归并排序: )W= O~g
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package org.rut.util.algorithm.support; NzAh3k
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import org.rut.util.algorithm.SortUtil; %GTFub0F
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/** (Yz[SK=U}
* @author treeroot HW]?%9a
* @since 2006-2-2 X<5fn+{]S:
* @version 1.0 /4O))}TX
*/ wU|@fm"
public class MergeSort implements SortUtil.Sort{ zG$5g^J
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/* (non-Javadoc) 6D
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) $B8Vg `+
*/ d<d3j9u(#
public void sort(int[] data) { inh:b .,B
int[] temp=new int[data.length]; dwk%!%
mergeSort(data,temp,0,data.length-1); ;N#}3lpLqg
} U',C-56z
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private void mergeSort(int[] data,int[] temp,int l,int r){ w:lj4Z_
int mid=(l+r)/2; :!MEBqcU
if(l==r) return ; uGz)Vz&3
mergeSort(data,temp,l,mid); T/E=?kBR
mergeSort(data,temp,mid+1,r); F%<*a,m6g
for(int i=l;i<=r;i++){ Zb2pZhkW
temp=data; M?YNK]
} PwW$=M{\.
int i1=l; }$z(?b
int i2=mid+1; 8Azh&c
for(int cur=l;cur<=r;cur++){ ~-Kx^3(#
if(i1==mid+1) vYm-$KQ"o
data[cur]=temp[i2++]; 1q(Qr
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else if(i2>r) F(n<:TvlK
data[cur]=temp[i1++]; 0?$|F0U"J
else if(temp[i1] data[cur]=temp[i1++]; 8OZasf
else WYb}SI(E
data[cur]=temp[i2++]; [3bPoAr\
} Uk] jy>7;!
} iO?AY
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} /%g9g_rt#
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改进后的归并排序: (Ff}Y.4
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package org.rut.util.algorithm.support; ('J@GTe@xj
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import org.rut.util.algorithm.SortUtil; D&pn@6bB
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/** l,hOnpm9
* @author treeroot >BO$tbU5b
* @since 2006-2-2 ya1
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* @version 1.0 1s(T#jh
*/ ,93Uji[l
public class ImprovedMergeSort implements SortUtil.Sort { OC*28)
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private static final int THRESHOLD = 10; l S,Jo/T@
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/* 2, )>F"R
* (non-Javadoc) 7qyPI
* ,B'=$PO%
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) dscah0T
*/ BJwuN
public void sort(int[] data) { uKAI->"
int[] temp=new int[data.length]; 9no<;1+j,
mergeSort(data,temp,0,data.length-1); _cQ
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} Zpg;hj5_
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private void mergeSort(int[] data, int[] temp, int l, int r) { Op-z"inw
int i, j, k; uX1;
int mid = (l + r) / 2; ,5v'hG
if (l == r) Ur#jJR@%3
return; A9b(P[!]T:
if ((mid - l) >= THRESHOLD) ^+D/59I
mergeSort(data, temp, l, mid); ,e43m=KhK
else ?d3K:|g
insertSort(data, l, mid - l + 1); ~Pw9[ycn3
if ((r - mid) > THRESHOLD) 3GF67]
mergeSort(data, temp, mid + 1, r); O8.xt|
else :rU.5(,
insertSort(data, mid + 1, r - mid); neM.M)0
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for (i = l; i <= mid; i++) { syBpF:`-W
temp = data; =!q]0#
} B`e/ /
for (j = 1; j <= r - mid; j++) { <VhmtT%7
temp[r - j + 1] = data[j + mid]; cxs@ph&Wk
} Qw2`@P8W
int a = temp[l]; xR0*w7YE
int b = temp[r]; UDr1t n
for (i = l, j = r, k = l; k <= r; k++) { pYQSn.`V~
if (a < b) { "O>~osj
data[k] = temp[i++]; bK%F_v3'
a = temp; dP_QkO
} else { ]|g2V
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data[k] = temp[j--]; 6d]4
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b = temp[j]; S. `y%t.GP
} Dst;sLr[,
} +h"i6`g
} y[$UeE"0
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/** CmBPCjh
* @param data 5Jo'h]
* @param l TNqL ')f
* @param i A^,ul>!
*/ I[&x-}w
private void insertSort(int[] data, int start, int len) { mbbhz,
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); Pr}
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} LmJjO:W}^y
} )q_,V"
} d~QKZ&jf
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}