归并排序: hb;CpA
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package org.rut.util.algorithm.support; i,;JI>U
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import org.rut.util.algorithm.SortUtil; Kc\8GkdB
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/** KuJ9bn{u!C
* @author treeroot UPGUJ>2Z
* @since 2006-2-2
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* @version 1.0 >rQj1D)@
*/ ;B 8Q,.t>x
public class MergeSort implements SortUtil.Sort{ rn)Gx25
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/* (non-Javadoc) v1{j1~ZR
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 6Pl|FIJF
*/ VVSt,/SO
public void sort(int[] data) { flPS+
int[] temp=new int[data.length]; hYzP6?K"
mergeSort(data,temp,0,data.length-1); >Gpq{Ph[
} x$-kw{N
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private void mergeSort(int[] data,int[] temp,int l,int r){ gNW+Dq|X%
int mid=(l+r)/2; q~9-A+n
if(l==r) return ; kV1L.Xg
mergeSort(data,temp,l,mid); 5vLXMdN
mergeSort(data,temp,mid+1,r); ~Fh+y+g?
for(int i=l;i<=r;i++){ +ytP5K7
temp=data; q~> +x?30
} RWR{jM]V
int i1=l; 5?$MZaT
int i2=mid+1; _R ]s1
for(int cur=l;cur<=r;cur++){ a9e0lW:=c
if(i1==mid+1) m,\+RUW'
data[cur]=temp[i2++]; y]yl7g =~
else if(i2>r) t)W=0iEd9
data[cur]=temp[i1++]; jm%s#`)g
else if(temp[i1] data[cur]=temp[i1++]; 9jI muSZ
else H[.)&7M\
data[cur]=temp[i2++]; ^Saf
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} /lECgu*#69
} &fB=&jc*j
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} mBwz.KEm<
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改进后的归并排序: Ee}|!n>
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package org.rut.util.algorithm.support; } +Sp7F1q
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import org.rut.util.algorithm.SortUtil; "T=j\/Q
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/** |1_$\k9Y&
* @author treeroot +&7V@
* @since 2006-2-2 DRm`y>.
* @version 1.0 lU!_V%n
*/ `_cv& "K9f
public class ImprovedMergeSort implements SortUtil.Sort { -crMO57/
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private static final int THRESHOLD = 10; 3}\ z&|
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/* y%vAEQ2j=
* (non-Javadoc) `0ym3} (O
* !T<,fR+8X
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) @@*x/"GJG
*/ E\D,=|Mul
public void sort(int[] data) { Zo2+{a
int[] temp=new int[data.length]; (!fx5&F
mergeSort(data,temp,0,data.length-1); \Ebh6SRp\
} b/[X8w'VP
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private void mergeSort(int[] data, int[] temp, int l, int r) { o}r_+\n
int i, j, k; nZi&`HjQ
int mid = (l + r) / 2; _}[WX[Le{
if (l == r) AsE77AUA
return; k5K5OpY
if ((mid - l) >= THRESHOLD) $H+X'1
mergeSort(data, temp, l, mid); ^J> m4`
else Y}BP]#1
insertSort(data, l, mid - l + 1); !B Pm{_C
if ((r - mid) > THRESHOLD) H^kOwmSzh
mergeSort(data, temp, mid + 1, r); O$,
else X[h{g`
insertSort(data, mid + 1, r - mid); })]
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for (i = l; i <= mid; i++) { g8E5"jpXx3
temp = data; a^LckHPI>
} ZB1%Kn#zo4
for (j = 1; j <= r - mid; j++) { %' WC7s
temp[r - j + 1] = data[j + mid]; qery|0W
} (pCHj'
int a = temp[l]; 1p~ORQ
int b = temp[r]; ^@/wXj:
for (i = l, j = r, k = l; k <= r; k++) { k'%yvlv
if (a < b) {
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data[k] = temp[i++]; v\bWQs1
a = temp; 7Ku&Q<mi
} else { O-7)"
data[k] = temp[j--]; TI8\qIW
b = temp[j]; ;5;>f)diS
} L
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} ??e|ec2%
} CC^]Y.9
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/** Dn<3#V
* @param data EG^
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* @param l '%/=\Q`
* @param i y(<{e~
*/ }.D18bE(
private void insertSort(int[] data, int start, int len) { V?yQm4
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); Da)p%E>Q
} >A@yF?
} f{2UL ?y
} +a,#BSt
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}