归并排序: B+#!%J_
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package org.rut.util.algorithm.support; $d3al%Uo
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import org.rut.util.algorithm.SortUtil; )gYsg
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/** F"1)y>2k
* @author treeroot P%A;EF~v
* @since 2006-2-2 c3W9"
* @version 1.0 }A\s`Hm
*/ vxhs1vh
public class MergeSort implements SortUtil.Sort{ 7xTgG!>v
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/* (non-Javadoc) }><VcouJ[
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Uoe;4ni
*/ ?&
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public void sort(int[] data) { h.d-a/
int[] temp=new int[data.length]; y3{'s>O6
mergeSort(data,temp,0,data.length-1); r:]t9y>$<
} HT0VdvLw
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private void mergeSort(int[] data,int[] temp,int l,int r){ 8/F}vfKEN
int mid=(l+r)/2; +!h~T5Ck
if(l==r) return ; {+%|nOWV
mergeSort(data,temp,l,mid); l2vIKc
mergeSort(data,temp,mid+1,r); dmI~$*
for(int i=l;i<=r;i++){
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temp=data; b;G3&R]
} s!(O7Ub
int i1=l; ?f f !(U
int i2=mid+1; X |zQZ<CO
for(int cur=l;cur<=r;cur++){ Hof@,w
if(i1==mid+1) meey5}
data[cur]=temp[i2++]; >-J%=P
else if(i2>r) _;L%? -2c
data[cur]=temp[i1++]; }Q&zYC]d
else if(temp[i1] data[cur]=temp[i1++]; h\| ~Q.kG
else ^YG'p?r.s
data[cur]=temp[i2++]; (k/[/`3ST
} U l8G R
} #JMww
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} m}ZkNWH
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改进后的归并排序: E-gI'qG\(
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package org.rut.util.algorithm.support; tljZE)
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import org.rut.util.algorithm.SortUtil; Sk7l&B
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/** %3b;`Oa
* @author treeroot #gn{X!;-;
* @since 2006-2-2 {9?++G"\
* @version 1.0 :5|'C
*/ R9XISsM^
public class ImprovedMergeSort implements SortUtil.Sort { eajctkzj
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private static final int THRESHOLD = 10; do,ZCn
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/* &U*MLf83`
* (non-Javadoc) a7$-gW"Z(,
* [bM$n
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ,w-=8>5lrj
*/ ^u2unZ9BK!
public void sort(int[] data) { pRR1k?
int[] temp=new int[data.length]; m8M2ka
mergeSort(data,temp,0,data.length-1); YX*NjXL
} VWhq+8z
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private void mergeSort(int[] data, int[] temp, int l, int r) { N;Hoi8W
int i, j, k; >A&D/kMO
int mid = (l + r) / 2; a(.q=W
if (l == r) P"*#mH[W|
return; cft/;Au{
if ((mid - l) >= THRESHOLD) 'O>p@BEK
mergeSort(data, temp, l, mid);
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else <MK4#I1I
insertSort(data, l, mid - l + 1); +vf~s^
if ((r - mid) > THRESHOLD) ;OC~,?O5
mergeSort(data, temp, mid + 1, r); oZ]^zzoEcg
else v7-z<'?s~
insertSort(data, mid + 1, r - mid); $-^
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for (i = l; i <= mid; i++) { ohEIr2
temp = data; F:$*0!
} Dh+<|6mx
for (j = 1; j <= r - mid; j++) { z`]sWi F0
temp[r - j + 1] = data[j + mid]; QC\r|RXW
} #su R[K*S
int a = temp[l]; Z$*m=]2
int b = temp[r]; ,8.Fd|#L
for (i = l, j = r, k = l; k <= r; k++) { 813t=A
if (a < b) { Rtywi}VV2
data[k] = temp[i++]; r0^ *|+
a = temp; $Gs9"~z?;
} else { ,I|3.4z
data[k] = temp[j--]; bi{G
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b = temp[j]; kB#;s
} %*bGW'Cw
} TmviYP gb
} (V(8E%<c
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/** G/
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* @param data <@.!\
* @param l \u4`6EYF?
* @param i yC&u^{~BC
*/ +HDfEo T
private void insertSort(int[] data, int start, int len) { $I0&I[_LzK
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1);
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} r;n^\[Ov0,
} :<p3L!?8y
} 1S{AGgls5
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}