归并排序: uU]4)Hp
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package org.rut.util.algorithm.support; r'q9N
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import org.rut.util.algorithm.SortUtil; )rs);Pl
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/** AcYL3
* @author treeroot v(t?d
* @since 2006-2-2 hQfxz,X
* @version 1.0 Q
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*/ $fY4amX6Z
public class MergeSort implements SortUtil.Sort{ rX#}2
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/* (non-Javadoc) LPk85E
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) d(L u|/~
*/ { LJRdV
public void sort(int[] data) { ZIx,?E+eJ
int[] temp=new int[data.length]; B jR:#*<qD
mergeSort(data,temp,0,data.length-1); pFg9-xd%
} Z\y@rp\l
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private void mergeSort(int[] data,int[] temp,int l,int r){ HBL)_c{/O
int mid=(l+r)/2; p'
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if(l==r) return ; Bk1Q.Un
mergeSort(data,temp,l,mid); .Go 3'$'v
mergeSort(data,temp,mid+1,r); 9)QvJ87e@7
for(int i=l;i<=r;i++){ V<@]Iv
temp=data; |:tFQ.Z'2
} h2Z Gh
int i1=l; iCIu]6
int i2=mid+1; zrt8ze=Su
for(int cur=l;cur<=r;cur++){ a-,BBM 8|
if(i1==mid+1) @"H+QVJ@
data[cur]=temp[i2++]; P~:W+!@5v
else if(i2>r) ht S5<+Y
data[cur]=temp[i1++]; m(8t |~S
else if(temp[i1] data[cur]=temp[i1++]; @fbB3
else H0s,tTK8
data[cur]=temp[i2++]; g!O(@Sqp1
} m4*Rr
} cV5Lp4wY?
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改进后的归并排序: xS,#TU;)Ol
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package org.rut.util.algorithm.support; @M"h_Z1#
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import org.rut.util.algorithm.SortUtil; Q<r O5 -K
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/** vGC^1AM
* @author treeroot #uT-_L}sw
* @since 2006-2-2 $_l@k=
* @version 1.0 0bpl3Fh.v
*/ Db=
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public class ImprovedMergeSort implements SortUtil.Sort { k"V3FXC)
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private static final int THRESHOLD = 10; >"S'R9t
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/* fdN-Zq@'
* (non-Javadoc) N@^?J@#V
* Z|
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* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) Ne.W-,X^cL
*/ A[ ZJS
public void sort(int[] data) { _#e='~;
int[] temp=new int[data.length]; bI=\n)sEz
mergeSort(data,temp,0,data.length-1); z1F[okLA
} S~}?6/G.
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private void mergeSort(int[] data, int[] temp, int l, int r) { OlFls 8#>
int i, j, k; kN;l@>
int mid = (l + r) / 2; *Rj>// A
if (l == r) (9$/r/-a
return; 8sg8gBt
if ((mid - l) >= THRESHOLD) .dV o[m;
mergeSort(data, temp, l, mid); QKbX^C
else )D@1V=9,
insertSort(data, l, mid - l + 1); BJk\p.BVN
if ((r - mid) > THRESHOLD) 6A/Nlk.
mergeSort(data, temp, mid + 1, r); Zcz)FP#
else xZL`<3?
insertSort(data, mid + 1, r - mid); HH2*12e
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for (i = l; i <= mid; i++) { SA{A E9y
temp = data; ZsUxO%jP
} :j
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for (j = 1; j <= r - mid; j++) { ?ae:9ZcH
temp[r - j + 1] = data[j + mid]; ZQnJTS+ Rd
} 2anx]QV4
int a = temp[l]; ?U2ed)zzw
int b = temp[r]; ^Y~ ,s
for (i = l, j = r, k = l; k <= r; k++) { =6q?XOM
if (a < b) { o'%F*>#v
data[k] = temp[i++]; C&3#'/&
a = temp; #*
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} else { )AqM?FE4R
data[k] = temp[j--]; OtF{=7
b = temp[j]; OsAXHjX}
} czb(&><
} QO7> XHn
} Yq#I#
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/** lVXgp'!#j
* @param data _jK\+Zf
* @param l U{LDtn%@h6
* @param i 9.lSF
*/ x-U:T.+{
private void insertSort(int[] data, int start, int len) { *
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for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 23y7l=.b/
} djPr 4Nog
} v(=fV/
} rc*&K#? B
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}