归并排序: )tyhf(p6
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package org.rut.util.algorithm.support; $NtbI:e{
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import org.rut.util.algorithm.SortUtil; +5+?)8Ls
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/** 2& l~8,
* @author treeroot hs"=>(P)
* @since 2006-2-2 "NamP\hj
* @version 1.0 hkq[xgX
*/ ZsPT!l,
public class MergeSort implements SortUtil.Sort{ t:G67^<3
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/* (non-Javadoc) ,:QzF"MV
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) 'bXm,Ed
*/ 1c}
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public void sort(int[] data) { A%pBvULH
int[] temp=new int[data.length]; #X(KW&;m
mergeSort(data,temp,0,data.length-1); .;0?r9
} Ol~jq;75
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private void mergeSort(int[] data,int[] temp,int l,int r){ AVys`{*c
int mid=(l+r)/2; $i+
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if(l==r) return ; ni@N/Z?!pA
mergeSort(data,temp,l,mid); }0P5~]S<5A
mergeSort(data,temp,mid+1,r); i<*{Z~B
for(int i=l;i<=r;i++){ aAr gKM f
temp=data; v/E_A3Ay&
} ;9r `P_r
int i1=l; 2%'iTXF
int i2=mid+1; 0OndSa,
for(int cur=l;cur<=r;cur++){ <4{,u1!t
if(i1==mid+1) L"akV,w4p
data[cur]=temp[i2++]; t@TBx=16
else if(i2>r) '@ym-\,
data[cur]=temp[i1++]; w7?&eF(w(
else if(temp[i1] data[cur]=temp[i1++]; Ls#=R
else ]iyJ>fC
data[cur]=temp[i2++]; ESl-k2
} G02(dj
} |[tlR`A $
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改进后的归并排序: 6p
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package org.rut.util.algorithm.support; <303PPX^6
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import org.rut.util.algorithm.SortUtil; ,{ C
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/** Efm37Kv5l
* @author treeroot Q3M;'m
* @since 2006-2-2 J2BW>T!tuw
* @version 1.0 MjAF&bD^
*/ 06 kjJ4
public class ImprovedMergeSort implements SortUtil.Sort { `[<j5(T
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private static final int THRESHOLD = 10; ckXJ9>
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/* L {6y]t7^
* (non-Javadoc) xHv<pza:
* 'J (4arN
* @see org.rut.util.algorithm.SortUtil.Sort#sort(int[]) sD,[,6(
*/ ;~Ke5os=s
public void sort(int[] data) { *<yKT$(+_
int[] temp=new int[data.length]; mX)UoiXue
mergeSort(data,temp,0,data.length-1); ef\Pu\'U
} /;t42
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private void mergeSort(int[] data, int[] temp, int l, int r) { \dAh^B K1(
int i, j, k; )&"l3*x
int mid = (l + r) / 2; K<O1PrC
if (l == r) :"9 :J
return; OTA @4~{C
if ((mid - l) >= THRESHOLD) 2jTP
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mergeSort(data, temp, l, mid); ]VifDFL}
else qNP&f8fH
insertSort(data, l, mid - l + 1);
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if ((r - mid) > THRESHOLD) @'.(62v
mergeSort(data, temp, mid + 1, r); M^\#(0^2@
else v,N*vqWS
insertSort(data, mid + 1, r - mid); .z
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for (i = l; i <= mid; i++) { j$ h.V#1z
temp = data; sT"U}
} .]+oE$,!
for (j = 1; j <= r - mid; j++) { Y%v?ROql
temp[r - j + 1] = data[j + mid]; `)`J
} zkXG%I4h
int a = temp[l]; opQ%!["N
int b = temp[r]; sgdxr!1?y
for (i = l, j = r, k = l; k <= r; k++) { uV r6tb1
if (a < b) { .0l0*~[
data[k] = temp[i++]; >t|u 8/P
a = temp; =.9L/74@
} else { Xqt3p6
data[k] = temp[j--]; uXiAN#1
b = temp[j]; <StyO[
} G992{B
} Y27x;U
} {AbQaw
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/** qJ=4HlLno
* @param data :- B,Q3d
* @param l 0oI3Fb;E
* @param i 0FrmZ$
*/ /3F4t
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private void insertSort(int[] data, int start, int len) { Az29?|e
for(int i=start+1;i for(int j=i;(j>start) && data[j] SortUtil.swap(data,j,j-1); 5?+ECxPt
} /; ;_l2 t
} xS%Z
} T^3_d93}d
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}