归并排序: v>.nL(VLjP
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package org.rut.util.algorithm.support; h=YY>
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import org.rut.util.algorithm.SortUtil; =| S8.|r+
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/** _ZIaEJjH/
* @author treeroot mN@)b+~(S
* @since 2006-2-2 C9x'yBDv
* @version 1.0 3lhXD_Y
*/ xeo;4c#S5
public class MergeSort implements SortUtil.Sort{ #*,Jqr2f
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/* (non-Javadoc) Pk[f_%0
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) C\dQ6(3}\
*/ jJ?MT#v
public void sort(int[] data) { FyJI@PZdI-
int[] temp=new int[data.length]; Mkko1T=6
mergeSort(data,temp,0,data.length-1); @)m[:n
} UP 1Y3
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private void mergeSort(int[] data,int[] temp,int l,int r){ UF=5k~7<b
int mid=(l+r)/2; 3=@7:4 A
if(l==r) return ; yEtI5Qk
mergeSort(data,temp,l,mid); r^_8y8&l
mergeSort(data,temp,mid+1,r); HD ?z
for(int i=l;i<=r;i++){ SG
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temp=data; t*zve,?}
} _s (0P*
int i1=l; gl:vJD
int i2=mid+1; IJx dbuKg
for(int cur=l;cur<=r;cur++){ -aLBj?N c[
if(i1==mid+1) HI#}M|4n
data[cur]=temp[i2++]; ch1EF/"
else if(i2>r) ./jkY7
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data[cur]=temp[i1++]; +cheLc
else if(temp[i1] data[cur]=temp[i1++]; ~xGWL%og
else HcUivC
data[cur]=temp[i2++]; 8|{:N>7
} X}0NeG^'O
} @jN!j*Y H
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} ?0hk~8c
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改进后的归并排序: l Vo](#W
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package org.rut.util.algorithm.support; FT/H~|Z>
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import org.rut.util.algorithm.SortUtil; idvEE6I@
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/** Q/\
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* @author treeroot IpGq_TU
* @since 2006-2-2 BRG1/f
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* @version 1.0 %Gl, V5z&
*/ ;"!dq)
public class ImprovedMergeSort implements SortUtil.Sort { 44f8Hc1g
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private static final int THRESHOLD = 10; 6=Kl[U0Y
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/* [WXtR
* (non-Javadoc) _ D1bR7
* ,[,+ _A
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) M
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*/ )J<Li!3
public void sort(int[] data) { QB#f'X
int[] temp=new int[data.length]; }h5pM`|1
mergeSort(data,temp,0,data.length-1); [esjR`u
} ETV|;>v
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private void mergeSort(int[] data, int[] temp, int l, int r) { {F6hx9?
int i, j, k; TGdD7n&Ehh
int mid = (l + r) / 2; Ko\m8\3?fK
if (l == r) 7~C@x+1S/
return; .=3Sm%
if ((mid - l) >= THRESHOLD) K7M7T5<
mergeSort(data, temp, l, mid); ScQJsFE6
else g % q7
insertSort(data, l, mid - l + 1); ppN96-]^0
if ((r - mid) > THRESHOLD) !9356) cV
mergeSort(data, temp, mid + 1, r); 6aK'%K
else }EE
insertSort(data, mid + 1, r - mid); LDBxw
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for (i = l; i <= mid; i++) { QKCc5
temp = data; jeN_
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} j,/OzVm9
for (j = 1; j <= r - mid; j++) { w:r0>
temp[r - j + 1] = data[j + mid]; J^hj
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} S-gL]r3G8
int a = temp[l]; vpvPRwJ
int b = temp[r]; aN).G1
for (i = l, j = r, k = l; k <= r; k++) { _MR|(mV
if (a < b) { @za?<G>!'e
data[k] = temp[i++]; +I/7eIG?|
a = temp; [Rs5hO
} else { j8M}*1
data[k] = temp[j--]; -x_b^)x~b7
b = temp[j]; ([_ls8
} @,CCwiF'q
} =4\|'V15
} o(]kI?`
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/** $ENA$
* @param data F&lWO!4
* @param l q!7z4Cn
* @param i 6?+bi\6
*/ LV0g *ng
private void insertSort(int[] data, int start, int len) { ZWG$MFEjl
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); ]d9;YVAU
} lD6hL8[
} oPk 2ac
} <uU AAHi
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}