归并排序: Sed8Q-m
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package org.rut.util.algorithm.support; 3|!3R'g/ >
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import org.rut.util.algorithm.SortUtil; IuP~Vt{m
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/** uDND o
* @author treeroot mKu,7nMvF
* @since 2006-2-2 -BP10-V
* @version 1.0 Ms +ekY)
*/ $1 B?@~&
public class MergeSort implements SortUtil.Sort{ 0R? @JC
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/* (non-Javadoc) EUs9BJFP
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) :l"BNT[/
*/ U"/T`f'H z
public void sort(int[] data) { "Y^j=?1k
int[] temp=new int[data.length]; Zoxblk
mergeSort(data,temp,0,data.length-1); .`~?w+ ~
} tl /i
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private void mergeSort(int[] data,int[] temp,int l,int r){ YvN]7tcb
int mid=(l+r)/2; 'k]~Q{K$
if(l==r) return ; 9[JUJ,#X'0
mergeSort(data,temp,l,mid); ;=$;h6W0
mergeSort(data,temp,mid+1,r); st* sv}
for(int i=l;i<=r;i++){ !&Q?AS JH
temp=data; "P?O1
} 1#cTk
int i1=l; qE2VUEv5Y
int i2=mid+1; .s>@@m-
for(int cur=l;cur<=r;cur++){ bK!h{Rr
if(i1==mid+1) C_>XtcU
data[cur]=temp[i2++]; oh:9v+
else if(i2>r) @gbW:
data[cur]=temp[i1++]; IV!`~\@
else if(temp[i1] data[cur]=temp[i1++]; a9;KS>~bq
else [uGsF0#e
data[cur]=temp[i2++]; T8Mqu`$r
} c*7|>7C$i
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改进后的归并排序: YFS6YA
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package org.rut.util.algorithm.support; MvZa;B
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import org.rut.util.algorithm.SortUtil; BFw_T3}zn
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/** d'Bxi"K
* @author treeroot 8#JX#<HEo
* @since 2006-2-2 TW>GYGz
* @version 1.0 w!H(zjv&(
*/ 9vyf9QE;
public class ImprovedMergeSort implements SortUtil.Sort { UL}wGWaoG
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private static final int THRESHOLD = 10; 6d/Q"As
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/* ?ckV 2
* (non-Javadoc) b4dviYI
* Dfzj/spFV
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) J)n_u) ,
*/ 17?YN<
public void sort(int[] data) { UJh;Hp:
int[] temp=new int[data.length]; 1xEOYM)
mergeSort(data,temp,0,data.length-1); `dcz9 *
} }R16WY_'
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private void mergeSort(int[] data, int[] temp, int l, int r) { /;(ji?wN
int i, j, k; Ur]$@N
int mid = (l + r) / 2; v.<mrI#?
if (l == r) hT 1JEu
return; 'I/_vqp@
if ((mid - l) >= THRESHOLD) MZ$uWm`/
mergeSort(data, temp, l, mid); 5C1EdQ4S0
else (o IGp
insertSort(data, l, mid - l + 1); WtZI1`\qe
if ((r - mid) > THRESHOLD) 1N(1h
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mergeSort(data, temp, mid + 1, r); 8u~
else G`n
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insertSort(data, mid + 1, r - mid); -O\i^?lD;
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for (i = l; i <= mid; i++) { Rs5 lL-I
temp = data; \X&8EW
} % Q6
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for (j = 1; j <= r - mid; j++) { ?[Y(JO#
temp[r - j + 1] = data[j + mid]; Y&yfm/R u
} M\4`S&
int a = temp[l]; @~$"&B
int b = temp[r]; t?G6|3
for (i = l, j = r, k = l; k <= r; k++) { 2lsUCQI;
if (a < b) { Sp X;nH-D
data[k] = temp[i++]; WqF,\y%W*
a = temp; {,sqUq (
} else { AcuF0KWw/
data[k] = temp[j--]; ="YGR:
b = temp[j]; V>T?'GbS
} ~C%I'z'
} nI]EfHU
} :1UMA@HP
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/** O_1[KiZ
* @param data X8ap
* @param l z5$Q"Y.D
* @param i A`Dx]y
*/ :CE4<
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private void insertSort(int[] data, int start, int len) { KL=<s#
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); U&WEe`XM
} -%"PqA/1zj
} '+_>PBOc
} cw!,.o%cD
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}