归并排序: >=G;rs
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package org.rut.util.algorithm.support; FO<PMK
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import org.rut.util.algorithm.SortUtil; J/mLmSx
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/** )\s{\u
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* @author treeroot C< 3`]l
* @since 2006-2-2 M4w,J2_8MK
* @version 1.0 F{WV}o=MY
*/ r5M {*
public class MergeSort implements SortUtil.Sort{ }^+E S^~
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/* (non-Javadoc) w
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Za_w@o
*/ _ I"}3*
public void sort(int[] data) { ,bzE`6
int[] temp=new int[data.length]; s1.EE|h,5
mergeSort(data,temp,0,data.length-1);
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} Hb55RilC
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private void mergeSort(int[] data,int[] temp,int l,int r){ -N
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int mid=(l+r)/2; & Xm!i(i
if(l==r) return ; <'N"GLJ
mergeSort(data,temp,l,mid); }$iKz*nx|
mergeSort(data,temp,mid+1,r); mhVdsa
for(int i=l;i<=r;i++){ [1nfSW
temp=data; $ @g\wz
} d0``:
int i1=l; S3 12#X(%
int i2=mid+1; (yA`h@@WS
for(int cur=l;cur<=r;cur++){ \e+h">`WgX
if(i1==mid+1) /*Iq,"kGz
data[cur]=temp[i2++]; c|RTP
else if(i2>r) Of0(.-Q w
data[cur]=temp[i1++]; x7J8z\b"O
else if(temp[i1] data[cur]=temp[i1++]; B6ee\23
else C$WUg<kcK'
data[cur]=temp[i2++]; KG<. s<
} =hFIH\x
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改进后的归并排序: VJbsM1y M
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package org.rut.util.algorithm.support; y/i{6P2`,D
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import org.rut.util.algorithm.SortUtil; X!,huB^i
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/** j/ [V<
* @author treeroot f|f)Kys%5
* @since 2006-2-2 !aQb
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* @version 1.0 AS4mJ UU9
*/ Lmsc~~
public class ImprovedMergeSort implements SortUtil.Sort { 8]h~jNku
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private static final int THRESHOLD = 10; #1fL2nlP*E
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/* &_cH9zw@
* (non-Javadoc) HOt,G
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* UOIB}ut
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 56w uk
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*/ qofD@\-
public void sort(int[] data) { QNbV=*F?
int[] temp=new int[data.length]; . n[;H;
mergeSort(data,temp,0,data.length-1); bT>MZK8b
} mqj]=Fq*
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private void mergeSort(int[] data, int[] temp, int l, int r) { ?_ 476A
int i, j, k; ci
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int mid = (l + r) / 2;
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if (l == r) 0:I[;Qt
return; PH.g+u=v
if ((mid - l) >= THRESHOLD) ;gGq\c
mergeSort(data, temp, l, mid); or,:5Z
else FYs]I0}|
insertSort(data, l, mid - l + 1); =E.!Ff4~(
if ((r - mid) > THRESHOLD) MB7`'W
mergeSort(data, temp, mid + 1, r); {ty)2
else .jUM';
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insertSort(data, mid + 1, r - mid); 9Js+*,t
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for (i = l; i <= mid; i++) { :a/l9 m(
temp = data; ONVhB
} 3_bqDhVI5
for (j = 1; j <= r - mid; j++) { hsB3zqotF
temp[r - j + 1] = data[j + mid]; `%A vn<
} R_W6}
int a = temp[l]; :W^\ }UX4
int b = temp[r]; |
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for (i = l, j = r, k = l; k <= r; k++) { 1-V"uLy@gC
if (a < b) { JR_%v=n~x
data[k] = temp[i++]; !mZDukfjQ
a = temp; S86,m=
} else { `L
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data[k] = temp[j--]; .af+h<RG4$
b = temp[j]; }7*|s+F(f
} 'B:8tv
} (/7b8)g
} qxB|*P`
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/** 2##;[
* @param data +=:_a$98
* @param l `>0%Ha
* @param i 577#A, O
*/ Yt[LIn-v:
private void insertSort(int[] data, int start, int len) { 4#qZ`H,Ur)
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); !>\&*h-Cm#
} 5^D094J|^
} ZIN1y;dJ
} nll=Vd[
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}