归并排序: >$SP2(Y~
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package org.rut.util.algorithm.support; 1^XuH('
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import org.rut.util.algorithm.SortUtil; d0Xb?-
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/** _;(`u!@/{
* @author treeroot ]Q,;5>#W
* @since 2006-2-2 Ls{z5*<FM
* @version 1.0 b&[9m\AX`
*/ aSdh5?
public class MergeSort implements SortUtil.Sort{ psyxNM=dN#
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/* (non-Javadoc) IhnHNY]<g
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) LOQoi8j
*/ ~,+n_KST;
public void sort(int[] data) { j[l6&eX
int[] temp=new int[data.length]; Z?X0:WK
mergeSort(data,temp,0,data.length-1); Mx{VN
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} o|Cq#JFG
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private void mergeSort(int[] data,int[] temp,int l,int r){ =sy>_
int mid=(l+r)/2; q9cmtZrm
if(l==r) return ; U"$Q$ OFs
mergeSort(data,temp,l,mid); Ck;O59A"&-
mergeSort(data,temp,mid+1,r); 7?Q@Hj(:NT
for(int i=l;i<=r;i++){ BC*vG=a
temp=data; _nu,ks+
} Tlrr02>B{
int i1=l; D FDC'E
int i2=mid+1; ^,u0kMG5l
for(int cur=l;cur<=r;cur++){ |T?wM/
if(i1==mid+1) sq TBlP
data[cur]=temp[i2++]; ,K9\;{C
else if(i2>r) 3D_Ky Z~M+
data[cur]=temp[i1++]; KilgeN:
else if(temp[i1] data[cur]=temp[i1++]; CvfXm
else zvjVM"=G
data[cur]=temp[i2++]; X8~dFjhX
} *uHL'Pe;m
} uo0g51%9
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} -YM#.lQ
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改进后的归并排序: ?xEQ'(UBQ
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package org.rut.util.algorithm.support; (Mi]vK.4
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import org.rut.util.algorithm.SortUtil; Y<|!)JLB2
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/** )006\W|t9
* @author treeroot 1Vq]4_09g1
* @since 2006-2-2 ! |SPOk
* @version 1.0 3jF#f'*
*/ b`"E(S /
public class ImprovedMergeSort implements SortUtil.Sort { Ci%u =%(
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private static final int THRESHOLD = 10; &:}e`u@5|
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/* }OY]mAv-B
* (non-Javadoc) H.-jBFt}
* dxqVZksg(9
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) @X`~r8&
*/ b3(pRg[Fp
public void sort(int[] data) { i9Fg
int[] temp=new int[data.length]; ~\= VSwJ
mergeSort(data,temp,0,data.length-1); E)==!T@E
} LhM{LUi
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private void mergeSort(int[] data, int[] temp, int l, int r) { `nBCCz'Y!
int i, j, k; nQ|4.e;
int mid = (l + r) / 2; zNSix!F
if (l == r) iVq4&X_x
return; ").MU[q%Y
if ((mid - l) >= THRESHOLD) .d<
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mergeSort(data, temp, l, mid); <viIpz2jh%
else u@|izRk
insertSort(data, l, mid - l + 1); aE}1~`
if ((r - mid) > THRESHOLD) ;>^oe:@
mergeSort(data, temp, mid + 1, r); iku8T*&uc
else _XT],"
insertSort(data, mid + 1, r - mid); JA W}]:jC
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for (i = l; i <= mid; i++) { 4d&#NP
temp = data; o(xRq;i
} #_yQv? J
for (j = 1; j <= r - mid; j++) { _\E{T5
temp[r - j + 1] = data[j + mid]; Gvo(iOU
} @$FE}j_
int a = temp[l]; (]7*Kq
int b = temp[r]; 3wXmX
for (i = l, j = r, k = l; k <= r; k++) { =H*}{'#
if (a < b) { shW$V93<
data[k] = temp[i++]; U3r[ysf
a = temp; ( Lj{V}^
} else { \)'nxFKqV
data[k] = temp[j--]; >cwyb9;!kK
b = temp[j]; b *IJ +
} B{|g+c%
} ,4y'(DA
}
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/** \RN,i]c-g/
* @param data -_=0PW5{
* @param l MLg<YL
* @param i pT]M]/y/:
*/ &pwSd
private void insertSort(int[] data, int start, int len) { #!p=P<4M
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 6cof Zc$
} s
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} {#q']YDe`
} y e!Bfz>
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}