r) return ; V~&P<=8;Wl
mergeSort(data,temp,l,mid); hh{4r} |
mergeSort(data,temp,mid+1,r); G! zV=p
for(int i=l;i<=r;i++){ %TPnC'2
temp=data; Zu_m$Mx
} Dvo.yn|kB
int i1=l; P_z3TK
int i2=mid+1; zW!3>(L/
for(int cur=l;cur<=r;cur++){ 3 {\b/NL$
if(i1==mid+1) z62e4U][
data[cur]=temp[i2++]; 8QE0J$d5
else if(i2>r) sn+i[
data[cur]=temp[i1++]; :7e2O!zH_
else if(temp[i1] data[cur]=temp[i1++]; ;B^G<
else 7cK#fh"hvg
data[cur]=temp[i2++]; ]N:SB
} &%>l9~F'~
} 37v!:xF!
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} AVOzx00U
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改进后的归并排序: & *B@qQ
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package org.rut.util.algorithm.support; 8,a&i:C
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import org.rut.util.algorithm.SortUtil; 7F>5<Gv:-
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/** ,1Suq\
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* @author treeroot (NFq/w%
* @since 2006-2-2 q<@f3[A
* @version 1.0 \"V7O'S)&
*/
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public class ImprovedMergeSort implements SortUtil.Sort { kmi[u8iXD_
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private static final int THRESHOLD = 10; y"]?TEd
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/* e/6WhFN#
* (non-Javadoc) @rRBo:0%
* GLcf'$l
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) d?oupW}uu
*/ 1C{n!l
public void sort(int[] data) { y/$WjFj3"
int[] temp=new int[data.length]; !qV{OXdrB
mergeSort(data,temp,0,data.length-1); gLsl/G
} m[LIM}Gu
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private void mergeSort(int[] data, int[] temp, int l, int r) { *%:p01&+
int i, j, k; ZC_b`q<
int mid = (l + r) / 2; c;xL.
if (l == r) <dV|N$WV
return; VSx[{yn
if ((mid - l) >= THRESHOLD) 1U;je,)
mergeSort(data, temp, l, mid); e=o<yf9>Q
else \wCj$-;Jt
insertSort(data, l, mid - l + 1); >5%
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if ((r - mid) > THRESHOLD) e-ljwCD
mergeSort(data, temp, mid + 1, r); K,&)\r kzD
else ecA:y!N
insertSort(data, mid + 1, r - mid); g:dw%h
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for (i = l; i <= mid; i++) { `4'v)!?
temp = data; NN\% X3ri"
} lf4-Ci*X
for (j = 1; j <= r - mid; j++) { k_r12Bu
temp[r - j + 1] = data[j + mid]; pD9*WKEf*
} yc8iT`
int a = temp[l]; SuB;Nb7r`
int b = temp[r]; c_~)#F%P
for (i = l, j = r, k = l; k <= r; k++) { [uT&sZxmg
if (a < b) { Sqed*
data[k] = temp[i++]; Lp5LRw
a = temp; |P$tLOrG
} else { lE78Yl]
data[k] = temp[j--]; UA!-YTh
b = temp[j]; AY5%<CWj8
} .5 p"o-:D
} MH.,dB&
} 2oXsPrtZ
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/** r,(rWptf4
* @param data $iUK,
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* @param l rZLTai}`>
* @param i b2aPo M=
*/ "o*(i7T=n
private void insertSort(int[] data, int start, int len) { \zR@FOl`q
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); q{ItTvL
} S;kI\;
} &?"(al?
} Zgkk%3'^'
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}