归并排序: /!?b&N/d)
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package org.rut.util.algorithm.support; !9.k%B:
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import org.rut.util.algorithm.SortUtil;
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/** E.%V0}
* @author treeroot b(oe^jeGz
* @since 2006-2-2 N5c*#lHI
* @version 1.0 4a0Ud !Qcs
*/ ~&?57Sw*m
public class MergeSort implements SortUtil.Sort{ 2vTO>*t
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/* (non-Javadoc) zo1T`"Y
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) inY_cn?
*/ 0W0GSDx
public void sort(int[] data) { D6~KLSKm
int[] temp=new int[data.length]; Wv|CJN;4
mergeSort(data,temp,0,data.length-1); LC4VlfU
} r?itd)WC<X
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private void mergeSort(int[] data,int[] temp,int l,int r){ _dELVs7OL
int mid=(l+r)/2; xax[#Vl4
if(l==r) return ; 3-btaG'P
mergeSort(data,temp,l,mid); +`bnQn]x+
mergeSort(data,temp,mid+1,r); v%$l(
for(int i=l;i<=r;i++){ ht*N[Pi4;
temp=data; wz1nV}
} &?@[bD'T
int i1=l; tm/=Oc1p
int i2=mid+1; :tBe/(e4#
for(int cur=l;cur<=r;cur++){ XHxJzYMc
if(i1==mid+1) ^vxx]Hji
data[cur]=temp[i2++]; ,,H;2xYf
else if(i2>r) F!3p )?
data[cur]=temp[i1++]; :pM)I5MN[
else if(temp[i1] data[cur]=temp[i1++]; WH4rZ }Z`
else @<3E`j'p
data[cur]=temp[i2++]; DXG`% <ZMn
} +m]-)
} '<3h8\"
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} whYk"N
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改进后的归并排序: 4qQE9fxdY
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package org.rut.util.algorithm.support; tmOy"mq67
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import org.rut.util.algorithm.SortUtil; Y(t/=3c[
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/** -. o,bg
* @author treeroot Rz&`L8Bz
* @since 2006-2-2 ia3Q1 9r
* @version 1.0 :1Nc6G
*/ etT9}RbQ
public class ImprovedMergeSort implements SortUtil.Sort { \?oT.z5VG&
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private static final int THRESHOLD = 10; w+"E{#N
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/* c0Bqm
* (non-Javadoc) wm^1Fn--
* }-sh
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) w,X)g{^T
*/ SHs [te[
public void sort(int[] data) {
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int[] temp=new int[data.length]; m_Pk$Vwx
mergeSort(data,temp,0,data.length-1); VQ,5&-9Y3
} qtdkK LT
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private void mergeSort(int[] data, int[] temp, int l, int r) { q6N{N>-D
int i, j, k; 1X2|jj
int mid = (l + r) / 2; FAL#p$y}
if (l == r) 2*^=)5Gj-h
return; B8eZ}9X
if ((mid - l) >= THRESHOLD) ZV:df 6S
mergeSort(data, temp, l, mid); ~"0{<mMcX
else .?rs5[th*
insertSort(data, l, mid - l + 1); oQrfrA&=M
if ((r - mid) > THRESHOLD) ]]_5_)"4
mergeSort(data, temp, mid + 1, r); 8G3 Z,8P4(
else 1) K<x
insertSort(data, mid + 1, r - mid); mhv6.W@
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for (i = l; i <= mid; i++) { jJw
temp = data; p[o]ouTcS
} jygUf|
for (j = 1; j <= r - mid; j++) { eI:x4K,#
temp[r - j + 1] = data[j + mid]; ]KEE+o
} Ky7.&6\n
int a = temp[l]; Q|P
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int b = temp[r]; 4W|cIcU
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for (i = l, j = r, k = l; k <= r; k++) { @{#'y4\>
if (a < b) { P=1Ku|k
data[k] = temp[i++]; WY QVe_<z:
a = temp; iDX<`)
} else { 50|nQ:u,
data[k] = temp[j--]; (tq);m&
b = temp[j]; |=v,^uo
} %]Nm'"Y`U
} (^W
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} ;hODzfNkS
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/** ygV_"=+|N
* @param data pGD-K41O]
* @param l $[b}r#P
* @param i f+ZOE?"
*/ +zbCYA
private void insertSort(int[] data, int start, int len) { :R
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for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); n 7B2rRJH
} -(e=S^36
} ^wc:qll
} @=Pc{xp
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}