归并排序: vWeY[>oGur
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package org.rut.util.algorithm.support; s9nPxC&A
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import org.rut.util.algorithm.SortUtil; '#LzQ6Pn
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/** )&>W/56/
* @author treeroot ~v pIy -
* @since 2006-2-2 (Ll'j0]k>
* @version 1.0 \({'Xo >(
*/ U1)Zh-aR
public class MergeSort implements SortUtil.Sort{ OM\1TD/-
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/* (non-Javadoc) {dpDQP +!
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) zN]%p>,)HB
*/ jTt9;?)
public void sort(int[] data) { a4 N f\7
int[] temp=new int[data.length]; a%b E}
mergeSort(data,temp,0,data.length-1); Rb:<?&7ZzN
} u|Mx}
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private void mergeSort(int[] data,int[] temp,int l,int r){ 0D@ $
int mid=(l+r)/2; v]F4o1ckk
if(l==r) return ; JVy|SA&R
mergeSort(data,temp,l,mid); $>O~7Nfst7
mergeSort(data,temp,mid+1,r); !R\FCAW[x
for(int i=l;i<=r;i++){ !f52JQyh
temp=data; 2 Kjd!~Z$
} 7G-?^
int i1=l; `{Q'iydU
int i2=mid+1; LAf#Rco4
for(int cur=l;cur<=r;cur++){ O=}Rp1
if(i1==mid+1) \-;f<%+
data[cur]=temp[i2++]; GVnDN~[
else if(i2>r) 3lpxh_
data[cur]=temp[i1++]; I(pq3_9$
else if(temp[i1] data[cur]=temp[i1++]; x@rQ7K>
else ,
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data[cur]=temp[i2++]; D0 p*Sg
} wv{ Qx^
} (iir,Ks2C
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} MAFdJ+n#
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改进后的归并排序: E;C{i
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package org.rut.util.algorithm.support; *qO)MpG{
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import org.rut.util.algorithm.SortUtil; =ejU(1 g
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/** Ri" hU/H{
* @author treeroot |JYb4J4Ni
* @since 2006-2-2 LiT%d
* @version 1.0 {P~rf&Ee
*/ d8jH?P-"
public class ImprovedMergeSort implements SortUtil.Sort { -9= DDoO
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private static final int THRESHOLD = 10; 9c)#j&2?H
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/* (wZ!OLY%}
* (non-Javadoc) qovsM M
* <YFDS;b|
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) U0j>u*yE
*/ NC-K`)
public void sort(int[] data) { _`\!+qGq
int[] temp=new int[data.length]; ,k4pW&A
mergeSort(data,temp,0,data.length-1); oxc;DfJ_
} =+j3E<w
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private void mergeSort(int[] data, int[] temp, int l, int r) { C-c'"FHq
int i, j, k; P1LOj
int mid = (l + r) / 2; {j>a_]dTVX
if (l == r) f- 9t
return; 2n@`Og_0
if ((mid - l) >= THRESHOLD) m-
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mergeSort(data, temp, l, mid); a&b/C*R_
else NLL"~
insertSort(data, l, mid - l + 1); r]p3DQ
if ((r - mid) > THRESHOLD) 8N'hG,
mergeSort(data, temp, mid + 1, r); QNMZR
else #4$YQ
insertSort(data, mid + 1, r - mid); raPOF6-_rH
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for (i = l; i <= mid; i++) { Zc~7R`v7}
temp = data; 8~C}0H
} }bS1M
for (j = 1; j <= r - mid; j++) { *GE6zGdN
temp[r - j + 1] = data[j + mid]; }UW*[dCf>C
} !s=$UC
int a = temp[l]; gE\ ^ vaB
int b = temp[r]; C
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for (i = l, j = r, k = l; k <= r; k++) { C][hH?.
if (a < b) { Y%"$v0D
data[k] = temp[i++]; bOr11?
a = temp; a`w=0]1&*
} else { 6J,h}S
data[k] = temp[j--]; apa&'%7
b = temp[j]; :Pdh##k
} I8J>>H'#A
} 2w7$"N
} 3O$l;|SX
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/** GE!nf6>Km
* @param data EZB0qZIp
* @param l L!Y|`P#Yr
* @param i Opu*i
*/ }NC$Ce
private void insertSort(int[] data, int start, int len) { ESV./~K
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); Pt5 wm\
} u?72]?SM
} K _VIk'RB
} ^R@)CIQ
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}