归并排序: %U5P}
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package org.rut.util.algorithm.support; ^0~c7`k`V
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import org.rut.util.algorithm.SortUtil; g+ }s:9
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/** aM{@1mBm
* @author treeroot 8pk#sJ51
* @since 2006-2-2 i#RElH
* @version 1.0 P}hY{y'
*/ Z.:<TrN
public class MergeSort implements SortUtil.Sort{ ~mK-8U4>K,
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/* (non-Javadoc) NSS4vtA
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) sB( `[5I
*/ s[3![
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public void sort(int[] data) { ZUXse1,
int[] temp=new int[data.length]; s~LZOPN
mergeSort(data,temp,0,data.length-1); Z .bit_(
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private void mergeSort(int[] data,int[] temp,int l,int r){ GG_^K#*
int mid=(l+r)/2;
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if(l==r) return ; *Mwfod
mergeSort(data,temp,l,mid); df4sOqU
mergeSort(data,temp,mid+1,r); U=F-]lD
for(int i=l;i<=r;i++){ 4|6&59?pnc
temp=data; BbrT f"`
} Y9i9Uc.]
int i1=l; Nmp>UE,7[
int i2=mid+1; -@ZzG uS(
for(int cur=l;cur<=r;cur++){ \5'O.*pr
if(i1==mid+1) m<4s*q0\i
data[cur]=temp[i2++]; [`.3f'")j
else if(i2>r) hdd>&?p3
data[cur]=temp[i1++]; @PQrmn6w
else if(temp[i1] data[cur]=temp[i1++]; S5~`T7Ra
else ,!6M*|
data[cur]=temp[i2++]; vuR5}/Ev
} MSZ!W(7,<
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改进后的归并排序: <i}q=%W!1
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package org.rut.util.algorithm.support; 3P//H88LY
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import org.rut.util.algorithm.SortUtil; $ViojW>
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/** '7xxCj/*
* @author treeroot $D QD$
* @since 2006-2-2 .pZ o(*
* @version 1.0 K2cq97k,d
*/ 8jy-z"jc
public class ImprovedMergeSort implements SortUtil.Sort { 3 ppuQQ
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private static final int THRESHOLD = 10; ;/@?6T"
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/* w]};0v&\~s
* (non-Javadoc) )A="eW_>
* 9&jQ
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) f}[H
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*/ `$S^E !=
public void sort(int[] data) { +D:83h{
int[] temp=new int[data.length]; ?}vzLgp
mergeSort(data,temp,0,data.length-1); -a
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} v9%nau4
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private void mergeSort(int[] data, int[] temp, int l, int r) { dgS4w@)@V;
int i, j, k; )xB$LJM8
int mid = (l + r) / 2; i?F[||O"$
if (l == r) =~J"kC
return; Ovvny$
if ((mid - l) >= THRESHOLD) `Kh]x9Z
mergeSort(data, temp, l, mid); LGIalf*7
else >b>MKm>q
insertSort(data, l, mid - l + 1); NEA_Plt
if ((r - mid) > THRESHOLD) 79D=d'eA
mergeSort(data, temp, mid + 1, r); 3 brb*gI_b
else bH*@,EE
insertSort(data, mid + 1, r - mid); 42fprt
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for (i = l; i <= mid; i++) { $+Vmwd;
temp = data; %=V" CJ$|
} R
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for (j = 1; j <= r - mid; j++) {
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temp[r - j + 1] = data[j + mid]; 7p^@;@V
} ~<n(y-P^
int a = temp[l]; >;)2NrJV
int b = temp[r]; "2a$1Wmj(
for (i = l, j = r, k = l; k <= r; k++) { 0Cl,8P
if (a < b) { <B!'3C(P
data[k] = temp[i++]; CoU3S,;*
a = temp; =HVfJ"vK
} else { R|iEv t
data[k] = temp[j--]; &K>cW$h=a
b = temp[j]; [|4}~UV
} AHwG<k
} bFg*l$`5
} qxfLfgu^
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/** 4otl_l(`yv
* @param data aqF+zPKs6
* @param l :q^R
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* @param i ;{k=C2
*/ P+h6!=nD7
private void insertSort(int[] data, int start, int len) { ^|#>zCt^
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); S?L#N
} Q!yb16J
} +'|{1gB
} ,yICNtP
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}