归并排序: EFv^uve
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package org.rut.util.algorithm.support; &t6:1 T
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import org.rut.util.algorithm.SortUtil; :mhO/Bx
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/** sF3@7~m4
* @author treeroot e.W <pI,
* @since 2006-2-2 ,[<$X{9
* @version 1.0 thz[h5C?C
*/ QZJnb%]
public class MergeSort implements SortUtil.Sort{ O*%5P5'p"{
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/* (non-Javadoc) e/x6{~ju^N
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) T.W^L'L`
*/ lUdk^7:M
public void sort(int[] data) { tT+W>oA/M
int[] temp=new int[data.length]; F<b/)<Bm=
mergeSort(data,temp,0,data.length-1); Rh%@N.Z*
} *y', eB
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private void mergeSort(int[] data,int[] temp,int l,int r){ S~)_=4Z
int mid=(l+r)/2; .)<l69ZD Z
if(l==r) return ; $4Dr +Z
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mergeSort(data,temp,l,mid); Z29LtKr
mergeSort(data,temp,mid+1,r); ! F<::fN
for(int i=l;i<=r;i++){ O;|jLf_If
temp=data; a:;7'w'
} dptfIBYc+
int i1=l; OIkjO}/7
int i2=mid+1; K"ly\$F
for(int cur=l;cur<=r;cur++){ 3p]\l ]=
if(i1==mid+1) /qFY$vj
data[cur]=temp[i2++]; p)VMYu
else if(i2>r) =Y*@8=V
data[cur]=temp[i1++]; IC1nR
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else if(temp[i1] data[cur]=temp[i1++]; DXQ]b)y+N
else c}s#!|E0v
data[cur]=temp[i2++]; Sjo-Xf}
} lMcO2006L
} lbPn<
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} dnV&U%fO
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改进后的归并排序: ,L4zhhl!_
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package org.rut.util.algorithm.support; (?ULp{VPFl
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import org.rut.util.algorithm.SortUtil; FjMKb
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/** ]wfY<Z
* @author treeroot 9_8\xLk
* @since 2006-2-2 =R ZPDu
* @version 1.0 ZXXJ!9-&+J
*/ |kD69
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public class ImprovedMergeSort implements SortUtil.Sort { 1/i1o nu}
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private static final int THRESHOLD = 10; <~aKwSF[wW
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/* 1 ^30]2'_
* (non-Javadoc) ju07gzz
* &%g$Bi,G
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) #XG3{MGX[
*/ R / ND f`
public void sort(int[] data) { A~X\ dcn
int[] temp=new int[data.length]; =yoR>llbBC
mergeSort(data,temp,0,data.length-1); a8-V`
}
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private void mergeSort(int[] data, int[] temp, int l, int r) { 'z{|#zd9
int i, j, k; 2R,8q0qR:
int mid = (l + r) / 2; X|D-[|P
if (l == r) M8$eMS1
return; 4*IXBi7%
if ((mid - l) >= THRESHOLD) h<bhH=6~
mergeSort(data, temp, l, mid); ~gHn>]S0
else P 00%EB
insertSort(data, l, mid - l + 1); Z9|A"[b
if ((r - mid) > THRESHOLD) s0:M'wA
mergeSort(data, temp, mid + 1, r); 9JX@ck
else {:3:GdM6
insertSort(data, mid + 1, r - mid); %3AE2"
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for (i = l; i <= mid; i++) {
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temp = data; %nG>3.%
} m*YfbOhs#
for (j = 1; j <= r - mid; j++) { FnI}N;"
temp[r - j + 1] = data[j + mid]; *$`N5;7'`
} ZJm$7T)V
int a = temp[l]; $ M/1pZ
int b = temp[r]; =vvd)og
for (i = l, j = r, k = l; k <= r; k++) { lrL:G[rt
if (a < b) { (h=]Ox
data[k] = temp[i++]; /W .G-|:
a = temp; oI'& &Bt
} else { Ab>Kf r#
data[k] = temp[j--]; ]mz '(t
b = temp[j]; qkz|r?R)
} [h !i{QD
} 7U?#Xi5
} .p> ".q
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/** gs=ok8w
* @param data "C(yuVK1G
* @param l Lusd kc7
* @param i ofw&?Sk0
*/ %d*0"<v
private void insertSort(int[] data, int start, int len) { lpS v
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 6VuyKt
} ,>za|y<n
} }0Uh<v@
} /8nUecr
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}