归并排序: ;CO qu#(
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package org.rut.util.algorithm.support; D;sG9Hky
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import org.rut.util.algorithm.SortUtil; 4KH'S'eR
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/** '`8 ^P
* @author treeroot Q g/Rw4[
* @since 2006-2-2 gj|5"'g%
* @version 1.0 B4 bB`r
*/ (XK,g;RoEn
public class MergeSort implements SortUtil.Sort{ w,hm_aDq
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/* (non-Javadoc) ?;#Q3Y+
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) `yR/M"u6T
*/ bAlty}U
public void sort(int[] data) { HOi~eX1d
int[] temp=new int[data.length]; k;qS1[a
mergeSort(data,temp,0,data.length-1); CG uuadNI
} ll__A|JQ
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private void mergeSort(int[] data,int[] temp,int l,int r){ m{oe|UVcmr
int mid=(l+r)/2; CUDA<Fm
if(l==r) return ; q:_:E*o
mergeSort(data,temp,l,mid); Aa-5k3:x]=
mergeSort(data,temp,mid+1,r); jd]L}%ax
for(int i=l;i<=r;i++){ v:lkvMq|=
temp=data; ",apO
} A":=-$)
int i1=l; 7<LuL
int i2=mid+1; YM#'+wl}`
for(int cur=l;cur<=r;cur++){ "s@Hg1
if(i1==mid+1) pZ Uy (
data[cur]=temp[i2++]; Fs>MFj
else if(i2>r) 23|JgKuA
data[cur]=temp[i1++]; L1_O!EQ
else if(temp[i1] data[cur]=temp[i1++]; aj|3(2;Kp
else ll}_EUF|
data[cur]=temp[i2++]; 5]mH.{$x$?
} e@c8Ce|0
} $c*fbBM(&n
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改进后的归并排序: MoxWnJy}
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package org.rut.util.algorithm.support; #0)TS
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import org.rut.util.algorithm.SortUtil; /#5rt&q
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/** hxdjmc-
* @author treeroot kM-8%a2i
* @since 2006-2-2 ^WU[+H ;
* @version 1.0 R;,5LS&*a
*/ 5X8 i=M;
public class ImprovedMergeSort implements SortUtil.Sort { zvN7aG
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private static final int THRESHOLD = 10; Sj)?!
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/* wg_Z@iX
* (non-Javadoc) *56j'FX
* J_a2DM6d
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 51%Rk,/o
*/ *s, bz.[
public void sort(int[] data) { Jj%xLv%
int[] temp=new int[data.length]; F.(W`H*1+
mergeSort(data,temp,0,data.length-1); QlVj#Jv;~
} m,+E5^
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private void mergeSort(int[] data, int[] temp, int l, int r) { },<Y
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int i, j, k; r}Vr_
int mid = (l + r) / 2; dm[JDVv|
if (l == r) {Mo[C%
return; uJ|,-"~F
if ((mid - l) >= THRESHOLD) CVY-U|xFY
mergeSort(data, temp, l, mid); ?gu!P:lZS
else GQ85ykky
insertSort(data, l, mid - l + 1); EId>%0s5
if ((r - mid) > THRESHOLD) Y q/vym-O5
mergeSort(data, temp, mid + 1, r); >q')%j
else fLRx{Nu
insertSort(data, mid + 1, r - mid); X'.lh#&
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for (i = l; i <= mid; i++) { ']Czn._
temp = data; m[l&&(+J,
} zn'Mi:O'p
for (j = 1; j <= r - mid; j++) { '?90e4x3/
temp[r - j + 1] = data[j + mid]; y)fz\wk
} uR=*q a
int a = temp[l]; N f?\O@
int b = temp[r]; 2/ )~$0
for (i = l, j = r, k = l; k <= r; k++) { {y|.y~vW
if (a < b) { f% 8n?f3;u
data[k] = temp[i++]; Dd
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a = temp; J;V#a=I
} else { 3Zz_wr6
data[k] = temp[j--]; sw$JY}Q8x
b = temp[j]; MB5V$toC
} >!PM5%G
} mE+=H]`.p
} PMiu "
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/** $v8T%'p+
* @param data 3]NKAPY
* @param l ]Gj%-5G
* @param i b;`MHEzw&q
*/ '[[IalQ?
private void insertSort(int[] data, int start, int len) { NUBzc'qb
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); zzC{I@b
} /^i_tLgb
} nbw8YO(=
} wd,6/5=lh
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}