归并排序: [> Q+=(l
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package org.rut.util.algorithm.support; :XqqhG
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import org.rut.util.algorithm.SortUtil; @@M
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/** J'jwRn
* @author treeroot BIqZg$
* @since 2006-2-2 TCWy^8LA
* @version 1.0 F
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*/ tJ;<=.n
public class MergeSort implements SortUtil.Sort{ WBvh<wTw;
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/* (non-Javadoc) z|E/pm$^
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) (e.?). e
*/ &@NTedg!
public void sort(int[] data) { aNs~Uad1U
int[] temp=new int[data.length]; }8`W%_Yk
mergeSort(data,temp,0,data.length-1);
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private void mergeSort(int[] data,int[] temp,int l,int r){ q$x$ 4
int mid=(l+r)/2; ,rc?,J1l
if(l==r) return ; o."k7fLB
mergeSort(data,temp,l,mid); 84 5a%A$
mergeSort(data,temp,mid+1,r); w/&)mm{
for(int i=l;i<=r;i++){ dNK Q&TC
temp=data; Oh)s"f\N
} Q$u&/g3NvL
int i1=l; P@lDhzd
int i2=mid+1; u_ou,RF
for(int cur=l;cur<=r;cur++){ S{wR Z|8U
if(i1==mid+1) #SyF-QZ[1
data[cur]=temp[i2++]; #e)A
else if(i2>r) lOB*M!8
data[cur]=temp[i1++]; RrB)u?
else if(temp[i1] data[cur]=temp[i1++]; e1ts/@V
else -hL 0}Wy$N
data[cur]=temp[i2++]; OI/m_xx@j
} j=c=Pe"?u
} 7m='-_w)?w
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} +c'b=n9j
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改进后的归并排序: KT'Ebb]
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package org.rut.util.algorithm.support; 0oR'"Vo
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{
import org.rut.util.algorithm.SortUtil; _:"PBN9
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/** f+3ico]f@
* @author treeroot ~hiJOaCzM
* @since 2006-2-2 "wwAbU<
* @version 1.0 t3LRmjL
*/ H[oCI|k
public class ImprovedMergeSort implements SortUtil.Sort { "MS}@NLUW
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private static final int THRESHOLD = 10; $U. >]i
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/* 3X|7 R
* (non-Javadoc) j:k}6]p}
* 5~8FZ-x
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) <=O/_Iu(
*/ sVzU>
public void sort(int[] data) { MX*T.TG8
int[] temp=new int[data.length]; 0'm$hU}
mergeSort(data,temp,0,data.length-1); o}^/Km+t
} @bfW-\ I
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private void mergeSort(int[] data, int[] temp, int l, int r) { (_2Iu%F
int i, j, k; +`jI z'+
int mid = (l + r) / 2; ahJ-T@
if (l == r) TTGk"2
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return; "Sx}7?8AB
if ((mid - l) >= THRESHOLD) WC0gJy
mergeSort(data, temp, l, mid); oY
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else }253Q!f
insertSort(data, l, mid - l + 1); xvpCOoGsz
if ((r - mid) > THRESHOLD)
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mergeSort(data, temp, mid + 1, r); %5 [,U)X"
else *;N6S~_'Y
insertSort(data, mid + 1, r - mid); '>"riEk
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for (i = l; i <= mid; i++) { y"bSn5B[
temp = data; _U
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} 1UHlA8w7Q
for (j = 1; j <= r - mid; j++) { A5WchS'
temp[r - j + 1] = data[j + mid]; -9D2aY_>
} c>~q2_}W(
int a = temp[l]; E8gbm&x*
int b = temp[r]; uDe%M
for (i = l, j = r, k = l; k <= r; k++) { .
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if (a < b) { fCMFPhF
data[k] = temp[i++]; heizO",8.&
a = temp; --D&a;CO}
} else { A,H|c="
data[k] = temp[j--]; _0GM!Cny
b = temp[j]; n PAl8
} mQ$a^28=qR
} l^~E+F~
} \jR('5DcB
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/** r}>q*yx:
* @param data Tr\6AN?o
* @param l BdMmeM2h
* @param i V
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*/ 'c[|\M!u
private void insertSort(int[] data, int start, int len) { :Qc[>:N
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); E\_Wpk
} Q:v9C ^7
} NT1"?Thx|
} isF
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}