归并排序: -oD,F
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package org.rut.util.algorithm.support;
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import org.rut.util.algorithm.SortUtil; whI{?NP
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/** $C16}^
* @author treeroot N,t9X7G&
* @since 2006-2-2 m l`xLZN>L
* @version 1.0 UG1<Xfu|
*/ ,f03TBD}
public class MergeSort implements SortUtil.Sort{ PZ[-a-p40
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/* (non-Javadoc) Khq\@`RaT
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) OjU{r N*
*/ ]l7W5$26 @
public void sort(int[] data) { #%,X),%-
int[] temp=new int[data.length]; SA,~q&
mergeSort(data,temp,0,data.length-1); IPot][ N>
} tX*@r
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private void mergeSort(int[] data,int[] temp,int l,int r){ UlXm4\@
int mid=(l+r)/2; *i#2>=)
if(l==r) return ; Zy0M\-Mn
mergeSort(data,temp,l,mid); So5/n7
mergeSort(data,temp,mid+1,r); !&)X5oJ
for(int i=l;i<=r;i++){ " <bjS
temp=data; ]+lT*6P*
} 8lQ/cGAc
int i1=l; hzD)yf
int i2=mid+1; a %go[_w
for(int cur=l;cur<=r;cur++){ }gSoBu
if(i1==mid+1) *oO%+6nL
data[cur]=temp[i2++]; t Cuvb
else if(i2>r) N'1I6e"
data[cur]=temp[i1++]; *0U#Z]t
else if(temp[i1] data[cur]=temp[i1++]; L F?/60
else zD_5TGM=
data[cur]=temp[i2++]; =lNW1J\SW
} V[ UOlJ
} @Z]0c=-+
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改进后的归并排序: )L<.;`g4x
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package org.rut.util.algorithm.support; I0-1Hr
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import org.rut.util.algorithm.SortUtil; L5hF-Ek!
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/** %Tp9GGt
* @author treeroot #rHMf%0
* @since 2006-2-2 ^Ks1[xc* `
* @version 1.0 @`.4"*@M
*/ 0+&WIs
public class ImprovedMergeSort implements SortUtil.Sort {
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private static final int THRESHOLD = 10; k?cX fj&
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/* }0~$^J
* (non-Javadoc) /fQcrd7h
*
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 6O4*OR<&
*/ iBE|6+g~Cj
public void sort(int[] data) { 4DIU7#GG
int[] temp=new int[data.length]; AFt- V
mergeSort(data,temp,0,data.length-1); V``|<`!gd
} 8%4;'[UV
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private void mergeSort(int[] data, int[] temp, int l, int r) { 5%'ybh)@
int i, j, k; 74_?@Z(
int mid = (l + r) / 2; s$y_(oU,D
if (l == r) 4'faE="1)S
return; `JIp$
if ((mid - l) >= THRESHOLD) 9G6)ja?W
mergeSort(data, temp, l, mid); H c/7x).
else e`Yj}i*bx]
insertSort(data, l, mid - l + 1); h!B{7J
if ((r - mid) > THRESHOLD) _0[z
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mergeSort(data, temp, mid + 1, r); NK-}[!f
else v9T3=
insertSort(data, mid + 1, r - mid); 9^^\Z5
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for (i = l; i <= mid; i++) { B"v*[p?
temp = data; i7RK*{
} R0M>'V?e
for (j = 1; j <= r - mid; j++) { O!PGZuF
temp[r - j + 1] = data[j + mid]; HOD?i_
} pIIp61=$
int a = temp[l]; =K@LEZZ'/<
int b = temp[r]; Vc\g"1x
for (i = l, j = r, k = l; k <= r; k++) { clDn=k<
if (a < b) { mjOxmwo
data[k] = temp[i++]; ->#wDL!6
a = temp; sta/i?n
} else { s-#@t
data[k] = temp[j--]; MdX4Rp'
b = temp[j]; mB2}(DbhE
} Rd(8j+Q?ps
} [KUkv
} Wv>`x?W
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/** <\*)YKjn/@
* @param data {9J|\Zz3
* @param l 28JVW3&)
* @param i s=$xnc}mf
*/ 2?(/$F9X,
private void insertSort(int[] data, int start, int len) { $d1ow#ROgy
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); xpZ@DK;
} l>jrY1u
} UXZ3~/L5 O
} 9f['TG,"
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}