归并排序: )E*f30
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package org.rut.util.algorithm.support; XsQ81j.
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import org.rut.util.algorithm.SortUtil; Tx!t3;Yz[
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/** 6p*X8j3pW
* @author treeroot rDhQ3iCqo
* @since 2006-2-2 ?]$<Ufr
* @version 1.0 Qn.dL@W
*/ &1yJrj9y
public class MergeSort implements SortUtil.Sort{ 0NGth(2
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/* (non-Javadoc) wT\BA'VQ
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 5WJ ~%"O
*/ &:&l+
public void sort(int[] data) { UMe?nAC
int[] temp=new int[data.length]; ;!A8A4~nu
mergeSort(data,temp,0,data.length-1); Z@Zg3AVU
} q+9->D(6
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private void mergeSort(int[] data,int[] temp,int l,int r){ v_EgY2l(
int mid=(l+r)/2; IDT\hTPIs
if(l==r) return ; g9|OhymB
mergeSort(data,temp,l,mid); 5L[imO M0
mergeSort(data,temp,mid+1,r); D]fuX|f~ul
for(int i=l;i<=r;i++){ v:QUwW
temp=data; yuBRYy#E|%
} F:T(-,
int i1=l; el*|@#k}
int i2=mid+1; Tp?IK_
for(int cur=l;cur<=r;cur++){ `gx\m=xG
if(i1==mid+1) $q:l \
data[cur]=temp[i2++]; *3`R W<Z
else if(i2>r) H'zAMGZa
data[cur]=temp[i1++]; #p>&|I
else if(temp[i1] data[cur]=temp[i1++]; K~,!IU_QG
else J<"K`|F
data[cur]=temp[i2++]; 5>.ATfAsV
} Ie/_gz^
} gfj_]
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改进后的归并排序: EQ,`6UT>
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package org.rut.util.algorithm.support; jH9PD8D\
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import org.rut.util.algorithm.SortUtil; '1LN)Yw
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/** ^UJIDg7zS
* @author treeroot xOKJOl
* @since 2006-2-2 Z9$pY=8^?
* @version 1.0 @2h hB W
*/ >IrQhSF
public class ImprovedMergeSort implements SortUtil.Sort { 7;q0'_G
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private static final int THRESHOLD = 10; IC'+{3.m8
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/* S/) ),~`4
* (non-Javadoc) 9;v3
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* <Hr<QiAK
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) #1E4
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*/ yKl^-%Uq<
public void sort(int[] data) { ;&=CZ6vH
int[] temp=new int[data.length]; }.)R#hG?
mergeSort(data,temp,0,data.length-1); >8I~i:hn
} /B?wn=][
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private void mergeSort(int[] data, int[] temp, int l, int r) { 01-rBto$
int i, j, k; h<3b+*wYJC
int mid = (l + r) / 2; 1a(\F7
if (l == r) 2~f*o^%l
return; KPO w
if ((mid - l) >= THRESHOLD) /kG?I_z
mergeSort(data, temp, l, mid); rtz-kQ38R
else X,l7>>L{g
insertSort(data, l, mid - l + 1); xbhHP2F|
if ((r - mid) > THRESHOLD) 8A&N+sT
mergeSort(data, temp, mid + 1, r); j[:70%X
else ]rj~3du\
insertSort(data, mid + 1, r - mid); RNw#sR
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for (i = l; i <= mid; i++) { {U_ ,y(V
temp = data; 7QTS@o-
} 6AJ`)8HX
for (j = 1; j <= r - mid; j++) { wE.jf.q
temp[r - j + 1] = data[j + mid]; 1gK^x^l*f
} 8Pa*d/5Y(
int a = temp[l]; '+/mt_re=
int b = temp[r]; 9ns( F:
for (i = l, j = r, k = l; k <= r; k++) { wsB-(
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if (a < b) { {l$)X
data[k] = temp[i++]; A4@z+ebb l
a = temp; zqdkt `
} else { drjNK!XL@
data[k] = temp[j--]; ^2Cqy%x-
b = temp[j]; >oJabR
} cQ- #]
} A'jL+dI.
} Q"
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/** ;~:Z~8+{c
* @param data ,^c-}`!K
* @param l Uz_ob9l<#H
* @param i D.{vuftu
*/ ==?wG!v2 h
private void insertSort(int[] data, int start, int len) { [DjlkA/Zg
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); h\@X!Z,
} 3lWGa7<4Z
} >g!$H}\
} n]#YL4j
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}