归并排序: hV>4D&<
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package org.rut.util.algorithm.support; .XLV:6
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import org.rut.util.algorithm.SortUtil; 5}d/8tS
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/** 0,~6TV<K
* @author treeroot GOZQ5m
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* @since 2006-2-2 q(jkit~`A
* @version 1.0 vU8FHVytV
*/ 7i+!^Qj?y
public class MergeSort implements SortUtil.Sort{ M]4 =(Vv+5
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/* (non-Javadoc) =mi:<q
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) aX[1H6&=7
*/ x'=3&vc4
public void sort(int[] data) { P+;CE|J`X
int[] temp=new int[data.length]; *b6I%MZn
mergeSort(data,temp,0,data.length-1); _@BRpLs:4
} * Y%<b86U
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private void mergeSort(int[] data,int[] temp,int l,int r){ rt 3f7 s*
int mid=(l+r)/2; f- k|w%R@
if(l==r) return ; |Uy e>%*}4
mergeSort(data,temp,l,mid); 0U~;%N+lv
mergeSort(data,temp,mid+1,r); :!+}XT7)/
for(int i=l;i<=r;i++){ u^aFj%}]L
temp=data; n ,&/D
} ]e@0T{!
int i1=l; !e:iB7<
int i2=mid+1; {;Y 89&*R
for(int cur=l;cur<=r;cur++){ k"q!|+&Fs
if(i1==mid+1) E,<\T6/%q
data[cur]=temp[i2++]; .0Iun+nUD
else if(i2>r) L=
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data[cur]=temp[i1++]; S/nj5Lh
else if(temp[i1] data[cur]=temp[i1++]; +&7[lsD*
else RVgPH<1X@e
data[cur]=temp[i2++]; PkPDVv
} (<bm4MPf
} d%#!nq{vd
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} \uU=O
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改进后的归并排序: LC,*H0
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package org.rut.util.algorithm.support; ;0w ^ud
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import org.rut.util.algorithm.SortUtil; S'
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/** FGDGWcRw~
* @author treeroot (B_7\}v|_
* @since 2006-2-2 "EcX_>
* @version 1.0 |+Hp+9J
*/ &dhcKO<4
public class ImprovedMergeSort implements SortUtil.Sort { %Ycx C0S[
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private static final int THRESHOLD = 10; 93W
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/* y*VQ]aJ
* (non-Javadoc) KA 5~">l
* AW,v
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) v`#j
*/ ,:#,}w_HyO
public void sort(int[] data) { !US8aT
int[] temp=new int[data.length]; c;:">NR
mergeSort(data,temp,0,data.length-1); w(76H^e
} ID67?:%r
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private void mergeSort(int[] data, int[] temp, int l, int r) { v229H<
int i, j, k; _ztZ>'
int mid = (l + r) / 2; 0>,.c2),
if (l == r) ]{f^;y8
return; ==QWwPpA
if ((mid - l) >= THRESHOLD) N$\ bg|v
mergeSort(data, temp, l, mid); YCa@R!M*O
else *4<4
insertSort(data, l, mid - l + 1); 7d&DrI@~
if ((r - mid) > THRESHOLD) %
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mergeSort(data, temp, mid + 1, r); r\$6'+Si
else _iG2J&1'L
insertSort(data, mid + 1, r - mid); A6Ghj{~
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for (i = l; i <= mid; i++) { /y}"M
temp = data; T>}0) s
} Bk?8zYp
for (j = 1; j <= r - mid; j++) { +hE',i.
temp[r - j + 1] = data[j + mid]; bA}AD`5
} 3lo;^KX !
int a = temp[l]; 2\^G['9
int b = temp[r]; @Ii-NmOr
for (i = l, j = r, k = l; k <= r; k++) { XDPL;(?
if (a < b) { :P3{Nxa
data[k] = temp[i++]; K)\(wxv
a = temp; 4p.^'2m
} else { PG{i,xq_B{
data[k] = temp[j--]; ?b||Cr
b = temp[j]; =43I1&_
} D`6iDit
} s}6+8 fE"
} ze`1fO|%
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/** 6cM<>&e
* @param data \)ip>{WG
* @param l =96G8hlT
* @param i `E@kFJ(<On
*/ =M7TCE
private void insertSort(int[] data, int start, int len) { EXuLSzQwv
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); t/}L36@+
} 'It?wB W
} B[r<m J
} vxZg &SRK
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}