归并排序: Ss~yy0
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package org.rut.util.algorithm.support; ,&F4|{
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import org.rut.util.algorithm.SortUtil; <$>Jsv
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/** F1A7l"X]
* @author treeroot q)f-z\
* @since 2006-2-2 vT=?UTq
* @version 1.0 |& Pa`=sp
*/ o"gtWAGH
public class MergeSort implements SortUtil.Sort{ 0ZAT;ea B
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/* (non-Javadoc) Jfs_9g5
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ,ZWaTp*D/
*/ rtn.^HF
public void sort(int[] data) { al1Nmc#
int[] temp=new int[data.length]; hk.vBbhs
mergeSort(data,temp,0,data.length-1); o;"Phc.
} y[A%EMd
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private void mergeSort(int[] data,int[] temp,int l,int r){ o6ag{Yp
int mid=(l+r)/2; #a+*u?jnnL
if(l==r) return ; MhL>6rn
mergeSort(data,temp,l,mid); )`,Y^`F2
mergeSort(data,temp,mid+1,r); =\FV_4)
for(int i=l;i<=r;i++){ D.ERt)l>
temp=data; Sg+0w7:2
} b[Qe} `W
int i1=l; ^rh{
int i2=mid+1; zDohp 5,
for(int cur=l;cur<=r;cur++){ D!WyT`T
if(i1==mid+1) CzfGb4
data[cur]=temp[i2++]; a,ZmDkzuv
else if(i2>r) %1Nank!Zj
data[cur]=temp[i1++]; 7 (kC|q\4M
else if(temp[i1] data[cur]=temp[i1++]; _O;2.M%@
else MO%kUq|pg
data[cur]=temp[i2++]; 231,v,X[
} vp4NH]fJ
} EQ%,IK/
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} 5H79-QLd
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改进后的归并排序: 5Z_ 7Sc
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package org.rut.util.algorithm.support; ]
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import org.rut.util.algorithm.SortUtil; Q:^.Qs"IK
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/** ~\khwNA
* @author treeroot I6vy:5d
* @since 2006-2-2 U'p-Ko#
* @version 1.0 $mu*iW\{
*/ UlQS]f~
public class ImprovedMergeSort implements SortUtil.Sort { tDQuimYu7
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private static final int THRESHOLD = 10; ?Rd{`5.D
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/* ; S~
* (non-Javadoc) rWULv
* U#6<80Ke
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) [I6&|Lz>
*/ nsN|[E8
public void sort(int[] data) { {?RVw`g&f
int[] temp=new int[data.length]; R5& R~1N
mergeSort(data,temp,0,data.length-1); 6DT^:LHS
} <! Z06
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private void mergeSort(int[] data, int[] temp, int l, int r) { -$sVqR>_
int i, j, k; :d=:>_[
int mid = (l + r) / 2; O48*"Z1
if (l == r) @Yj+u2!
return; 3%L@=q
if ((mid - l) >= THRESHOLD) ><wYk)0E
mergeSort(data, temp, l, mid); O6"S=o&
else kHb H{])
insertSort(data, l, mid - l + 1); *bSxobn
if ((r - mid) > THRESHOLD) <c.8f;1F
mergeSort(data, temp, mid + 1, r); yvIzgwN%s!
else P$#{a2
insertSort(data, mid + 1, r - mid); SX]uIkw
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for (i = l; i <= mid; i++) { 1LVO0lT
temp = data; zff<#yK1
} QWI)Y:<K/
for (j = 1; j <= r - mid; j++) { s"JD,gm$
temp[r - j + 1] = data[j + mid]; bae\EaS
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} \e9rXh%
int a = temp[l]; d#1yVdqRl
int b = temp[r]; M2!2J
for (i = l, j = r, k = l; k <= r; k++) { i`^[_
if (a < b) { YR-Ge
data[k] = temp[i++]; qV5lv-p
a = temp; hxZL/_n'
} else { 0s!';g Q
data[k] = temp[j--]; de_%#k1:L
b = temp[j]; N4)ZPLV
} l05'/duuJ
} *!^l
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} } /*U~!t
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/** K_ Od u^
* @param data v3b+Ddp
* @param l DH Qs_8Df
* @param i <O0.q.
*/ I=2b)"t0
private void insertSort(int[] data, int start, int len) { $pJw
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for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); YY4q99^K
} -dS@l'$
} }D[j6+E
} nArG
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}