归并排序: bTs2$81[
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package org.rut.util.algorithm.support; !t% 1G.
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import org.rut.util.algorithm.SortUtil; yQJ0",w3o.
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/** `E~"T0RX
* @author treeroot GcM1*)$ 4
* @since 2006-2-2 :tWkK$
* @version 1.0 &dB@n15'A
*/ xM())Z|2
public class MergeSort implements SortUtil.Sort{ "rdpA[>L
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/* (non-Javadoc) )xp3
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) /qdv zv%T
*/ WUS%4LL(
public void sort(int[] data) { _'p/8K5)=
int[] temp=new int[data.length]; =CzGI|pb
mergeSort(data,temp,0,data.length-1); T
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} |AvPg
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private void mergeSort(int[] data,int[] temp,int l,int r){ k$=L&id
int mid=(l+r)/2; le:}MM
if(l==r) return ; R3g)LnN
mergeSort(data,temp,l,mid); >VhZv75
mergeSort(data,temp,mid+1,r); B4 bB`r
for(int i=l;i<=r;i++){ u<j;+-]8h
temp=data; <*vR_?!
} F`KXG$
int i1=l; KKwM\
int i2=mid+1; VjM/'V5
for(int cur=l;cur<=r;cur++){ JCH9~n.
if(i1==mid+1) UV(`.
data[cur]=temp[i2++]; x@X2r
else if(i2>r) h<L_ =)lH
data[cur]=temp[i1++]; [C!*7h
else if(temp[i1] data[cur]=temp[i1++]; "Lvk?k
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else E}Cz(5
data[cur]=temp[i2++]; [kJ;Uxncz~
} 0 Rb3|te
} "yymnIQ3u
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} Az8b_:=
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改进后的归并排序: gpq ,rOIK
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package org.rut.util.algorithm.support; KXZG42w
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import org.rut.util.algorithm.SortUtil; <hzHrx'o{
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/** Dx\~#$S!=
* @author treeroot f0eQq;D$K
* @since 2006-2-2 PE.UNo>o
* @version 1.0 S))B^).0-
*/ *vQ 6LF;y
public class ImprovedMergeSort implements SortUtil.Sort { =pzTB-G
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private static final int THRESHOLD = 10; J"#6m&R_q
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/* rHk(@T.]
* (non-Javadoc) ~LI }
* A}! A*z<9
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) L@RnLaoQ
*/ &%v*%{|j
public void sort(int[] data) { sc t3|H#
int[] temp=new int[data.length]; WiZkIZ
mergeSort(data,temp,0,data.length-1); 46M=R-7=
} em7L`,
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private void mergeSort(int[] data, int[] temp, int l, int r) { M19O^P>[
int i, j, k; 0aq{Y7sYU
int mid = (l + r) / 2; J+CGhk
if (l == r) N9ipw r'P
return; 8-gl$h
if ((mid - l) >= THRESHOLD) 6r^ZMW
mergeSort(data, temp, l, mid); o>*`wv
else FoE}j
insertSort(data, l, mid - l + 1); %cs"PS
if ((r - mid) > THRESHOLD) J3+qnT8X
mergeSort(data, temp, mid + 1, r); ,1~B7Zd
else ((?"2 }1r
insertSort(data, mid + 1, r - mid); TlO=dLR7d
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for (i = l; i <= mid; i++) { irh Z
temp = data; P:J|![
} } A6z%|d
for (j = 1; j <= r - mid; j++) { m5/]+xdNX
temp[r - j + 1] = data[j + mid]; 3]iw3M
} f7zB_hVDmE
int a = temp[l]; o^5UHFxTCB
int b = temp[r]; g[y&GCKY!=
for (i = l, j = r, k = l; k <= r; k++) {
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if (a < b) { @@a#DjE%/
data[k] = temp[i++]; ,nog6\
a = temp; 5k=04=Iyh#
} else { G(A7=8vW
data[k] = temp[j--]; Y8}y0]V
b = temp[j]; p Dg!Cs
} io"NqR#"v
} zp4@T)
} ;B<rw^h5
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/** Ur[ai6LNG
* @param data '?90e4x3/
* @param l {OQ)Np!
* @param i uR=*q a
*/ N f?\O@
private void insertSort(int[] data, int start, int len) { s!W{ru
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); {y|.y~vW
} f% 8n?f3;u
} Dd
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} 8\)4waz$
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}