归并排序: .5jnKU8NF
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package org.rut.util.algorithm.support; 8MYLXW6
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import org.rut.util.algorithm.SortUtil; X|lElN
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/** Fi,e}j=2f
* @author treeroot ,yB?~
* @since 2006-2-2 _mIa8K;
* @version 1.0 7eaA]y~H
*/ "z{_hp{T^
public class MergeSort implements SortUtil.Sort{ INN/VDsJ
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/* (non-Javadoc)
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) t z
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*/ =hZ&66
public void sort(int[] data) { o=QRgdPD
int[] temp=new int[data.length]; GY0XWUlC
mergeSort(data,temp,0,data.length-1); <wd4^Vr!2
} <Y}"D Yt
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private void mergeSort(int[] data,int[] temp,int l,int r){ =,/A\F
int mid=(l+r)/2; ]noP
if(l==r) return ; V8KTNt%
mergeSort(data,temp,l,mid); ^5FJ}MMJf
mergeSort(data,temp,mid+1,r); eCPKpVhP
for(int i=l;i<=r;i++){ 6\)8mK
temp=data; Q*mMF@-:
} Hm.&f2|(
int i1=l; +7lRP)1R
int i2=mid+1; 9 "
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for(int cur=l;cur<=r;cur++){ -6em*$k^
if(i1==mid+1) 8a":[Q[
data[cur]=temp[i2++]; 2heWE
else if(i2>r) c|R3,<Q]
data[cur]=temp[i1++]; s$DT.cvO
else if(temp[i1] data[cur]=temp[i1++]; (TbB?X}
else P&-D0T_
data[cur]=temp[i2++]; W=;(t
} NXWIE4T>*^
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改进后的归并排序: 69<rsp(p
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package org.rut.util.algorithm.support; >r4Y\"/j
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import org.rut.util.algorithm.SortUtil; "ojD f3@{
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/** $S)e"Po~5
* @author treeroot 2Xj-A\Oh~
* @since 2006-2-2 79c 9+
* @version 1.0 i-"h"nF"
*/ KoQ_:`
public class ImprovedMergeSort implements SortUtil.Sort { #LNB@E
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private static final int THRESHOLD = 10; z*k3q`=>
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/* Lct+cKKU
* (non-Javadoc) WX[dM
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* EJ
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ][$$
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*/ Zkb,v!l
public void sort(int[] data) { *i]Z=
int[] temp=new int[data.length]; abk:_
mergeSort(data,temp,0,data.length-1); 0wE8GmG
} Zs K'</7
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private void mergeSort(int[] data, int[] temp, int l, int r) { Nno={i1jk
int i, j, k; @}rfY9o'
int mid = (l + r) / 2; gu.))3D9
if (l == r) @ :
return; 4#Nd;gM2
if ((mid - l) >= THRESHOLD) 2Z1(J% 7
mergeSort(data, temp, l, mid); pcxl2I
else r'JK$9
insertSort(data, l, mid - l + 1); f.xSr!
if ((r - mid) > THRESHOLD) zZ"')+7q&%
mergeSort(data, temp, mid + 1, r); 1MzB?[gx
else [.#$hOsNR
insertSort(data, mid + 1, r - mid); ljR?* P
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for (i = l; i <= mid; i++) { _q!ck0_
temp = data; H(ftOd.y
} oO9iB:w
for (j = 1; j <= r - mid; j++) { +z/73s0~
temp[r - j + 1] = data[j + mid]; <h>fip3o
} #(}_2x5
int a = temp[l]; ,4I6Rw B.
int b = temp[r]; )UU6\2^
for (i = l, j = r, k = l; k <= r; k++) { 7&U+f:-w
if (a < b) { =|t1eSzc
data[k] = temp[i++]; Uc;IPS
a = temp; Cr\/<zy1-e
} else { R$'nWzX#
data[k] = temp[j--];
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b = temp[j]; ,T>2zSk
} o\YdL2:X
} $fpDABf
} nQ*oOxe|X
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/** .cK
* @param data ,UJPLj^
* @param l dufHd
* @param i 8pKPbi;(2
*/ BP><G^
private void insertSort(int[] data, int start, int len) { #Y b9w3N
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); jtC ob'n8
}
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} !f[N&se
} ^g"6p#S=n
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}