归并排序: :."oWqb)
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package org.rut.util.algorithm.support; /kg#i&bP~
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import org.rut.util.algorithm.SortUtil; '[%#70*
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/** w^$C\bCbh
* @author treeroot j%^4
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* @since 2006-2-2 Y?3tf0t/
* @version 1.0 hpPacN
*/ y$SUYG'v
public class MergeSort implements SortUtil.Sort{ |5O>7~Tp
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/* (non-Javadoc) a !%,2|U
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) }(|gC,
*/ LdN[N^n[H
public void sort(int[] data) { k0K$OX*:e
int[] temp=new int[data.length]; p'1/J:EnV
mergeSort(data,temp,0,data.length-1); M*kE |q/K
} 0doJF@H
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private void mergeSort(int[] data,int[] temp,int l,int r){ EG\;l9T
int mid=(l+r)/2; %Uz\P|6PO
if(l==r) return ; b/]4#?g
mergeSort(data,temp,l,mid); f:<BUqa
mergeSort(data,temp,mid+1,r); f17E2^(I(}
for(int i=l;i<=r;i++){ }^ ,D~b-nB
temp=data; 31a lQ\TH
} r]Wt! oHm5
int i1=l; {7z]+ h
int i2=mid+1; Rqp#-04*W
for(int cur=l;cur<=r;cur++){ >RAg63!`
if(i1==mid+1) 4n7Kz_!SVf
data[cur]=temp[i2++]; ,_Bn{T=U
else if(i2>r) NR1M W^R
data[cur]=temp[i1++]; k4{|Xn
else if(temp[i1] data[cur]=temp[i1++]; s(3HZ>qx;
else ?X@[ibH6
data[cur]=temp[i2++]; H?J:_1
} _#6Qf
} h\w;SDwOk
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} )`f-qTe
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改进后的归并排序: >19s:+
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package org.rut.util.algorithm.support; 5P"R'/[PA_
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import org.rut.util.algorithm.SortUtil; ,.>9$( s
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/** Vb\g49\o/
* @author treeroot dB0#EJaE
* @since 2006-2-2 3WGE T[3
* @version 1.0 !V3+(o1
*/ :VZS7$5
public class ImprovedMergeSort implements SortUtil.Sort { >{tn2Fkg>
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*
private static final int THRESHOLD = 10; Af]zv~uM
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/* 8TT#b?d
* (non-Javadoc) Cd
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* $jE<n/8
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) EOXkMr
*/
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public void sort(int[] data) { hQm=9gS
int[] temp=new int[data.length]; {/,(F^T>2
mergeSort(data,temp,0,data.length-1); [07E-TT2U
} zdrP56rzZ
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private void mergeSort(int[] data, int[] temp, int l, int r) { ^]R_t@
int i, j, k; VPYLDg.'
int mid = (l + r) / 2; *m+FMyr
if (l == r) A_wf_.l4h
return; Yz_}*
if ((mid - l) >= THRESHOLD) x-CjxU3
mergeSort(data, temp, l, mid); s0f+AS|}
else )__sw
insertSort(data, l, mid - l + 1); l!88|~
if ((r - mid) > THRESHOLD) D5P-$1KPt
mergeSort(data, temp, mid + 1, r); jc9C|r
else Xpg-rxX
insertSort(data, mid + 1, r - mid); :p/=KI_
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for (i = l; i <= mid; i++) { I!*P' {lh
temp = data; B]G2P`sN
} ]A%3\)r
for (j = 1; j <= r - mid; j++) { Za|iU`e\
temp[r - j + 1] = data[j + mid]; C78g|n{
} qm!oJL
int a = temp[l]; xz!0BG
int b = temp[r]; w)+1^eW
for (i = l, j = r, k = l; k <= r; k++) { xB Wl|j
if (a < b) { e72Fz#<q
data[k] = temp[i++]; [#uhMn^
a = temp; )H
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} else { m1;Htw
data[k] = temp[j--]; 8fP2qj0
b = temp[j]; n~ad#iN
} `~)?OTzU#
} ?DUim1KG
} #RR;?`,L}
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/**
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* @param data 2r&R"B1`(
* @param l }$kQs!#
* @param i Qx)Jtb0`V
*/ fP[& a9l
private void insertSort(int[] data, int start, int len) { !%PWig-
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); |c2xy
} T6M+|"92
} a{'Z5ail
} @I-Lv5
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}