归并排序: |^Z1 D TAw
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package org.rut.util.algorithm.support; %L{ H_;z
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import org.rut.util.algorithm.SortUtil; 'bkecC
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/** |,5b[Y"Dt
* @author treeroot 0X -u'=Bs
* @since 2006-2-2 er^z:1'
* @version 1.0 X",fp
*/ %WCA?W0:4
public class MergeSort implements SortUtil.Sort{ tuK"}HepB
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/* (non-Javadoc) +M
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) -c%GlpZw
*/ 52tIe|KwL
public void sort(int[] data) { f!*b8ND^R
int[] temp=new int[data.length]; 5SK{^hw
mergeSort(data,temp,0,data.length-1); ?};}#%971
} X}_}`wIn
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private void mergeSort(int[] data,int[] temp,int l,int r){ 31wact^
int mid=(l+r)/2; JTpKF_Za<
if(l==r) return ; B @UaaWh
mergeSort(data,temp,l,mid); 'rRo2oTN
mergeSort(data,temp,mid+1,r); O$Wt\Y<q
for(int i=l;i<=r;i++){ G!oq
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temp=data; YU[93@mCh
} 8[ 1D4d
int i1=l; a|32Pn
int i2=mid+1; Rs{L
for(int cur=l;cur<=r;cur++){ O qY8\>f-
if(i1==mid+1) gCgMmD=AZ
data[cur]=temp[i2++]; 18Vtk"j
else if(i2>r) >c\'4M8Cz
data[cur]=temp[i1++]; OAR1u}
else if(temp[i1] data[cur]=temp[i1++]; _+%-WFS|
else xg'z_W
data[cur]=temp[i2++]; ME1lQ7E4B
} iquB]z'
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改进后的归并排序: "}Ch2K
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package org.rut.util.algorithm.support; <dD}4c+/t
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import org.rut.util.algorithm.SortUtil; wQ*vcbQX*
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/** #DwTm~V0"
* @author treeroot cuBOE2vB.
* @since 2006-2-2 R"Hhc(H
* @version 1.0 WcPDPu~/
*/ ,JN2q]QPP
public class ImprovedMergeSort implements SortUtil.Sort { fg%I?ou
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private static final int THRESHOLD = 10; kW4/0PD
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/* z6B/H2
* (non-Javadoc) '[~NRKQJ
* utQE$0F
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) nE+sbfC
*/ 4!d&Zc>C4
public void sort(int[] data) { Q{UR3U'Q
int[] temp=new int[data.length]; Zb8Ty~.\P
mergeSort(data,temp,0,data.length-1); K!5QFO4
} *|Q'?ty(x
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private void mergeSort(int[] data, int[] temp, int l, int r) { ?a7PxD.
int i, j, k; jB:$+k|~.
int mid = (l + r) / 2; *&+e2itmp
if (l == r) 5iz]3]}%
return; IBcCbNs!
if ((mid - l) >= THRESHOLD) ~{0:`)2FQ
mergeSort(data, temp, l, mid); 4Ucg<Z&%
else g6IG>)
insertSort(data, l, mid - l + 1); '49&qO5B
if ((r - mid) > THRESHOLD) 7qA0bUee5
mergeSort(data, temp, mid + 1, r); nY'0*:'u
else 1<fS&)^W
insertSort(data, mid + 1, r - mid); y!6B Gz
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for (i = l; i <= mid; i++) { x:88E78
temp = data; 7;#9\a:R?
} {xW?v;
for (j = 1; j <= r - mid; j++) { Q$Ga.fI
temp[r - j + 1] = data[j + mid]; 7$<.I#x
} wXMKQ)$(
int a = temp[l]; KF|+#qCN
int b = temp[r]; >t)vQ&:;u
for (i = l, j = r, k = l; k <= r; k++) { U>IllNd
if (a < b) { !Sy._NE`z
data[k] = temp[i++]; _Buwz_[&
a = temp; P\tP0+at
} else { dD?1te
data[k] = temp[j--]; ';hU&D;s
b = temp[j]; lt|\$Iy(
} |o6
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}
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/** =\B{)z7@6D
* @param data 9
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* @param l D!h8NZ;El
* @param i B&Q\J>l9S
*/ !lKO|Y
private void insertSort(int[] data, int start, int len) { %2f``48#
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); R5g-b2Lm
} y{,HpPp#o
} "fdgBso
} jA$g0>
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}