归并排序: o9G%KO&;D,
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package org.rut.util.algorithm.support; $,q~ q^0
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import org.rut.util.algorithm.SortUtil; t
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/** ;hGC.}X
* @author treeroot \#.,@g
* @since 2006-2-2 r#iZ FL3q
* @version 1.0 tGnBx)J|
*/ 6s\niro2
public class MergeSort implements SortUtil.Sort{ 0UZ>y/
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/* (non-Javadoc) Gm;)Om_
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) occ^bq
*/ R06L4,/b
public void sort(int[] data) { m7wD#?lm
int[] temp=new int[data.length]; W[BZ/
mergeSort(data,temp,0,data.length-1); 1ael{b!
} [2?|BUtD[
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private void mergeSort(int[] data,int[] temp,int l,int r){ 73B,I 0U
int mid=(l+r)/2; b/'{6zn
if(l==r) return ; xF:
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mergeSort(data,temp,l,mid); !E!i`yF
mergeSort(data,temp,mid+1,r); '?dO[iQ$:
for(int i=l;i<=r;i++){ I
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temp=data; P'.MwS
} a5=8zO#%g
int i1=l; f =@'F=
int i2=mid+1; 1O@
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for(int cur=l;cur<=r;cur++){ 2g5i3C.q$
if(i1==mid+1) )3# gpM
data[cur]=temp[i2++]; }U3+xl6g
else if(i2>r) c} )U:?6
data[cur]=temp[i1++]; li'h&!|]
else if(temp[i1] data[cur]=temp[i1++]; lM1~K
else eKjmU | H
data[cur]=temp[i2++]; CXt9 5O?
} I?`}h}7.
} MB.\G.bV
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} Py*( %
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改进后的归并排序: -^sW{s0Rc
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package org.rut.util.algorithm.support; X`i'U7%I
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import org.rut.util.algorithm.SortUtil; YXCltME
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/** oSVo~F
* @author treeroot E;!pK9wL|
* @since 2006-2-2 |vW(;j6
* @version 1.0 GL;@heP
*/ 9V&}%
public class ImprovedMergeSort implements SortUtil.Sort { 58xaVOhb
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private static final int THRESHOLD = 10; j"(o>bv7
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/* _)|_KQQu
* (non-Javadoc) *+(t2!yFmE
* vHR-mQUs
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) >,c$e' h
*/ 'Cv,:Q
public void sort(int[] data) { vByt_X
int[] temp=new int[data.length]; q5
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mergeSort(data,temp,0,data.length-1); eC%uu
} #a1zk\R3
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private void mergeSort(int[] data, int[] temp, int l, int r) { ?%RAX CK
int i, j, k; A:|dY^,:?*
int mid = (l + r) / 2; 6Gt~tlt:L
if (l == r) bVfFhfh*
return; rP4v_?Zg+
if ((mid - l) >= THRESHOLD) wQ1_Q8 :Z
mergeSort(data, temp, l, mid); hxG=g6:G
else Xae0xs
insertSort(data, l, mid - l + 1); wVegr
if ((r - mid) > THRESHOLD) _#[~?g`
mergeSort(data, temp, mid + 1, r); ? :StFlie
else LDg"s0n#
insertSort(data, mid + 1, r - mid); 2_S%vA<L
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for (i = l; i <= mid; i++) { Z_b^K^4
temp = data; v[$-)vs*ag
} L'i0|_
for (j = 1; j <= r - mid; j++) { 3[q&%Z.
temp[r - j + 1] = data[j + mid]; #Z;6f{yWf
} ~kDR9s7
int a = temp[l]; ,m4M39MWJ
int b = temp[r]; +IS+!K0?)
for (i = l, j = r, k = l; k <= r; k++) { kg,t[Jl
if (a < b) { \.0cA4)[$
data[k] = temp[i++]; @ P:b\WCI
a = temp; ZtzSG@f
} else { u_kcuN\Sq
data[k] = temp[j--]; P:~Xaz\F
b = temp[j]; mT]+wi&
} !T+jb\O_
} ^pI&f{q
} 6snDv4
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/** ^oZz,q
* @param data :ik$@5wp
* @param l VV_Zrje
* @param i l ~bjNhk
*/ M<Gr~RKmAn
private void insertSort(int[] data, int start, int len) { 4Sj;38F
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for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); l7{]jKJue
} 8S8^sP
} #=}dv8
} gzHMZ/31
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}