归并排序: `xx.,;S
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package org.rut.util.algorithm.support; ;"cQ)=s9Y
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import org.rut.util.algorithm.SortUtil; ^.:&ZsqV
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/** PESvx>:
* @author treeroot ' ds2\gN
* @since 2006-2-2 @U!&XZ]h
* @version 1.0 {X<g93
*/ ]*P9=!x|M
public class MergeSort implements SortUtil.Sort{ 8o+:|V~X
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/* (non-Javadoc) ;`/a. /bc
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) `Njvk
*/ r-YJ$/J
public void sort(int[] data) { 7 q!==P=
int[] temp=new int[data.length]; 9{4oz<U
mergeSort(data,temp,0,data.length-1); H
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} ujnT B*Cqc
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private void mergeSort(int[] data,int[] temp,int l,int r){ mKu,7nMvF
int mid=(l+r)/2; c
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if(l==r) return ; %0 {_b68x
mergeSort(data,temp,l,mid); 6O,k! y>
mergeSort(data,temp,mid+1,r); 3#'8S_
for(int i=l;i<=r;i++){ %\-E
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temp=data; )NhC+=N
} iS)-25M'
int i1=l; Dqo#+_v
int i2=mid+1; .s>@@m-
for(int cur=l;cur<=r;cur++){ C_>XtcU
if(i1==mid+1) @.$-
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data[cur]=temp[i2++]; Z[w}PN,xV
else if(i2>r) ?7V~>i8[
data[cur]=temp[i1++]; fZ &
else if(temp[i1] data[cur]=temp[i1++]; f8[O]MrO;
else )bih>>H
data[cur]=temp[i2++]; @@^iN~uf
} RtR@wZ2\s
} *<S>PbqLw
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改进后的归并排序: <A=1]'1\r
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package org.rut.util.algorithm.support; \~A qA!)6
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import org.rut.util.algorithm.SortUtil; L(C`<iE&3
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/** @%x2d1FS
* @author treeroot :,JjN&
* @since 2006-2-2 NjZ~b/
* @version 1.0 }R16WY_'
*/ L$3 lsu!4n
public class ImprovedMergeSort implements SortUtil.Sort { kd !?N
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private static final int THRESHOLD = 10; AvrvBz[
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/* ;$&\:-6A#
* (non-Javadoc) ^D+^~>f
* PlH~um[J
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 8 5ET$YV
*/ 'o}[9ZBjn
public void sort(int[] data) { T 'c39
int[] temp=new int[data.length]; m=l'9j"D
mergeSort(data,temp,0,data.length-1); ,\v'%,:C
} $2h%IK>#G
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private void mergeSort(int[] data, int[] temp, int l, int r) { V($V8P/
int i, j, k; tjFX(;^[
int mid = (l + r) / 2; lh'S_p8g
if (l == r) LE<J<~2Z
return; NCkI[d]B@
if ((mid - l) >= THRESHOLD) X8ap
mergeSort(data, temp, l, mid); b v_UroTr
else j~{cT/5Y_
insertSort(data, l, mid - l + 1); h97#(_wV>
if ((r - mid) > THRESHOLD) 6qZ\^ U
mergeSort(data, temp, mid + 1, r); A811VL^
else ErNYiYLi]
insertSort(data, mid + 1, r - mid); Tp;W4]'a*:
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for (i = l; i <= mid; i++) { ~i;{+j6Ho!
temp = data; 1`7zYW&L
} c$V5E t
for (j = 1; j <= r - mid; j++) { * $f`ouJl
temp[r - j + 1] = data[j + mid]; i$E [@
} Ll|_Wd.K,
int a = temp[l]; =p'+kS+
int b = temp[r]; L_!ShE
for (i = l, j = r, k = l; k <= r; k++) { oVy{~D=
if (a < b) { O<cP1TF
data[k] = temp[i++]; _F%`7j
a = temp; 4c<
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} else { #3qeRl
data[k] = temp[j--]; j-ej7
b = temp[j]; nf
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} aL;!BlU8v
} Vbl-Ff
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/** r+FEgSDa]
* @param data 7l69SQo]?
* @param l v3-'
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* @param i U0_^6zd_
*/ _Ub
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private void insertSort(int[] data, int start, int len) { l\s!A&L
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); )SmnLvL
} q;'f3Y
} kMQ
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} |Ghk8 WA
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}