归并排序: 3,j)PKf
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package org.rut.util.algorithm.support; h<.G^c)
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import org.rut.util.algorithm.SortUtil; ND\
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/** j380=?7
* @author treeroot Qp7|p
* @since 2006-2-2 cL&V2I5O
* @version 1.0 w,NK]<dU@
*/ T0W B
public class MergeSort implements SortUtil.Sort{ |U?5%
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/* (non-Javadoc) pez^]I
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ]GYO`,
*/ E|D~:M%~
public void sort(int[] data) { @oC8:
int[] temp=new int[data.length]; h0NM5
mergeSort(data,temp,0,data.length-1); ZLdvzH@'
} ;$@7iL
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private void mergeSort(int[] data,int[] temp,int l,int r){ |KF X0*70
int mid=(l+r)/2; e*uaxh+7
if(l==r) return ; OiX>^_iDt
mergeSort(data,temp,l,mid); 2 q J}5
mergeSort(data,temp,mid+1,r); $}<+~JpGfP
for(int i=l;i<=r;i++){ wJJ4F$"b
temp=data; BQv+9(:fQB
} F\+wM*:U
int i1=l; s+>""yi
int i2=mid+1; _`WbR&d2Id
for(int cur=l;cur<=r;cur++){ #d%'BUde
if(i1==mid+1) fGJPZe
data[cur]=temp[i2++]; d$s1l
else if(i2>r) X'Q$v~/
data[cur]=temp[i1++]; `pF|bZ?v
else if(temp[i1] data[cur]=temp[i1++]; \pZ,gF;y
else 4EzmH)4G
data[cur]=temp[i2++]; \4I1wdd|^
} Y((s<]7
} %y33evX/B
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} (,PO(
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改进后的归并排序: vpx8GiV
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package org.rut.util.algorithm.support; {zBf *x
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import org.rut.util.algorithm.SortUtil; C$\|eC j
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/** o:_}=1nh
* @author treeroot l2>G +t (,
* @since 2006-2-2 ^8aj\xe(
* @version 1.0 "<0BCJJ
*/ -;'8#"{`^
public class ImprovedMergeSort implements SortUtil.Sort { |c,":R
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private static final int THRESHOLD = 10; JpE4 o2
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/* zcD&xoL\H
* (non-Javadoc) 9H?er_6Yf
* bT}P":*y
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) CQ2{5
*/ bCg
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public void sort(int[] data) { z71.5n!C
int[] temp=new int[data.length]; i;c0X+[
mergeSort(data,temp,0,data.length-1); D61CO-E(D
} Z5;1ySn{
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private void mergeSort(int[] data, int[] temp, int l, int r) { =C8 t5BZ"
int i, j, k; U?JZ23>bbw
int mid = (l + r) / 2; >-
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if (l == r) ,Cj1S7GFR
return; /K2VSj3\
if ((mid - l) >= THRESHOLD) tYiK#N7
mergeSort(data, temp, l, mid); w"$CV@AJ
else M hNzmI&`
insertSort(data, l, mid - l + 1); %5RY Ea
if ((r - mid) > THRESHOLD) Bv
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mergeSort(data, temp, mid + 1, r); NY\q
else p!>FPS
insertSort(data, mid + 1, r - mid); V(1Ldl'a
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for (i = l; i <= mid; i++) { Lv+lLK
temp = data; *W,"UL6U8y
} E~ _2Jf\U
for (j = 1; j <= r - mid; j++) { |E0>-\6
temp[r - j + 1] = data[j + mid]; gxpR#/(E~
} R!;tF|]
int a = temp[l]; K>6#MI
int b = temp[r]; {&8-OoH ~
for (i = l, j = r, k = l; k <= r; k++) { _KC)f'Cx
if (a < b) { Oga0CR_
data[k] = temp[i++]; }9t$Cs%
a = temp; 6+BR5Nr
} else { /J`8Gk59
data[k] = temp[j--]; d*Dq=.F(
b = temp[j]; aB"W6[
} MBRRzq%F
} 5i7,s
} e~=fo#*2?@
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/** &Eg>[gAIlp
* @param data 1w'iD
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* @param l ~F^=7oq
* @param i |_8::kir:
*/ g<{/mxv/
private void insertSort(int[] data, int start, int len) { RK#e7
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); GrjL9+|x
} _aL:XKM
} ^RrufwUA
} :XcU @m
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}