归并排序: Cp(2]Eb
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package org.rut.util.algorithm.support; Inv`C,$7Q#
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import org.rut.util.algorithm.SortUtil; Cl`i|cF\
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/** c%C6d97q
* @author treeroot >i,_qe?V:w
* @since 2006-2-2 1*9.K'
* @version 1.0 &K\80wGK
*/ :${tts2g
public class MergeSort implements SortUtil.Sort{ #G77q$
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/* (non-Javadoc) vUJ;D
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 8Rwk
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*/ u*G<?
public void sort(int[] data) { a&x:_vv
int[] temp=new int[data.length]; )^ Y+Vn
mergeSort(data,temp,0,data.length-1); az6&
} Zt!A!Afu
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private void mergeSort(int[] data,int[] temp,int l,int r){ Fs( PVN
int mid=(l+r)/2; Z-Qp9G'
if(l==r) return ;
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mergeSort(data,temp,l,mid); e4YP$}_L
mergeSort(data,temp,mid+1,r); QM F
for(int i=l;i<=r;i++){ nf0u:M"fm
temp=data; L"|Bm{Run
} )pH+ibR
int i1=l; m4 (pMrJ
int i2=mid+1; n?.; *:
for(int cur=l;cur<=r;cur++){ W~/d2_|/
if(i1==mid+1) CpO_p%P
data[cur]=temp[i2++]; aX^T[
else if(i2>r) Zk%@GOu\
data[cur]=temp[i1++]; x/umwT,o v
else if(temp[i1] data[cur]=temp[i1++]; `y3'v]
else :J`@@H
data[cur]=temp[i2++]; Wr%ov6:
} J+`aj8_ B
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改进后的归并排序: =EP`,zqn$9
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package org.rut.util.algorithm.support; c4Zpt%:}h
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import org.rut.util.algorithm.SortUtil; jr4xh{Z`
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/** y("WnVI
* @author treeroot ;>v.(0FE6
* @since 2006-2-2 /h0bBP
* @version 1.0 k{SGbC1=VK
*/ f1MRmp-f'
public class ImprovedMergeSort implements SortUtil.Sort { TVD~Ix
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private static final int THRESHOLD = 10; 'dwT&v]@
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/* %+(AKZu:
* (non-Javadoc) B$_4ul\)
* ,x8;| o5
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) I9S;t_Z<
*/ OOqT 0wN
public void sort(int[] data) { J:m/s9r
int[] temp=new int[data.length]; JXK\mah
mergeSort(data,temp,0,data.length-1); X&pYLm72;
} #{8IFA
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private void mergeSort(int[] data, int[] temp, int l, int r) { EL?(D
int i, j, k; " CT}34l
int mid = (l + r) / 2; N-M.O:p
if (l == r) Tn}`VW~
return; 6h;(b2p{
if ((mid - l) >= THRESHOLD) 8)X9abC
mergeSort(data, temp, l, mid); t )zd'[
else 6{y7e L3!
insertSort(data, l, mid - l + 1); zuvPV{
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if ((r - mid) > THRESHOLD) ~=|}!A(
mergeSort(data, temp, mid + 1, r); N)X Tmh2v|
else '47
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insertSort(data, mid + 1, r - mid); !g|O.mt
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for (i = l; i <= mid; i++) { UX)GA[WI
temp = data; ,Xn2xOP
} n%&L&G
for (j = 1; j <= r - mid; j++) { Ay16/7h@hi
temp[r - j + 1] = data[j + mid]; p R'J4~
}
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int a = temp[l]; X.fVbePxUU
int b = temp[r]; @t9HRL?T~
for (i = l, j = r, k = l; k <= r; k++) {
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if (a < b) { }iUK`e
data[k] = temp[i++]; Y !<m8\
a = temp; W{}$c`,R
} else { E]@&<TFq
data[k] = temp[j--]; +F;2FD$
b = temp[j]; "\b>JV5
} RQ,#TbAe
} 7rjl-FUA~
} :;+!ID_
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/** *
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* @param data d51lTGH7Z
* @param l <Vhd4c
* @param i G^c,i5}w
*/ W0gS>L_
private void insertSort(int[] data, int start, int len) { I=0c\ U}
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); \OwF!~&
} Q|(}rIWOQA
} *7!MG
} Xh@K89`uX
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}