归并排序: 5=Di<! a;
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package org.rut.util.algorithm.support; 8|" XSN
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import org.rut.util.algorithm.SortUtil; v-PXZ'7~
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/** xftBSdVE
* @author treeroot |6$p;Aar
* @since 2006-2-2 O)jWZOVp >
* @version 1.0 lR(+tj)9uO
*/ 3de_V|%
public class MergeSort implements SortUtil.Sort{ H XmS|PX
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/* (non-Javadoc) 'L8'
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 3J5!oF{H
*/ /\hzb/
public void sort(int[] data) { vMm1Z5S/
int[] temp=new int[data.length]; H(Z88.OM
mergeSort(data,temp,0,data.length-1); smnSDS
} tfGHea)M
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private void mergeSort(int[] data,int[] temp,int l,int r){ wf:OK[r9
int mid=(l+r)/2; eb =D/
if(l==r) return ; t$De/Uq
mergeSort(data,temp,l,mid); pNKhc#-w
mergeSort(data,temp,mid+1,r); Ac<Phy-J
for(int i=l;i<=r;i++){ [_Qa9e
temp=data; 8]U{;|';
} D>LZP!
int i1=l; * iF]n2g:
int i2=mid+1; rl#p".4q
for(int cur=l;cur<=r;cur++){ HlH64w2^R
if(i1==mid+1) L:i-BI`J
data[cur]=temp[i2++]; <psZQdH
else if(i2>r) :R~MO&
data[cur]=temp[i1++]; 70eb]\%
else if(temp[i1] data[cur]=temp[i1++]; ~,i-8jl,
else LILQ\I<<'
data[cur]=temp[i2++]; `|ASx8_!
} yge,8i)c
} !;KCU^9
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} [O?z@)dx
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改进后的归并排序: i}B2R$Z3
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package org.rut.util.algorithm.support; HBu[gh;b
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import org.rut.util.algorithm.SortUtil; V;,{}
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/** K|:@Z
* @author treeroot gk0( ANx
* @since 2006-2-2 x7eQ2h6O
* @version 1.0 kNobl
*/ Cd>WUw
public class ImprovedMergeSort implements SortUtil.Sort {
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private static final int THRESHOLD = 10; R]RZq+2^
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/* 6er-{.L=
* (non-Javadoc) =9fajRFTt
* 7Z-O_h3;)@
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 8j=}u/T@F
*/ $**r(HV
public void sort(int[] data) { d ysC4DS
int[] temp=new int[data.length]; B#.L
mergeSort(data,temp,0,data.length-1); b"vv>Q~U
} 3tZ]4ms}
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private void mergeSort(int[] data, int[] temp, int l, int r) { '8{Ne!y
int i, j, k; >VN5`Zlw\C
int mid = (l + r) / 2; S|]X'f
if (l == r) vM*($qpAy
return; h3z{(-~y
if ((mid - l) >= THRESHOLD) j]aoR
mergeSort(data, temp, l, mid); lna}@]oR
else enSXP~9w
insertSort(data, l, mid - l + 1); :$m}UA-9
if ((r - mid) > THRESHOLD) o!{w"K
mergeSort(data, temp, mid + 1, r); o .qf _A
else S'_-G;g.
insertSort(data, mid + 1, r - mid); 2IKnhBSV3
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for (i = l; i <= mid; i++) { A<qTg`gA
temp = data; CB/D4j;
} p4-o/8rO
for (j = 1; j <= r - mid; j++) { q(.:9A*0
temp[r - j + 1] = data[j + mid]; |>tKq;/
} OG~6L4"
int a = temp[l]; %|oJ>+
int b = temp[r]; z2QP)150
for (i = l, j = r, k = l; k <= r; k++) { Vc2A
if (a < b) { [ji#U s:h
data[k] = temp[i++]; lMg+R<$~I
a = temp; Zy(W^~NT
} else { Qg[/%$x.
data[k] = temp[j--]; _PlKhv}
b = temp[j]; Z3&_
} 7[5.> h
} 2|}+T6_q
} b+&%1C
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/** )XzI
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* @param data I^8"{J.Q)[
* @param l zN"J}r:
* @param i kT'u1q$3Vo
*/ =yyp?WmC8
private void insertSort(int[] data, int start, int len) { MgNU``
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); I$0)Px%z
} K3x.RQQ-
} lo,$-bJ,<,
} 6DuEL=C
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}