归并排序: EQ j2:9f
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package org.rut.util.algorithm.support; I&e,R
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import org.rut.util.algorithm.SortUtil; 7Lr}Y/1=
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/** kOfu7Zj
* @author treeroot MO{6B#(<F
* @since 2006-2-2 Ij_VO{]G'l
* @version 1.0 B(GcPDj(K
*/ %DQ.f*%
public class MergeSort implements SortUtil.Sort{ @42!\1YT
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/* (non-Javadoc) a?IL6$z
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Bpjwc<U
*/ J@{yWgLg
public void sort(int[] data) { $cLtAo^W
int[] temp=new int[data.length]; Xja l6e)[
mergeSort(data,temp,0,data.length-1); aeESS;JxJj
} >o\[?QvP
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private void mergeSort(int[] data,int[] temp,int l,int r){ l/BE~gdl
int mid=(l+r)/2; U~SOHfZ%(
if(l==r) return ; =%:mZ@x'
mergeSort(data,temp,l,mid); }@pe`AF^
mergeSort(data,temp,mid+1,r); _J51:pi
for(int i=l;i<=r;i++){ HHbkR2H1
temp=data; L7jMpz&
} RoXU>a:nS
int i1=l; ; b2)WM:
int i2=mid+1; 9's/~T
for(int cur=l;cur<=r;cur++){ w@Pc7$EP
if(i1==mid+1) (YjY=F
data[cur]=temp[i2++]; .&ynS
else if(i2>r) h-1eDxK6
data[cur]=temp[i1++]; =sP6
else if(temp[i1] data[cur]=temp[i1++]; A#mf*]'
else R {r0dK"_
data[cur]=temp[i2++]; -IR9^)
} fN8|4
} 6 m5 \f
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改进后的归并排序: =;{vfjj
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package org.rut.util.algorithm.support; /Xi:k
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import org.rut.util.algorithm.SortUtil; @|&P#wd.u
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/** ;bd\XHwMUP
* @author treeroot 63QSYn,t
* @since 2006-2-2 a$I;
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* @version 1.0 $S$%avRX
*/ 39JLi~j,
public class ImprovedMergeSort implements SortUtil.Sort { ~ e[)]b3
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private static final int THRESHOLD = 10; bQk5R._got
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/* ?-O(EY1E
* (non-Javadoc) ^/HE_keY
* 7581G$@ym
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) RIUJ20PfYQ
*/ :yvUHx
public void sort(int[] data) { S<Q6b_D
int[] temp=new int[data.length]; >P5 EW!d
mergeSort(data,temp,0,data.length-1); Dyp'a
} -aGv#!aIl
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private void mergeSort(int[] data, int[] temp, int l, int r) { YTq>K/
int i, j, k; uH]n/Kv1,
int mid = (l + r) / 2; o([+Pp
if (l == r) s&vOwPmV
return; hHoc7
if ((mid - l) >= THRESHOLD) #]I:}Q51
mergeSort(data, temp, l, mid); B$Jn|J"/6
else 9VIsLk54^
insertSort(data, l, mid - l + 1); ;W#G<M&n'
if ((r - mid) > THRESHOLD) x>5#@SX
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mergeSort(data, temp, mid + 1, r); Hux#v>e
else 8T
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insertSort(data, mid + 1, r - mid); 3}$L4U
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for (i = l; i <= mid; i++) { XH)MBr@Fz
temp = data; iD@2_m)
} SsafRK$
for (j = 1; j <= r - mid; j++) { W.o
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temp[r - j + 1] = data[j + mid]; PG)dIec
} z@VY s
int a = temp[l]; A1\;6W:
int b = temp[r]; K^H=E
for (i = l, j = r, k = l; k <= r; k++) { +98~OInySZ
if (a < b) { [kz<2P
data[k] = temp[i++]; /NLpk7r[\q
a = temp; sl%B-;@I
} else { \C*?a0!:Z}
data[k] = temp[j--]; H5/%"1Q
b = temp[j]; O>w$
} 2N(c&Dzkh`
} t,R5FoV
} )T?w,"kI
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/** k$o6~u 2&
* @param data vC\]7]mC
* @param l b#k$/A@
* @param i tA@#SIw
*/ -CY?~WL&
private void insertSort(int[] data, int start, int len) { .he%a3e
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); X>F/0/
} sBF}j.b
} ImklM7A
} yYWGM
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}