归并排序: 8_Z"@
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package org.rut.util.algorithm.support; _q4Yq'dI
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import org.rut.util.algorithm.SortUtil; k(xB%>ns
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/** ZFtJoGaR
* @author treeroot vXZ
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* @since 2006-2-2 \O]kf>nC
* @version 1.0 Qb7&S5m
*/ Q9c*I,Oj
public class MergeSort implements SortUtil.Sort{ N/[!$B0H@
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/* (non-Javadoc) "MD6 <H
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) A@;{#.O
*/ e:K'e2
public void sort(int[] data) { 0$i\/W+
int[] temp=new int[data.length]; If8Lt}-
mergeSort(data,temp,0,data.length-1); ]z]=?;ty%
} \TLfLqA
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private void mergeSort(int[] data,int[] temp,int l,int r){ p q%inSY
int mid=(l+r)/2; mz<X$2]?
if(l==r) return ; Y-,S_59
mergeSort(data,temp,l,mid); :QF`Orb!^
mergeSort(data,temp,mid+1,r); KpIY>k
for(int i=l;i<=r;i++){ 0d$LUQ't
temp=data; h*Mt{A&'.&
} 3v&Shb?xb;
int i1=l; oFhBq0@
int i2=mid+1; aWNjl
for(int cur=l;cur<=r;cur++){ "([lkn
if(i1==mid+1) 3m~,6mQ
data[cur]=temp[i2++]; Q[FDk63;w
else if(i2>r) I+`>e*:@W
data[cur]=temp[i1++]; P
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else if(temp[i1] data[cur]=temp[i1++]; 2km0
else HdyE`FY \
data[cur]=temp[i2++]; C~^T=IP
} 8bf@<VTO_
} E&Zt<pRf;2
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} 8@){\.M
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改进后的归并排序:
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package org.rut.util.algorithm.support; 1@}<CWE9
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import org.rut.util.algorithm.SortUtil; HG)$W
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/** /`t}5U>S_
* @author treeroot 4sfq,shRq
* @since 2006-2-2 Pb1.X9*8c
* @version 1.0 EztuVe
*/ GnCs_[*&r
public class ImprovedMergeSort implements SortUtil.Sort { *^XMf
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private static final int THRESHOLD = 10; i>C%[dk9
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/* i2-]Xl
* (non-Javadoc) C' WX$!$d
* 3lKs>HE0
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) TH55@1W,[
*/ ~@e=+Z
public void sort(int[] data) { I,aaSBwt&2
int[] temp=new int[data.length]; I,"q:QS+
mergeSort(data,temp,0,data.length-1); ] VEc9?
} 4q?R 3\e;
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private void mergeSort(int[] data, int[] temp, int l, int r) { Xc&J.Tw#4*
int i, j, k; 'Tskx
int mid = (l + r) / 2; 3JD"* <zs
if (l == r) 9yu#G7
return; 'j?H>'t{
if ((mid - l) >= THRESHOLD) I0;gTpt9
mergeSort(data, temp, l, mid); zm_8{Rta}
else o)Px d
insertSort(data, l, mid - l + 1); R?dMM
if ((r - mid) > THRESHOLD) K,+z^{Hvh
mergeSort(data, temp, mid + 1, r); R%\<al$O
else ^f0-w`D
insertSort(data, mid + 1, r - mid); s=1 k9
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for (i = l; i <= mid; i++) { uz:r'+v
temp = data; Pj*]%V
} |h&okR+_,
for (j = 1; j <= r - mid; j++) { JUJrtKS
temp[r - j + 1] = data[j + mid]; 32pPeYxB!-
} bx Wzm|
int a = temp[l]; @RCZ![XYWg
int b = temp[r]; 1\AcceJ|(w
for (i = l, j = r, k = l; k <= r; k++) { _`Y%Y6O1/
if (a < b) { rT[b ^l}
data[k] = temp[i++]; =B`=f,,#3
a = temp; .Q{VY]B^
} else { uLfk>&hc
data[k] = temp[j--]; FuAs$;
b = temp[j]; K;`W4:,
} -zZb]8\E
} yNG|YB;
} 5 o[E8c8
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/** tVNFulcz$
* @param data ^* CKx
* @param l p
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* @param i Mp^G7JY,
*/ kX*.BZI}C
private void insertSort(int[] data, int start, int len) { !<F5W<V
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); +x?8\
} ];eJ'#
} d"a\`#
} 0Ag2zx
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}