归并排序: 0281"aO
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package org.rut.util.algorithm.support; cczV}m2)
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import org.rut.util.algorithm.SortUtil; iR(jCD?) Y
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/** n~|sMpd,M1
* @author treeroot 01/yog
* @since 2006-2-2 _BP!{~&;
* @version 1.0 /6PL
*/ :]g>8sWL
public class MergeSort implements SortUtil.Sort{ Bp>Z?"hTe
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/* (non-Javadoc) z.%K5vrO>
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) ^a+H`RD
*/ sj& j\<(
public void sort(int[] data) { C`LHFqv
int[] temp=new int[data.length]; F.[E;gOTo
mergeSort(data,temp,0,data.length-1); q"O4}4`
} zEYT,l
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private void mergeSort(int[] data,int[] temp,int l,int r){ fce~a\y0
int mid=(l+r)/2; "fTW2D74
if(l==r) return ; AV%t<fDG#
mergeSort(data,temp,l,mid); /$NZj"#
mergeSort(data,temp,mid+1,r); u^Sa{Jk=
for(int i=l;i<=r;i++){ qe{:9
temp=data; |}Wm,J
} ./#F,^F2
int i1=l; "g=g' W#
int i2=mid+1; s}5,<|DL
for(int cur=l;cur<=r;cur++){ e0; KmQjG
if(i1==mid+1) SZ'2/#R>
data[cur]=temp[i2++]; c&AJFED]<
else if(i2>r) \2Atm,#4
data[cur]=temp[i1++]; v@^P4cu;
else if(temp[i1] data[cur]=temp[i1++]; ?f\ ~:Gm/
else "q,.O5q}Y
data[cur]=temp[i2++]; :G\X
} _)U[c;^6
} U&}v1wdZ3
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} 8n1<nS<
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改进后的归并排序: DN%b!K:
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package org.rut.util.algorithm.support; @W+m;4 HH
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import org.rut.util.algorithm.SortUtil; @P@j9yR
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/** aIXN wnq
* @author treeroot HJ]9e
* @since 2006-2-2 U6/$CH<pe
* @version 1.0 #o/
*/ #D2.RN
public class ImprovedMergeSort implements SortUtil.Sort { Y"dUxv1Ap
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private static final int THRESHOLD = 10; 4u.Fy<+@4M
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/* (0W)Jd[
* (non-Javadoc) 9yrSCDu00
* oZCjci-
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) xP61^*-2
*/ $9%UAqk9
public void sort(int[] data) { @cC@(M~Ru
int[] temp=new int[data.length]; 9H6%\#rw
mergeSort(data,temp,0,data.length-1); 6hX[5?}
} A`nw(f_/
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private void mergeSort(int[] data, int[] temp, int l, int r) { ~p* \|YC
int i, j, k; s=BJ7iU_68
int mid = (l + r) / 2; Y:-O/X
if (l == r) Q%Fa1h:2&
return; bnYd19>
if ((mid - l) >= THRESHOLD) LZ 3PQL
mergeSort(data, temp, l, mid); a58]#L~
else 5H!6#pqM
insertSort(data, l, mid - l + 1); LeTOVgjA|
if ((r - mid) > THRESHOLD) )U5Ba^"fI
mergeSort(data, temp, mid + 1, r); }JlrWJRi
else L $ki>._i\
insertSort(data, mid + 1, r - mid); d09qZj>
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for (i = l; i <= mid; i++) { &hco3HfW
temp = data; (aTpBXGr=
} n=8DC&
for (j = 1; j <= r - mid; j++) { XK=-$2n
temp[r - j + 1] = data[j + mid]; ,}jey72/k
} Rxfhk,I
int a = temp[l]; E-?@9!2
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int b = temp[r]; ~qu}<u)P
for (i = l, j = r, k = l; k <= r; k++) { /ho7O/aAa
if (a < b) { ;T,`m^@zf
data[k] = temp[i++]; A/A;'9
a = temp; +{dJGPoY]p
} else { T_NN.Ol
data[k] = temp[j--]; qvN`46c
b = temp[j]; T}r}uw`
} k0^t$J
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} P3op1/Np
} +F@ZVMp
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/** cI/Puh^3
* @param data r'E|6_0
* @param l mi&mQQ
* @param i f~-qjEWm
*/ .;,` bH0
private void insertSort(int[] data, int start, int len) { 2Cgq&\wS
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); \{K~x@`
} U6K!FOND
} 9tBE=L=
} (D~NW*,9
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}