归并排序: y>cLG5v
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package org.rut.util.algorithm.support; UOyM=#ipY
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import org.rut.util.algorithm.SortUtil; 51-'*Y
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/** 5"ooam3
* @author treeroot y&/bp<Z
* @since 2006-2-2 MnlD87x@X
* @version 1.0 b~2LD3"3
*/ 6z]y
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public class MergeSort implements SortUtil.Sort{ WD1>{TSn
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/* (non-Javadoc) B4* uS (
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 0oZZLi
*/ z4(`>z2a
public void sort(int[] data) { 2O- 4x
int[] temp=new int[data.length]; {0%
mergeSort(data,temp,0,data.length-1); q/Zs]Gz
} nzZs2
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private void mergeSort(int[] data,int[] temp,int l,int r){ UXh%DOq
int mid=(l+r)/2; B6@q`Bmw.
if(l==r) return ; VK!HuO9l
mergeSort(data,temp,l,mid); $)~ :H-
mergeSort(data,temp,mid+1,r); ,&
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temp=data; 9Vl}f^Gn
} {|@}xrB
int i1=l; x3sX=jIW_
int i2=mid+1; wR,}#m,
for(int cur=l;cur<=r;cur++){ ' 6)Yf}I
if(i1==mid+1) O{\%{XrW
data[cur]=temp[i2++]; FzykC
else if(i2>r) /ZM
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data[cur]=temp[i1++]; _.E{>IFw
else if(temp[i1] data[cur]=temp[i1++]; AxeQv'e
else 6"NtVfui
data[cur]=temp[i2++]; )~gIJW
} eeBW~_W
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改进后的归并排序: ~0[(-4MA
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215
package org.rut.util.algorithm.support; p+5J
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import org.rut.util.algorithm.SortUtil; p2< 927z
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/** hk$I-
* @author treeroot O hRf&5u$
* @since 2006-2-2 JH u>\{ 8V
* @version 1.0 _s<s14+od
*/ a47e
public class ImprovedMergeSort implements SortUtil.Sort { 'nq~1 >i
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private static final int THRESHOLD = 10; i8p$wf"aW
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/* p1hF.
* (non-Javadoc) =qbN?a/?2
* VFMn"bYOB
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 'p78^4'PL
*/ X&h?1lMJ /
public void sort(int[] data) { PVIZ
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int[] temp=new int[data.length]; q[+h ~)
mergeSort(data,temp,0,data.length-1); )wXE\$
} ti$60Up
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private void mergeSort(int[] data, int[] temp, int l, int r) { .C&kWM&j
int i, j, k; <lNNT6[/r
int mid = (l + r) / 2; $|7=$~y
if (l == r) ]Yf^O @<<>
return; cMCM>*X
if ((mid - l) >= THRESHOLD) *&\6x}.I4
mergeSort(data, temp, l, mid); cr|]\
else Jw#7b[a
insertSort(data, l, mid - l + 1); ,0ilNi>
if ((r - mid) > THRESHOLD) &5.J y2hO]
mergeSort(data, temp, mid + 1, r); Jt#HbAY
else +0j{$MPZ
insertSort(data, mid + 1, r - mid); Zy.A9Bh~
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for (i = l; i <= mid; i++) { wt;`_}g
temp = data; p Q!lY
} N=7iQ@{1
for (j = 1; j <= r - mid; j++) { 8 R7w$3pp\
temp[r - j + 1] = data[j + mid]; , s otZT
} 7h0u7 N
int a = temp[l]; q@~{g[
int b = temp[r]; ^Sj;~
for (i = l, j = r, k = l; k <= r; k++) { 4 P=1)t?tX
if (a < b) { ,G-
data[k] = temp[i++]; Qa\,)<'D:
a = temp; )_n(u3'
} else { wnK6jMjkSf
data[k] = temp[j--]; 9+$IulOvk
b = temp[j]; p|NY.N
} H+-x.l`
} GN
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} ~7PiIky.
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/** sa _J6~
* @param data PkZ1Db
* @param l U$y wO4.
* @param i T8)X?>CIW
*/ ]~VuY:abH
private void insertSort(int[] data, int start, int len) { -QR]BD%J*[
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); Qx3eEt@X5]
} !`4ie
} 1RX-`"^+
} ,3c25.,*
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}