归并排序: ;P;-}u
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package org.rut.util.algorithm.support; $Oq^jUJ
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import org.rut.util.algorithm.SortUtil; j`oy`78O
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/** rw: c
* @author treeroot $RYa6"`
* @since 2006-2-2 FR$:"
* @version 1.0 OPwtV9%
*/ Z?}dq-Vh&
public class MergeSort implements SortUtil.Sort{ 'w!Cn>
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/* (non-Javadoc) Qi^Z11
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) <L`KzaA
*/ jB`,u|FG
public void sort(int[] data) { AB=daie
int[] temp=new int[data.length]; ;LcVr13J/
mergeSort(data,temp,0,data.length-1); +s(HOq)b
} ?sab*$wG
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private void mergeSort(int[] data,int[] temp,int l,int r){ oT^{b\XN
int mid=(l+r)/2; 5XO;N s
if(l==r) return ; Q7*SE%H
mergeSort(data,temp,l,mid); YX=a#%vrl
mergeSort(data,temp,mid+1,r); @GkILFN
for(int i=l;i<=r;i++){ u&`XB|~
temp=data; >CrA;\l
} d_CKP"TA
int i1=l; 0>C T=(A
int i2=mid+1; 0C1pt5K
for(int cur=l;cur<=r;cur++){ " |Xk2U
if(i1==mid+1) Gnf~u[T6
data[cur]=temp[i2++]; }#.L7SIJ<J
else if(i2>r) }B8IBveu
data[cur]=temp[i1++]; kB3H="3[[
else if(temp[i1] data[cur]=temp[i1++]; Rd2qe /
else 4^TG>j?M
data[cur]=temp[i2++]; L_vISy%\b
} >Nvjl~o5
} s1=X>'q
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} [p{#XwN
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改进后的归并排序: {/"2Vk<H8
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package org.rut.util.algorithm.support; )#P;
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import org.rut.util.algorithm.SortUtil; L0*nm.1X
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/** wLmhy,
* @author treeroot QcgRAo+u
* @since 2006-2-2 {aY%gk?y#>
* @version 1.0 GKOD/,
*/ M\sN@+
public class ImprovedMergeSort implements SortUtil.Sort { eb.O#Y
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private static final int THRESHOLD = 10; ' qWALu
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/* K&nE_.kbl
* (non-Javadoc) v 0
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* n1JRDw"e$$
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) hn^<;av=
*/ sp#p8@Cj
public void sort(int[] data) { e}Cif2#d~
int[] temp=new int[data.length]; >ZPsjQuf"
mergeSort(data,temp,0,data.length-1); 9S-Z&2L
} PUF/#ck
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private void mergeSort(int[] data, int[] temp, int l, int r) { L$9.8W
int i, j, k; s~>d:'k7|
int mid = (l + r) / 2; \n{qsf:
if (l == r) {. 2k6_1[
return; <Fi%iA
if ((mid - l) >= THRESHOLD) @W vatD
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mergeSort(data, temp, l, mid); >=RmGS
else gg[WlRQK4A
insertSort(data, l, mid - l + 1); 9;_sC
if ((r - mid) > THRESHOLD) 1nQWW9i
mergeSort(data, temp, mid + 1, r); \Kl+ 5%L
else L[^9E'L$
insertSort(data, mid + 1, r - mid); {p;zuCF1
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for (i = l; i <= mid; i++) { lLp^Gt^}w(
temp = data; "$N#p5
} ;u;# g
for (j = 1; j <= r - mid; j++) { L{hnU7sY
temp[r - j + 1] = data[j + mid]; VTG9$rQZ
} vWRju*Z&
int a = temp[l]; WKT4D}{1
int b = temp[r]; `wus\&!W
for (i = l, j = r, k = l; k <= r; k++) { MOsl_^c
if (a < b) { fJ/e(t
data[k] = temp[i++]; ~MS\
a = temp; .#1~Rz1r
} else { R($KSui
data[k] = temp[j--]; jqv- D
b = temp[j]; Tsgk/e9K2?
} 4"{ooy^Q
} dE:+k/
} Pdt6nzfr
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/** D[^m{ 9_
* @param data ?%`@ub$
* @param l wS4.8iJ
* @param i BDq%'~/^
*/ Fb^:V4<T
private void insertSort(int[] data, int start, int len) { BlXB7q,
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); }RmU%IYc
} pcYG~pZ9
} c%&:6QniZ
} (>VX-Y/
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}