归并排序: NR3`M?Hjf
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package org.rut.util.algorithm.support; NXI[q'y
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import org.rut.util.algorithm.SortUtil; S-!=NX&C
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/** [PWL<t::c
* @author treeroot 6/1$<!WH
* @since 2006-2-2 V`bs&5#Sx
* @version 1.0 ehT%s+aUw
*/ 7ZsA5%s=,
public class MergeSort implements SortUtil.Sort{ -DCa
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/* (non-Javadoc) n8u*JeN
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) $r79n-
*/ /oL8;:m
public void sort(int[] data) { K5`Rk"s
int[] temp=new int[data.length]; O('Nn]wo~9
mergeSort(data,temp,0,data.length-1);
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} p3yU:q#A
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private void mergeSort(int[] data,int[] temp,int l,int r){ ; )llt
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int mid=(l+r)/2; +pp9d-n
if(l==r) return ; g_q<ze
mergeSort(data,temp,l,mid); cp%ii'
mergeSort(data,temp,mid+1,r); d#>y }H9
for(int i=l;i<=r;i++){ &z@~B&O
temp=data; CT*,<l-D
} h}&b+1{X
int i1=l; ]tY:,Mfs
int i2=mid+1; Cv^`&\[SW+
for(int cur=l;cur<=r;cur++){ ;`UecLb#
if(i1==mid+1) Yb:pAzw6
data[cur]=temp[i2++]; :(p)1=I
else if(i2>r) Lgi[u"Du
data[cur]=temp[i1++]; _~M^ uW^l
else if(temp[i1] data[cur]=temp[i1++]; +S9PML){h
else o@k84+tn(
data[cur]=temp[i2++]; A5nO=
} wa:0X)KC?
} 4l @)K9F
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} !p[`IWZ
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改进后的归并排序: LM"y\q ]
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package org.rut.util.algorithm.support; ][7p+IsB
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import org.rut.util.algorithm.SortUtil; v(O=IUa
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/** XvKFPr0~
* @author treeroot GwLFL.Ke
* @since 2006-2-2 xs!p|
* @version 1.0 JhX=l-?
*/ yI)~]K
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public class ImprovedMergeSort implements SortUtil.Sort { 6rX_-Mm6w
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private static final int THRESHOLD = 10; T):SGW
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/* ,t,wy37*D
* (non-Javadoc) *b)Q5dw@1
* \40YGFO
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) &.N$
*/ r;m`9,RW
public void sort(int[] data) { p#@Z$gTH`'
int[] temp=new int[data.length]; O#_b7i
mergeSort(data,temp,0,data.length-1); Em^(
} Cifd21v4
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private void mergeSort(int[] data, int[] temp, int l, int r) { 8;" *6vHZ
int i, j, k; (^n*Am;zlH
int mid = (l + r) / 2; 51xk>_Hm}|
if (l == r) #T3h}=
return; :&w{\-0{
if ((mid - l) >= THRESHOLD) jbte
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mergeSort(data, temp, l, mid); n$["z
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else +j[oE I`e
insertSort(data, l, mid - l + 1); Z|*!y]We
if ((r - mid) > THRESHOLD) $_X|,v9
mergeSort(data, temp, mid + 1, r); 23ze/;6%A
else i7Z=|&
insertSort(data, mid + 1, r - mid); ]axh*J3`i
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for (i = l; i <= mid; i++) { ~?Omy8#
temp = data; <J{'o`{
} I+;-p]~
for (j = 1; j <= r - mid; j++) { L%cVykWY"
temp[r - j + 1] = data[j + mid]; f CcD&<%
} aT!;{+
int a = temp[l]; hOk00az
int b = temp[r]; "!UVs+)]
for (i = l, j = r, k = l; k <= r; k++) { R;}22s
if (a < b) { yR71%]*.
data[k] = temp[i++]; y,Q5;$w8
a = temp; AuiFbRFi
} else { K%j&/T j1
data[k] = temp[j--]; vO@s$qi
b = temp[j]; K_BPZ5w
} b~0N^p[&%
} r)T[(D'Tm-
} zO=%J)-=
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/** [=%YV# O
* @param data C>QIrZu
* @param l D'[Uc6
* @param i , c;eN
*/ \nvAa_,
private void insertSort(int[] data, int start, int len) { {]}s#vvy
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); @QEqB_W
} 0pgY1i7
} e}{U7xQm1
} $t=O:
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}