归并排序: PQp/&D4K
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package org.rut.util.algorithm.support; <@P. 'rE
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import org.rut.util.algorithm.SortUtil; xkv%4H>
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/** .f"1(J8
* @author treeroot [S1 b\f#
* @since 2006-2-2 V>/,&~0
* @version 1.0 vn!5@""T
*/ hQ'W7EF
public class MergeSort implements SortUtil.Sort{ ]|tR8`DGZ%
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/* (non-Javadoc) h,n}=g+?
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) .+kg1=s
*/ S`$%C=a.
public void sort(int[] data) { 4XAs^>N+
int[] temp=new int[data.length]; V0BT./ B\<
mergeSort(data,temp,0,data.length-1); lV$CBS
} )K$YL='kX
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private void mergeSort(int[] data,int[] temp,int l,int r){ Q-rG~O9-
int mid=(l+r)/2; g9fYt&
if(l==r) return ; \Y>b#*m(4
mergeSort(data,temp,l,mid); D<|$ZuB4
mergeSort(data,temp,mid+1,r); b3F KDm[
for(int i=l;i<=r;i++){ R:$E'PSx
temp=data; b
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} ~(8f Uob
int i1=l; >lKu[nq;
int i2=mid+1; d%. |MAE
for(int cur=l;cur<=r;cur++){ E- [Eg
if(i1==mid+1) A*~G[KC3(
data[cur]=temp[i2++]; n_Qua|R
else if(i2>r) Tgax ZW
data[cur]=temp[i1++]; Je,o(:
else if(temp[i1] data[cur]=temp[i1++]; ]YtN6Rq/
else ]tf`[bINP
data[cur]=temp[i2++]; ?dbSm3
} J/Lf(;C_
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改进后的归并排序: 0KTO)K
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package org.rut.util.algorithm.support; /Ry%K4$
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import org.rut.util.algorithm.SortUtil; vbn=ywz
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/** l5.k2{'
* @author treeroot DxwR&S{
* @since 2006-2-2 &bz% @p;
* @version 1.0 }I-nT!D'y
*/ 3}!u8,P
public class ImprovedMergeSort implements SortUtil.Sort { "w%:5~u9
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private static final int THRESHOLD = 10; ;N?(R\*8
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/* &+&@;2
* (non-Javadoc) LRts
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* !^&VZh
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 9:Oz-b
*/ f}"eN/T
public void sort(int[] data) { 3>^]r jFw
int[] temp=new int[data.length]; Y!_{:2H8p
mergeSort(data,temp,0,data.length-1); PPH;'!>s"
} / Ws>;0
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private void mergeSort(int[] data, int[] temp, int l, int r) { y: x<`E=
int i, j, k; W#~7X
int mid = (l + r) / 2; kl]MP}wc
if (l == r) '~Cn+xf4]
return; )v_v 7 ~H&
if ((mid - l) >= THRESHOLD) tT>LOI_z
mergeSort(data, temp, l, mid); %4),P(4N
else YI
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insertSort(data, l, mid - l + 1); eA86~M?<o
if ((r - mid) > THRESHOLD) Rx&O}>"E>l
mergeSort(data, temp, mid + 1, r); Er%&y
else Y(bB7tR
insertSort(data, mid + 1, r - mid); r'j88)^
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for (i = l; i <= mid; i++) { \fUX_0k9,
temp = data; nAWb9Yk
} n0T|U
for (j = 1; j <= r - mid; j++) { 1P(=0\P>&
temp[r - j + 1] = data[j + mid]; @B(oq1i@
} 8T9s:/%
int a = temp[l]; Bh'fkW3
int b = temp[r]; @,GL&$Y:W
for (i = l, j = r, k = l; k <= r; k++) { :>JfBJ]|
if (a < b) { P*BRebL:
data[k] = temp[i++]; n)"JMzjQ<
a = temp; -f&vH_eK
} else { !5(DU~S*@S
data[k] = temp[j--]; 4pf@.ra,
b = temp[j];
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} d}zh.O5P!
} w(&EZDe
} \.}T_,I
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/** wR@>U.XT@
* @param data YB7n}r23
* @param l %L* EB;nK
* @param i RW+u5Y
*/ I51]+gEN
private void insertSort(int[] data, int start, int len) { $uDgBZA\
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); p$9Aadi]
} / Qd` ?
} 6vsA8u(|V#
} eZAMV/]jH
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}