归并排序: 3X,SCG
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package org.rut.util.algorithm.support; )ZI9n7
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import org.rut.util.algorithm.SortUtil; @Q=P6Rz
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/** iQI$Y]Y7
* @author treeroot q|[P[7z
* @since 2006-2-2 %](H?'H
* @version 1.0
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*/ o=,q4;R'
public class MergeSort implements SortUtil.Sort{ 5>e3srKu
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/* (non-Javadoc) Fk 5;
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) U/|H%b
*/ u7Xr!d+wR
public void sort(int[] data) { #78P_{#!
int[] temp=new int[data.length]; s|1BqoE
mergeSort(data,temp,0,data.length-1); k$hNibpkt
} ;{Sgv^A
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private void mergeSort(int[] data,int[] temp,int l,int r){ 2[*r9%W
int mid=(l+r)/2; R&OqmhT!
if(l==r) return ; (;11xu
mergeSort(data,temp,l,mid); 9_6.%qj&
mergeSort(data,temp,mid+1,r); \G}$+
for(int i=l;i<=r;i++){ DB^"iof
temp=data; fnUR]5\tc
} A-"}aCmik
int i1=l; \:*<En0
int i2=mid+1; 0> 6;,pd"
for(int cur=l;cur<=r;cur++){ 3gn)q>Xj$
if(i1==mid+1) gyI(O>e
data[cur]=temp[i2++]; E[FRx1^R9
else if(i2>r) f.o,VVYi
data[cur]=temp[i1++]; 7sQw&yUL)
else if(temp[i1] data[cur]=temp[i1++]; B~0L'8WzW
else 4+V+SD
data[cur]=temp[i2++]; %>cl0W3x
} B~/LAD_
} _V9 O,"DDc
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} bs%lMa.o
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改进后的归并排序: 2g6G\F
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package org.rut.util.algorithm.support; $hkMJ),T~
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import org.rut.util.algorithm.SortUtil; o*_O1P
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/** S[b)`Wi D
* @author treeroot )m-l&UK
* @since 2006-2-2 >t/P^fr_F
* @version 1.0 DiB~Ovh|
*/ z_dorDF8`>
public class ImprovedMergeSort implements SortUtil.Sort { s{- `y`JP
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private static final int THRESHOLD = 10; 5K;vdwSB
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/* Vs1j9P|G
* (non-Javadoc) [\M=w7
* y1JxAj
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) $>3/6(bW
*/ #nE%.k|R~
public void sort(int[] data) { z|Hc=AU8y
int[] temp=new int[data.length]; FA.h?yfr
mergeSort(data,temp,0,data.length-1); ;
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} %0PdN@I
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private void mergeSort(int[] data, int[] temp, int l, int r) { _u`NIpXSP
int i, j, k; s_=/p5\
int mid = (l + r) / 2; ~=Y<B/
if (l == r) ICD(#m
return; {QTrH-C
if ((mid - l) >= THRESHOLD) :%dIX}F
mergeSort(data, temp, l, mid); >b |TaQ
else -}lcMZY
insertSort(data, l, mid - l + 1); '8NKrI
if ((r - mid) > THRESHOLD) ^KU:5Bn
mergeSort(data, temp, mid + 1, r); O?8^I<
else kF9T 9
insertSort(data, mid + 1, r - mid); ,KlTitJl\+
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for (i = l; i <= mid; i++) { 1Ftl1uf
temp = data; JD^&d~n_
} :<OInKE>Cx
for (j = 1; j <= r - mid; j++) { }mjJglK!N
temp[r - j + 1] = data[j + mid]; S8O^^jJq;
} .wrNRU7s
int a = temp[l]; =a`l1zn8=
int b = temp[r]; g8yWFqE!T
for (i = l, j = r, k = l; k <= r; k++) { `A.!<bO)]
if (a < b) { <}RU37,W
data[k] = temp[i++]; 5#zwdoQ
a = temp; g1Q^x/
} else { G4Zs(:a
data[k] = temp[j--]; !8"516!d|p
b = temp[j]; # E'g{.N
} &z-f,`yG
} }b+tD3+
} {4Q4aL(
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/** yA%(!v5UT
* @param data EO'[AU% ~
* @param l vgzNT4o
* @param i q/,W'lQ\;
*/ _wWh7'u~G
private void insertSort(int[] data, int start, int len) { 6&=xu|M<x=
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); <^&NA<2
} kb?QQ\e
} 4q)eNcs
} A2z%zMlZc
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}